{"title":"Carriage Bolts","description":null,"products":[{"product_id":"a2-stainless-steel-carriage-bolts-flange-nuts-m3-m12","title":"Stainless Steel A2 Carriage Bolts with Flange Nuts — M3 to M12 Cup Square Coach Screws Set","description":"\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose the right bolt length for my project?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A general rule is to add the thickness of all materials being joined, then add approximately 1–1.5× the bolt diameter for thread engagement in the nut. For example, joining two 10mm boards with an M6 bolt typically calls for a 25mm or 30mm length. When in doubt, size up — you can always add a washer to take up slack.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does 'A2 stainless steel' mean and how strong is it?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A2 stainless steel (also called 304 stainless) is an austenitic grade that offers good corrosion resistance and a tensile strength typically around 500–700 MPa depending on the size and processing. It is suitable for most indoor and sheltered outdoor applications. For highly aggressive marine or chemical environments, A4 (316) stainless is generally recommended instead.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can these carriage bolts be used outdoors or in wet conditions?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. A2 stainless steel provides solid rust and corrosion resistance for most outdoor uses — decking, fencing, garden furniture, and pergolas are common applications. For direct saltwater or coastal exposure, A4 stainless is generally a better choice for long-term performance.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What thread standard do these bolts use — metric or imperial?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These are metric fasteners following the ISO\/DIN standard coarse-thread pitch (e.g., M6 = 1.0mm pitch, M8 = 1.25mm pitch). They are not compatible with UNC\/UNF imperial threads. Always confirm your existing hardware is metric before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is included in each set?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Each set includes one carriage bolt and one matching flange nut of the same size and grade. The flange nut's built-in washer face distributes load and eliminates the need for a separate flat washer in most applications. Quantity options of 1 set or 10 sets are available per variant.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will the square shank actually grip in wood or soft materials?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — the cup square (carriage bolt) design features a domed head and a square shank section directly beneath it. When driven into wood or a pre-drilled square hole, the shank bites into the material and prevents the bolt from spinning while you tighten the nut. This makes one-person installation practical in most woodworking and construction scenarios.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do I need a washer with the flange nut?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"In most cases, no. The flange nut has an integrated wide-diameter bearing face that acts like a built-in washer, spreading the clamping load over a larger surface area. However, for very soft materials or oversized holes, adding a flat washer under the flange nut can provide extra bearing surface.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I convert the bolt lengths to inches?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Divide the millimeter value by 25.4 to get inches. Quick reference: 25mm ≈ 1\\\", 50mm ≈ 2\\\", 75mm ≈ 3\\\", 100mm ≈ 4\\\". For example, an M8 × 40mm bolt is approximately M8 × 1-9\/16\\\".\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eA2 Stainless Steel Carriage Bolts with Flange Nuts — Secure, Rust-Resistant Fastening from M3 to M12\u003c\/h2\u003e\n    \u003cp\u003eWhether you're building a backyard deck, assembling outdoor furniture, or tackling a structural woodworking project, finding fasteners that won't rust, spin, or loosen over time is half the battle. Standard bolts require two wrenches and a separate washer; cheap zinc hardware corrodes within a season. These A2 stainless steel carriage bolts with flange nuts are designed for DIYers and tradespeople who need a clean, one-sided tightening solution that holds up to the elements.\u003c\/p\u003e\n    \u003cp\u003eEach set includes one cup square carriage bolt and one matching flange nut, both in A2 (304) stainless steel. The domed head and square shank beneath it grip the material to prevent spinning, while the flange nut's integrated bearing face eliminates the need for a separate flat washer. Sizes span M3 through M12 in diameter, with lengths ranging from 8mm (≈5\/16\") up to 120mm (≈4-3\/4\"), available in both single sets and 10-packs for larger jobs.\u003c\/p\u003e\n    \u003cp\u003eTypical applications include deck board fastening, pergola and fence rail assembly, garden bed framing, outdoor furniture construction, and light structural timber connections — anywhere you need a stainless carriage bolt that installs cleanly from one side without a backing wrench.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e\n    \u003cstrong\u003eThread Standard:\u003c\/strong\u003e Metric ISO coarse thread (DIN 603 carriage bolt profile) — M3, M4, M5, M6, M8, M10, M12. \u003cstrong\u003eNot compatible with UNC\/UNF imperial threads.\u003c\/strong\u003e Confirm your application uses metric hardware before ordering.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e✅ Key Features of These A2 Stainless Steel Carriage Bolts with Flange Nuts\u003c\/h2\u003e\n  \u003cul class=\"hdiy-features\"\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eA2 Stainless Steel Construction\u003c\/strong\u003e — Made from 304-grade stainless steel for solid corrosion resistance in outdoor, damp, and sheltered marine environments — no surface coating to chip or peel over time.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🔲\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eCup Square Anti-Spin Shank\u003c\/strong\u003e — The square neck under the domed head locks into wood or pre-drilled square holes, letting you tighten the nut single-handedly — a practical advantage for deck building and fence assembly.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eIntegrated Flange Nut Included\u003c\/strong\u003e — Each set pairs the bolt with a matching flange nut whose wide bearing face distributes clamping load evenly, reducing the risk of pull-through in softer wood without a separate washer.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eWide Size Range — M3 to M12\u003c\/strong\u003e — With diameters from M3 to M12 and lengths from 8mm to 120mm, one listing covers fastener needs across light cabinetry, structural timber framing, and everything in between.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eSingle Set or 10-Pack Options\u003c\/strong\u003e — Order a single set to replace a missing fastener or grab a 10-pack for larger builds — both options ship from our US warehouse for faster delivery.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🔗\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eDIN 603 Carriage Bolt Profile\u003c\/strong\u003e — Conforms to the widely recognized DIN 603 cup square bolt standard, ensuring dimensional compatibility with standard metric nuts, washers, and pre-drilled jigs used in woodworking and construction.\u003c\/span\u003e\n    \u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003cdiv class=\"hdiy-note\"\u003e\n    \u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e\n    \u003cstrong\u003eHeads up:\u003c\/strong\u003e These are metric fasteners. If your existing hardware uses SAE\/imperial sizing (e.g., 1\/4\"-20, 5\/16\"-18), please contact us to confirm compatibility before ordering.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e📐 Technical Specifications — A2 Stainless Steel Carriage Bolts \u0026amp; Flange Nuts\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eA2 Stainless Steel (304 grade)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBolt Head Type\u003c\/th\u003e\n\u003ctd\u003eDomed \/ Cup Square (Carriage Bolt, DIN 603)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eNut Type\u003c\/th\u003e\n\u003ctd\u003eFlange Nut (integrated washer face)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eMetric ISO coarse thread\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Diameters\u003c\/th\u003e\n\u003ctd\u003eM3, M4, M5, M6, M8, M10, M12\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e8mm (≈5\/16\") – 120mm (≈4-3\/4\"); see variant options for full range\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSet Contents\u003c\/th\u003e\n\u003ctd\u003e1× carriage bolt + 1× matching flange nut (per set)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eQuantity Options\u003c\/th\u003e\n\u003ctd\u003e1 Set \/ 10 Sets\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural stainless (no coating)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTensile Strength\u003c\/th\u003e\n\u003ctd\u003eTypically 500–700 MPa (varies by diameter; contact us to confirm)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCorrosion Resistance\u003c\/th\u003e\n\u003ctd\u003eSuitable for outdoor and damp environments; not recommended for direct saltwater immersion\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-faq\"\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right bolt length for my project?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA general rule is to add the thickness of all materials being joined, then add approximately 1–1.5× the bolt diameter for thread engagement in the nut. For example, joining two 10mm boards with an M6 bolt typically calls for a 25mm or 30mm length (20mm material + ~6–9mm thread). When in doubt, size up — you can always add a washer to take up slack. Length conversions: 25mm ≈ 1\", 50mm ≈ 2\", 75mm ≈ 3\", 100mm ≈ 4\".\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat does 'A2 stainless steel' mean and how strong is it?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA2 stainless steel (also called 304 stainless) is an austenitic grade that offers good corrosion resistance and a tensile strength typically around 500–700 MPa depending on size and processing. It handles most indoor and sheltered outdoor loads well. For highly aggressive marine or chemical environments, A4 (316) stainless is generally recommended for longer service life.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan these carriage bolts be used outdoors or in wet conditions?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eYes. A2 stainless steel provides solid rust and corrosion resistance for most outdoor uses — decking, fencing, garden furniture, and pergolas are common applications. For direct saltwater or coastal splash-zone exposure, A4 stainless is generally a better choice for long-term performance. Avoid prolonged contact with dissimilar metals (e.g., bare aluminum) to prevent galvanic corrosion.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat thread standard do these bolts use — are they metric or imperial?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese are metric fasteners following the ISO\/DIN coarse-thread pitch standard (e.g., M6 = 1.0mm pitch, M8 = 1.25mm pitch, M10 = 1.5mm pitch). They are \u003cstrong\u003enot\u003c\/strong\u003e compatible with UNC or UNF imperial threads. Always confirm your existing hardware is metric before ordering. If you're unsure, contact us with your application details.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is included in each set — do I need to buy a nut separately?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eEach set includes one carriage bolt and one matching flange nut of the same diameter and grade — no separate nut purchase needed. The flange nut's built-in washer face distributes load and eliminates the need for a separate flat washer in most applications. Choose 1 Set for single replacements or 10 Sets for larger builds.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill the square shank grip properly in wood without spinning?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eYes — the cup square (carriage bolt) design features a domed head and a square shank section directly beneath it. When driven into wood or a pre-drilled square hole, the shank bites into the material and prevents the bolt from rotating while you tighten the nut from the other side. This makes single-person installation practical for most woodworking and deck construction scenarios. For very hard materials, a square-punch or chisel can help seat the shank.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDo I need a separate washer with the flange nut?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eIn most cases, no. The flange nut has an integrated wide-diameter bearing face that acts like a built-in washer, spreading the clamping load over a larger surface area and reducing the chance of the nut pulling through softer wood. However, for very soft materials or oversized holes, adding a flat washer under the flange nut can provide extra bearing surface and is generally a good practice.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I convert these metric lengths to inches?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eDivide the millimeter value by 25.4 to get decimal inches. Quick reference chart:\u003c\/p\u003e\n        \u003cul class=\"hdiy-list\"\u003e\n          \u003cli\u003e8mm ≈ 5\/16\"\u003c\/li\u003e\n          \u003cli\u003e10mm ≈ 3\/8\"\u003c\/li\u003e\n          \u003cli\u003e16mm ≈ 5\/8\"\u003c\/li\u003e\n          \u003cli\u003e20mm ≈ 13\/16\"\u003c\/li\u003e\n          \u003cli\u003e25mm ≈ 1\"\u003c\/li\u003e\n          \u003cli\u003e30mm ≈ 1-3\/16\"\u003c\/li\u003e\n          \u003cli\u003e40mm ≈ 1-9\/16\"\u003c\/li\u003e\n          \u003cli\u003e50mm ≈ 2\"\u003c\/li\u003e\n          \u003cli\u003e75mm ≈ 3\"\u003c\/li\u003e\n          \u003cli\u003e100mm ≈ 4\"\u003c\/li\u003e\n          \u003cli\u003e120mm ≈ 4-3\/4\"\u003c\/li\u003e\n        \u003c\/ul\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your size and quantity above, then add to cart — ships from our US warehouse.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M3 \/ 8mm \/ 1 Set","offer_id":52308499235090,"sku":"GYZLLBRMSD2418x1","price":2.79,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 10mm \/ 1 Set","offer_id":52308499267858,"sku":"GYZLLBRMSD2419x1","price":2.79,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 12mm \/ 1 Set","offer_id":52308499300626,"sku":"GYZLLBRMSD2420x1","price":2.79,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 14mm \/ 1 Set","offer_id":52308499333394,"sku":"GYZLLBRMSD2421x1","price":2.79,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 16mm \/ 1 Set","offer_id":52308499366162,"sku":"GYZLLBRMSD2422x1","price":2.79,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 18mm \/ 1 Set","offer_id":52308499398930,"sku":"GYZLLBRMSD2423x1","price":2.79,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 20mm \/ 1 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Set","offer_id":52308504477970,"sku":"GYZLLBRMSD2487x10","price":27.4,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 40mm \/ 10 Set","offer_id":52308504510738,"sku":"GYZLLBRMSD2488x10","price":29.17,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 45mm \/ 10 Set","offer_id":52308504543506,"sku":"GYZLLBRMSD2489x10","price":30.94,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 50mm \/ 10 Set","offer_id":52308504576274,"sku":"GYZLLBRMSD2490x10","price":33.25,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 55mm \/ 10 Set","offer_id":52308504609042,"sku":"GYZLLBRMSD2491x10","price":35.75,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 60mm \/ 10 Set","offer_id":52308504641810,"sku":"GYZLLBRMSD2492x10","price":37.33,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 70mm \/ 10 Set","offer_id":52308504674578,"sku":"GYZLLBRMSD2493x10","price":41.6,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 80mm \/ 10 Set","offer_id":52308504707346,"sku":"GYZLLBRMSD2494x10","price":46.5,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 90mm \/ 10 Set","offer_id":52308504740114,"sku":"GYZLLBRMSD2495x10","price":51.26,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 100mm \/ 10 Set","offer_id":52308504772882,"sku":"GYZLLBRMSD2496x10","price":55.75,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 25mm \/ 10 Set","offer_id":52308504805650,"sku":"GYZLLBRMSD2497x10","price":38.07,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 30mm \/ 10 Set","offer_id":52308504838418,"sku":"GYZLLBRMSD2498x10","price":40.87,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 35mm \/ 10 Set","offer_id":52308504871186,"sku":"GYZLLBRMSD2499x10","price":42.83,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 40mm \/ 10 Set","offer_id":52308504903954,"sku":"GYZLLBRMSD2500x10","price":46.23,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 45mm \/ 10 Set","offer_id":52308504936722,"sku":"GYZLLBRMSD2501x10","price":49.63,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 50mm \/ 10 Set","offer_id":52308504969490,"sku":"GYZLLBRMSD2502x10","price":52.75,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 55mm \/ 10 Set","offer_id":52308505002258,"sku":"GYZLLBRMSD2503x10","price":56.02,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 60mm \/ 10 Set","offer_id":52308505035026,"sku":"GYZLLBRMSD2504x10","price":57.79,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 70mm \/ 10 Set","offer_id":52308505067794,"sku":"GYZLLBRMSD2505x10","price":64.94,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 80mm \/ 10 Set","offer_id":52308505100562,"sku":"GYZLLBRMSD2506x10","price":72.01,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 90mm \/ 10 Set","offer_id":52308505133330,"sku":"GYZLLBRMSD2507x10","price":76.69,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 100mm \/ 10 Set","offer_id":52308505166098,"sku":"GYZLLBRMSD2508x10","price":82.48,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/2_8_a0b800c6-69f7-48a9-b36d-a1cb8e0bb8fd.jpg?v=1780501986"},{"product_id":"m6-m8-stainless-steel-carriage-bolts-full-thread","title":"M6 M8 A2 304 Stainless Steel Carriage Bolts — Cup Square Coach Bolts, Full Thread, 12mm–60mm","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eM6 M8 Stainless Steel Carriage Bolts — Secure, Rust-Resistant Fastening for Outdoor \u0026amp; Structural Builds\u003c\/h2\u003e\n\u003cp\u003eWhether you're building a backyard deck, assembling a timber pergola, or reinforcing a fence panel, loose or corroded fasteners are the weak link that undoes hours of work. DIYers and contractors who work with wood-to-wood or wood-to-metal connections need a bolt that locks in place without spinning and holds up to the elements year after year — without constant maintenance.\u003c\/p\u003e\n\u003cp\u003eThese A2 304 stainless steel carriage bolts are available in M6 and M8 thread diameters, with lengths ranging from 12mm (≈1\/2\") to 60mm (≈2-3\/8\"), all in a full-thread configuration. Each bolt features the classic cup square (coach bolt) head profile — a smooth dome top with a square shank beneath — and is sold in packs of 2, 5, 10, or 25 pieces so you can order exactly what your project requires.\u003c\/p\u003e\n\u003cp\u003eTypical applications include outdoor decking and boardwalk construction, timber frame and pergola assembly, garden gate and fence panel hardware, and playground or furniture joinery where a flush, snag-free bolt head is needed on the visible face.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Standard ISO metric thread — M6 (pitch 1.0mm) \u0026amp; M8 (pitch 1.25mm). Fits any standard ISO metric hex nut, flange nut, or wing nut. \u003cstrong\u003eNot compatible with UNC\/UNF imperial threads.\u003c\/strong\u003e Pair with matching A2 stainless nuts and washers for a fully corrosion-resistant assembly.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-note\"\u003e\n\u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e \u003cstrong\u003eHeads up:\u003c\/strong\u003e Nuts and washers are \u003cstrong\u003enot included\u003c\/strong\u003e. Please confirm your hole diameter matches the bolt shank before ordering — M6 requires a 6mm clearance hole; M8 requires an 8mm clearance hole.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These Stainless Steel Carriage Bolts\u003c\/h2\u003e\n\u003cul class=\"hdiy-features\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e \u003cspan\u003e\u003cstrong\u003eA2 304 Stainless Steel Construction\u003c\/strong\u003e — Resists rust, oxidation, and atmospheric corrosion, making these carriage bolts a reliable choice for outdoor decking, fencing, and exposed structural connections.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔒\u003c\/span\u003e \u003cspan\u003e\u003cstrong\u003eAnti-Spin Cup Square Shank\u003c\/strong\u003e — The square section beneath the domed head locks into timber or pre-drilled holes, preventing rotation so you can tighten the nut with one hand — no need to hold the bolt head.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e \u003cspan\u003e\u003cstrong\u003eFull-Thread Shaft\u003c\/strong\u003e — Thread runs the full length of the shank, giving maximum grip across the entire bolt length — especially useful for thinner material stacks and wood-to-metal coach bolt applications.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e \u003cspan\u003e\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e — Available in packs of 2, 5, 10, or 25 pieces per size, so weekend DIYers and trade contractors alike can order the exact quantity needed without overstocking.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cspan\u003e\u003cstrong\u003eWide Size Range\u003c\/strong\u003e — M6 and M8 diameters in length options from 12mm (≈1\/2\") to 60mm (≈2-3\/8\") cover the most common timber joinery and structural fastening scenarios in a single listing.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e✨\u003c\/span\u003e \u003cspan\u003e\u003cstrong\u003eSmooth Dome Head Profile\u003c\/strong\u003e — The rounded cup head sits flush and snag-free on the visible face of your workpiece — ideal for furniture, play equipment, and any surface where a clean finish matters.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e📐 Technical Specifications — M6 M8 Stainless Steel Carriage Bolts\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eA2 304 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHead Type\u003c\/th\u003e\n\u003ctd\u003eCup Square (Dome \/ Coach Bolt Head)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDrive Type\u003c\/th\u003e\n\u003ctd\u003eNone (anti-spin square shank; wrench on nut only)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Type\u003c\/th\u003e\n\u003ctd\u003eFull Thread, ISO Metric Coarse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Diameters\u003c\/th\u003e\n\u003ctd\u003eM6 (6mm \/ ~1\/4\") · M8 (8mm \/ ~5\/16\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Pitch\u003c\/th\u003e\n\u003ctd\u003eM6: 1.0mm · M8: 1.25mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e12mm (≈1\/2\") · 16mm (≈5\/8\") · 20mm (≈3\/4\") · 25mm (≈1\") · 30mm (≈1-3\/16\") · 35mm (≈1-3\/8\") · 40mm (≈1-9\/16\") · 45mm (≈1-3\/4\") · 50mm (≈2\") · 55mm (≈2-3\/16\") · 60mm (≈2-3\/8\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantities\u003c\/th\u003e\n\u003ctd\u003e2 · 5 · 10 · 25 pieces\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eMill \/ Natural Stainless (no coating)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStandard\u003c\/th\u003e\n\u003ctd\u003eDIN 603 \/ ISO 8677 (Cup Square Carriage Bolt)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRecommended Clearance Hole\u003c\/th\u003e\n\u003ctd\u003eM6: 6.4mm · M8: 8.4mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Nut Standard\u003c\/th\u003e\n\u003ctd\u003eISO Metric Hex Nut (M6 or M8)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTensile Strength (typical)\u003c\/th\u003e\n\u003ctd\u003e500–700 MPa (A2-70 grade)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNuts \/ Washers Included\u003c\/th\u003e\n\u003ctd\u003eNot included — sold separately\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCountry of Warehouse\u003c\/th\u003e\n\u003ctd\u003eUnited States\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right length carriage bolt for my project?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAdd up the total thickness of all materials being joined, then add at least 10–15mm (roughly 3\/8\"–5\/8\") to accommodate the nut and any washer. For example, joining two 20mm (3\/4\") boards typically calls for a 50mm (2\") bolt. When in doubt, size up — a slightly longer bolt can be accommodated with an extra washer, while a bolt that's too short won't allow the nut to engage fully.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the shear and tensile strength of these carriage bolts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA2 304 stainless steel carriage bolts at A2-70 grade generally have a tensile strength of approximately 500–700 MPa. M6 bolts typically handle proof loads around 4.6 kN, while M8 bolts generally handle around 8.0 kN. For structural or load-bearing applications, always verify requirements with a qualified engineer and check your local building code.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these carriage bolts suitable for outdoor, decking, and marine use?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes — A2 304 stainless steel offers strong resistance to rust, oxidation, and most atmospheric corrosion, making these bolts well-suited for outdoor decking, fencing, pergolas, and garden structures. For highly aggressive marine or coastal environments with constant saltwater exposure, A4 316 stainless steel is generally recommended for maximum long-term corrosion resistance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat nut and thread standard are these bolts compatible with?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese bolts use the standard ISO metric coarse thread — M6 at 1.0mm pitch and M8 at 1.25mm pitch. They are compatible with any standard ISO metric hex nuts, flange nuts, or wing nuts of the corresponding size. They are \u003cstrong\u003enot\u003c\/strong\u003e compatible with UNC or UNF imperial-threaded nuts. For a fully corrosion-resistant assembly, pair with A2 stainless steel nuts and flat washers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is a carriage bolt and how is it different from a regular hex bolt?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA carriage bolt (also called a coach bolt or cup square bolt) has a smooth, domed head with a square shank section directly beneath it. When inserted into a pre-drilled hole, the square section bites into the material and prevents the bolt from spinning — so you only need a wrench on the nut side. This makes them ideal for wood-to-wood and wood-to-metal connections where one face must remain flush and snag-free, or where the bolt head side is inaccessible during tightening.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo I need a washer with these carriage bolts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eUsing a flat washer under the nut is generally recommended, especially in softer woods or composite decking materials, to distribute the clamping load and prevent the nut from pulling through the surface. The domed head side typically does not require a washer since it sits flush against the workpiece. Washers are sold separately — contact us if you need matching A2 stainless flat washers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these bolts with pressure-treated lumber?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. A2 304 stainless steel is generally compatible with modern ACQ (Alkaline Copper Quaternary) and CA (Copper Azole) pressure-treated lumber commonly used for decking and fencing. Older CCA-treated wood and some high-retention treatments can be more chemically aggressive; in those cases, A4 316 stainless steel is the safer long-term choice. Always check the lumber manufacturer's fastener compatibility recommendations for your specific treatment type and retention level.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your \u003cstrong\u003esize and length\u003c\/strong\u003e above, then add to cart — ships from our US warehouse.\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M6 \/ 12mm \/ 2PCS","offer_id":52308505952530,"sku":"A2661-0","price":6.19,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 12mm \/ 5PCS","offer_id":52308505985298,"sku":"A2661-1","price":6.73,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 12mm \/ 10PCS","offer_id":52308506018066,"sku":"A2661-2","price":8.83,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 12mm \/ 25PCS","offer_id":52308506050834,"sku":"A2661-3","price":18.89,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 16mm \/ 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\"name\": \"How do I choose the right bolt length for my project?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A general rule is to select a bolt length equal to the total thickness of the materials being joined plus at least 1–2 thread pitches beyond the nut. For example, joining two 15mm boards typically calls for a 35mm (≈1-3\/8\\u201d) bolt. Available lengths range from 25mm (≈1\\u201d) to 70mm (≈2-3\/4\\u201d).\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What tensile strength does A2-70 stainless steel provide?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A2-70 designates austenitic stainless steel with a minimum tensile strength of 700 MPa (≈101,500 psi). This is generally sufficient for structural wood connections, furniture assembly, and light-to-medium load-bearing applications.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these carriage bolts suitable for outdoor or marine use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. A2 stainless steel offers solid corrosion resistance in most outdoor environments including rain, humidity, and mild coastal exposure. For highly aggressive marine or saltwater environments, A4 (316) stainless is typically recommended instead.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What thread standard do these bolts use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These bolts use the M6 metric coarse thread (ISO 68-1 standard), with a standard pitch of 1.0mm. They are compatible with standard M6 hex nuts, nylon lock nuts, and M6 washers.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Why does a carriage bolt have a square neck instead of a hex head?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The square neck is designed to bite into wood or soft material as the nut is tightened, preventing the bolt from spinning. This allows one-person installation — no need to hold the bolt head with a wrench while tightening the nut.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Which pack size should I order?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"For small repairs or single-project use, a 25-piece box is generally sufficient. For deck building, fencing, or furniture production runs, the 40- or 50-piece boxes offer better value per bolt. All packs ship in a labeled storage box.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these bolts with pressure-treated lumber?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A2 stainless steel is generally compatible with ACQ and CA pressure-treated lumber, which can corrode standard zinc-plated hardware. Stainless steel is typically the recommended fastener material for treated wood in residential construction.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003c!-- ① OVERVIEW --\u003e\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eM6 Carriage Bolts in A2-70 Stainless Steel — Secure, Rust-Resistant Fastening for Wood \u0026amp; Outdoor Projects\u003c\/h2\u003e\n    \u003cp\u003eWhether you're building a backyard deck, assembling garden furniture, or reinforcing a fence post, loose or corroded fasteners can compromise the entire structure. These M6 carriage bolts in A2-70 stainless steel are engineered for DIYers, woodworkers, and contractors who need a reliable, corrosion-resistant connection without constant maintenance.\u003c\/p\u003e\n    \u003cp\u003eEach box contains M6 round head square neck coach screws in your chosen bolt length and pack quantity. The M6 thread diameter (6mm) follows the ISO metric coarse standard with a 1.0mm pitch. Bolt lengths range from 25mm (≈1\") to 70mm (≈2-3\/4\"), and packs are available in 25, 30, 40, or 50 pieces per labeled storage box — making it easy to stock exactly what your project requires.\u003c\/p\u003e\n    \u003cp\u003eTypical applications include deck and pergola construction using M6 stainless carriage bolts through timber, outdoor furniture assembly where weather resistance is critical, and fence rail connections where the self-locking square neck prevents bolt spin during single-handed installation.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- ② COMPATIBILITY BAR --\u003e\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e\n    \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Fits standard M6 hex nuts, nylon lock nuts, and M6 flat or spring washers (ISO metric). Thread pitch: 1.0mm coarse. Square neck seats into wood, plywood, and soft composites.\n  \u003c\/div\u003e\n\n  \u003c!-- ③ KEY FEATURES --\u003e\n  \u003ch2\u003e✅ Key Features of These M6 Stainless Steel Carriage Bolts\u003c\/h2\u003e\n  \u003cul class=\"hdiy-features\"\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eA2-70 Stainless Steel Construction\u003c\/strong\u003e — Meets ISO 3506 A2-70 with a minimum tensile strength of 700 MPa, providing dependable holding power for structural wood joints and outdoor assemblies.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🌧️\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eCorrosion-Resistant for Outdoor Use\u003c\/strong\u003e — Austenitic A2 stainless resists rust, oxidation, and staining in rain, humidity, and mild coastal conditions — ideal for deck fasteners and garden hardware.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🔒\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eSelf-Locking Square Neck Design\u003c\/strong\u003e — The square shoulder under the round head bites into wood grain as the nut is tightened, eliminating bolt spin and enabling one-person installation without a second wrench.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eSeven Length Options (25mm–70mm)\u003c\/strong\u003e — Choose from 25mm (≈1\"), 30mm (≈1-3\/16\"), 35mm (≈1-3\/8\"), 40mm (≈1-9\/16\"), 50mm (≈2\"), 60mm (≈2-3\/8\"), or 70mm (≈2-3\/4\") to match your exact material stack thickness.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eOrganized Storage Box Included\u003c\/strong\u003e — Each pack ships in a labeled box (25, 30, 40, or 50 pcs) so fasteners stay sorted on the job site and unused bolts are easy to store for future repairs.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🪵\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eCompatible with Pressure-Treated Lumber\u003c\/strong\u003e — A2 stainless steel resists the corrosive chemistry of ACQ and CA treated wood, making these coach screws a code-friendly choice for residential deck and fence construction.\u003c\/span\u003e\n    \u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003c!-- ④ TECHNICAL SPECIFICATIONS --\u003e\n  \u003ch2\u003e📐 Technical Specifications — M6 Round Head Square Neck Carriage Bolts\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Diameter\u003c\/th\u003e\n\u003ctd\u003eM6 (6mm \/ ≈0.236\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eISO Metric Coarse, Pitch 1.0mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Bolt Lengths\u003c\/th\u003e\n\u003ctd\u003e25mm (≈1\"), 30mm (≈1-3\/16\"), 35mm (≈1-3\/8\"), 40mm (≈1-9\/16\"), 50mm (≈2\"), 60mm (≈2-3\/8\"), 70mm (≈2-3\/4\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Type\u003c\/th\u003e\n\u003ctd\u003eRound Head (Dome) with Square Neck\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eDrive Type\u003c\/th\u003e\n\u003ctd\u003eNut-driven (no drive recess on head)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eA2 Austenitic Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eStrength Grade\u003c\/th\u003e\n\u003ctd\u003eA2-70 (Min. tensile strength 700 MPa)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eStandard\u003c\/th\u003e\n\u003ctd\u003eISO 3506 \/ DIN 603\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCompatible Nut\u003c\/th\u003e\n\u003ctd\u003eM6 Hex Nut, M6 Nylon Lock Nut\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCompatible Washer\u003c\/th\u003e\n\u003ctd\u003eM6 Flat Washer, M6 Spring Washer\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePack Quantity Options\u003c\/th\u003e\n\u003ctd\u003e25 pcs, 30 pcs, 40 pcs, 50 pcs (per box)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eMill finish stainless (no coating)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSquare Neck Size\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- ⑤ FAQ --\u003e\n  \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-faq\"\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right bolt length for my project?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA general rule is to select a bolt length equal to the total thickness of the materials being joined, plus at least 1–2 thread pitches beyond the nut face. For example, joining two 15mm boards typically calls for a 35mm (≈1-3\/8\") bolt. If you're adding a washer and nut, account for that extra 5–8mm. Available lengths run from 25mm (≈1\") to 70mm (≈2-3\/4\").\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat tensile strength does A2-70 stainless steel provide?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA2-70 designates austenitic stainless steel with a minimum tensile strength of 700 MPa (≈101,500 psi) per ISO 3506. This is generally sufficient for structural wood connections, outdoor furniture assembly, and light-to-medium load-bearing applications. For heavy structural steel connections, a higher grade may be required.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these carriage bolts suitable for outdoor or marine environments?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eYes. A2 stainless steel offers solid corrosion resistance in most outdoor environments including rain, humidity, and mild coastal exposure. For highly aggressive marine or saltwater immersion environments, A4 (316) stainless is typically recommended instead. These bolts are well-suited for decks, pergolas, fences, and garden furniture in standard outdoor conditions.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat thread standard do these bolts use, and what nuts are compatible?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese bolts use the M6 metric coarse thread (ISO 68-1), with a standard pitch of 1.0mm. They are compatible with any standard M6 hex nut, M6 nylon insert lock nut (Nyloc), and M6 flat or spring washers. They are \u003cem\u003enot\u003c\/em\u003e compatible with UNC\/UNF inch-standard nuts.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhy does a carriage bolt have a square neck instead of a hex head?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThe square neck is designed to embed into wood or soft composite material as the nut is tightened, preventing the bolt from rotating. This allows single-person installation — you can tighten the nut from one side without needing to hold the bolt head with a second tool. It also creates a cleaner, snag-free dome head on the visible face of the joint.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhich pack size should I order for my project?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eFor small repairs or single-use projects, a 25-piece box is generally sufficient. For deck building, fencing, or furniture production runs, the 40- or 50-piece boxes offer better value per bolt. All packs ship in a labeled storage box, making it easy to keep leftover fasteners organized for future use.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use these bolts with pressure-treated lumber?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eYes. A2 stainless steel is generally compatible with ACQ (Alkaline Copper Quaternary) and CA (Copper Azole) pressure-treated lumber, which can rapidly corrode standard zinc-plated or hot-dip galvanized hardware over time. Stainless steel fasteners are typically the recommended choice for treated wood in residential deck and fence construction per IRC guidelines.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003c!-- ⑥ CTA BAR --\u003e\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your \u003cstrong\u003ebolt length and pack quantity\u003c\/strong\u003e above, then add to cart — ships from our US warehouse.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M6 \/ 25mm \/ 50PCS","offer_id":52308509098258,"sku":"KAYFST029-1","price":11.72,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 30mm \/ 50PCS","offer_id":52308509131026,"sku":"KAYFST029-2","price":12.06,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 35mm \/ 50PCS","offer_id":52308509163794,"sku":"KAYFST029-3","price":12.58,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 40mm \/ 40PCS","offer_id":52308509196562,"sku":"KAYFST029-4","price":11.83,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 50mm \/ 30PCS","offer_id":52308509229330,"sku":"KAYFST029-5","price":11.79,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 60mm \/ 25PCS","offer_id":52308509262098,"sku":"KAYFST029-6","price":11.38,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 70mm \/ 25PCS","offer_id":52308509294866,"sku":"KAYFST029-7","price":12.4,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/P_008_dc38d347-6ea8-4001-a750-723fbd9e8e3f.jpg?v=1780502211"},{"product_id":"m8-carriage-bolts-a2-70-stainless-steel-coach-screws","title":"M8 Carriage Bolts A2-70 Stainless Steel | Round Head Square Neck Coach Screws","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"hdiy-desc\"\u003e\n\u003c!-- ① OVERVIEW --\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eM8 Carriage Bolts in A2-70 Stainless Steel — Reliable, Corrosion-Resistant Fastening for Heavy-Duty Wood Projects\u003c\/h2\u003e\n\u003cp\u003eWhen standard zinc-plated bolts rust out after a single season or strip under load, the whole joint fails — and so does your project. These M8 carriage bolts in A2-70 stainless steel are built for DIYers, woodworkers, and contractors who need a heavier-duty, corrosion-resistant fastener for timber framing, deck construction, and outdoor structural connections.\u003c\/p\u003e\n\u003cp\u003eEach box contains M8 round head square neck coach screws in your chosen bolt length and pack quantity. The M8 thread diameter (8mm \/ ≈5\/16\") follows the ISO metric coarse standard with a 1.25mm pitch. Bolt lengths range from 30mm (≈1-3\/16\") to 70mm (≈2-3\/4\"), and packs are available in 15, 20, 25, or 30 pieces per labeled storage box — sized to match everything from a quick repair to a full framing run.\u003c\/p\u003e\n\u003cp\u003eTypical applications include heavy timber deck framing where M8 stainless carriage bolts provide the clamping force needed across thick lumber, pergola and arbor assembly where weather resistance is non-negotiable, and fence post rail connections where the self-locking square neck eliminates bolt spin during single-handed tightening.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- ② COMPATIBILITY BAR --\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Fits standard M8 hex nuts, M8 nylon lock nuts, and M8 flat or spring washers (ISO metric). Thread pitch: 1.25mm coarse. Square neck seats into wood, plywood, and soft composites.\u003c\/div\u003e\n\u003c!-- ③ KEY FEATURES --\u003e\n\u003ch2\u003e✅ Key Features of These M8 Stainless Steel Carriage Bolts\u003c\/h2\u003e\n\u003cul class=\"hdiy-features\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e \u003cspan\u003e\u003cstrong\u003eA2-70 Stainless Steel Construction\u003c\/strong\u003e — Meets ISO 3506 A2-70 with a minimum tensile strength of 700 MPa, delivering dependable clamping force for structural timber joints and heavy outdoor assemblies.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🌧️\u003c\/span\u003e \u003cspan\u003e\u003cstrong\u003eRust-Resistant for Year-Round Outdoor Use\u003c\/strong\u003e — Austenitic A2 stainless resists oxidation, staining, and corrosion in rain, humidity, and mild coastal conditions — ideal for deck framing bolts and garden structure hardware.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔒\u003c\/span\u003e \u003cspan\u003e\u003cstrong\u003eSelf-Locking Square Neck Design\u003c\/strong\u003e — The square shoulder bites into wood grain as the nut is tightened, preventing bolt spin and enabling one-person installation without a backup wrench on the head.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e \u003cspan\u003e\u003cstrong\u003eFive Length Options (30mm–70mm)\u003c\/strong\u003e — Choose from 30mm (≈1-3\/16\"), 40mm (≈1-9\/16\"), 50mm (≈2\"), 60mm (≈2-3\/8\"), or 70mm (≈2-3\/4\") to match your exact material stack thickness without cutting or shimming.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e \u003cspan\u003e\u003cstrong\u003eOrganized Storage Box Included\u003c\/strong\u003e — Each pack ships in a labeled box (15, 20, 25, or 30 pcs) so fasteners stay sorted on the job site and unused bolts are easy to store for future repairs or follow-on phases.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e \u003cspan\u003e\u003cstrong\u003eCompatible with Pressure-Treated Lumber\u003c\/strong\u003e — A2 stainless resists the corrosive chemistry of ACQ and CA treated wood, making these M8 coach screws a code-friendly choice for residential deck and fence construction.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- ④ TECHNICAL SPECIFICATIONS --\u003e\n\u003ch2\u003e📐 Technical Specifications — M8 Round Head Square Neck Carriage Bolts\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Diameter\u003c\/th\u003e\n\u003ctd\u003eM8 (8mm \/ ≈5\/16\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eISO Metric Coarse, Pitch 1.25mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Bolt Lengths\u003c\/th\u003e\n\u003ctd\u003e30mm (≈1-3\/16\"), 40mm (≈1-9\/16\"), 50mm (≈2\"), 60mm (≈2-3\/8\"), 70mm (≈2-3\/4\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHead Type\u003c\/th\u003e\n\u003ctd\u003eRound Head (Dome) with Square Neck\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDrive Type\u003c\/th\u003e\n\u003ctd\u003eNut-driven (no drive recess on head)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eA2 Austenitic Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStrength Grade\u003c\/th\u003e\n\u003ctd\u003eA2-70 (Min. tensile strength 700 MPa)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStandard\u003c\/th\u003e\n\u003ctd\u003eISO 3506 \/ DIN 603\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Nut\u003c\/th\u003e\n\u003ctd\u003eM8 Hex Nut, M8 Nylon Lock Nut\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Washer\u003c\/th\u003e\n\u003ctd\u003eM8 Flat Washer, M8 Spring Washer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantity Options\u003c\/th\u003e\n\u003ctd\u003e15 pcs, 20 pcs, 25 pcs, 30 pcs (per box)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eMill finish stainless (no coating)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHead Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSquare Neck Size\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c!-- ⑤ FAQ --\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003cdetails open=\"\"\u003e\n\u003csummary\u003eHow do I choose the right M8 bolt length for my project?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA general rule is to select a bolt length equal to the combined thickness of all materials being joined, plus enough thread to fully engage the nut — typically 1–2 thread pitches beyond the nut face. For example, connecting two 20mm boards generally calls for a 50mm (≈2\") bolt when using a washer and nut. Available lengths run from 30mm (≈1-3\/16\") to 70mm (≈2-3\/4\").\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails open=\"\"\u003e\n\u003csummary\u003eWhat tensile strength does A2-70 stainless steel provide for M8 bolts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA2-70 per ISO 3506 specifies a minimum tensile strength of 700 MPa (≈101,500 psi). For M8 bolts, this translates to a proof load generally in the range of 16–18 kN, making them suitable for structural wood joints, outdoor furniture, and light-to-medium load-bearing connections. For critical structural steel applications, consult an engineer for load calculations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails open=\"\"\u003e\n\u003csummary\u003eAre these M8 carriage bolts suitable for outdoor or coastal environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. A2 austenitic stainless steel resists rust, oxidation, and staining in most outdoor conditions including rain, humidity, and mild coastal exposure. For direct saltwater immersion or highly aggressive marine environments, A4 (316) stainless is typically the recommended upgrade. These bolts are well-suited for decks, pergolas, fences, and garden structures in standard outdoor conditions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails open=\"\"\u003e\n\u003csummary\u003eWhat thread standard do these M8 bolts use, and what nuts are compatible?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese bolts use the M8 metric coarse thread (ISO 68-1) with a standard pitch of 1.25mm. They are compatible with standard M8 hex nuts, M8 nylon insert lock nuts (Nyloc), and M8 flat or spring washers. They are \u003cem\u003enot\u003c\/em\u003e compatible with UNC\/UNF inch-standard hardware.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails open=\"\"\u003e\n\u003csummary\u003eWhy does a carriage bolt have a square neck instead of a hex head?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe square shoulder under the round dome head is designed to embed into wood or soft composite as the nut is tightened, preventing the bolt from spinning. This allows single-person installation — you tighten the nut from one side without needing to hold the bolt head with a second tool. It also leaves a smooth, snag-free dome on the visible face of the joint.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails open=\"\"\u003e\n\u003csummary\u003eWhich pack size should I order for my project?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eFor small repairs or single-use projects, a 15-piece box is generally sufficient. For deck framing, pergola construction, or fence post connections, the 25- or 30-piece boxes offer better value per bolt. All packs ship in a labeled storage box to keep fasteners organized on the job site and easy to store for future use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails open=\"\"\u003e\n\u003csummary\u003eCan I use M8 stainless carriage bolts with pressure-treated lumber?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. A2 stainless steel is generally compatible with ACQ (Alkaline Copper Quaternary) and CA (Copper Azole) pressure-treated lumber, which can rapidly corrode standard zinc-plated or hot-dip galvanized fasteners over time. Stainless steel fasteners are typically the recommended choice for treated wood in residential deck and fence construction per IRC guidelines.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003c!-- ⑥ CTA BAR --\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your \u003cstrong\u003ebolt length and pack quantity\u003c\/strong\u003e above, then add to cart — ships from our US warehouse.\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M8 \/ 30mm \/ 30PCS","offer_id":52308509425938,"sku":"KAYFST029-8","price":12.58,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 40mm \/ 25PCS","offer_id":52308509458706,"sku":"KAYFST029-9","price":12.69,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 50mm \/ 20PCS","offer_id":52308509491474,"sku":"KAYFST029-10","price":11.76,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 60mm \/ 20PCS","offer_id":52308509524242,"sku":"KAYFST029-11","price":13.33,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 70mm \/ 15PCS","offer_id":52308509557010,"sku":"KAYFST029-12","price":12.72,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/P_009_514f56d5-13f2-460a-8bd5-c06ca02d65fd.jpg?v=1780502211"},{"product_id":"m10-carriage-bolts-a2-70-stainless-steel-coach-screws","title":"M10 Carriage Bolts A2-70 Stainless Steel | Round Head Square Neck Coach Screws","description":"\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose the right bolt length for my project?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Generally, the bolt length should equal the total thickness of the materials being joined plus enough thread engagement for the nut — typically an additional 1–2× the bolt diameter. For example, joining two 20mm boards with M10 bolts would typically call for a 50mm (≈2\\u201d) bolt. Always measure your stack-up before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does A2-70 mean and how strong are these bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A2 refers to the austenitic stainless steel grade (equivalent to 304 stainless), and 70 indicates a minimum tensile strength of 700 MPa. This makes them suitable for structural and load-bearing connections in most residential and light commercial applications.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these carriage bolts suitable for outdoor or marine use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A2 stainless steel offers excellent corrosion resistance and is generally suitable for outdoor, coastal, and humid environments. For highly aggressive marine or chemical environments, A4 (316) stainless is typically recommended instead.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What thread standard do these bolts use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These are M10 metric coarse thread bolts, conforming to ISO 8677 \/ DIN 603 standards. They are compatible with standard M10 hex nuts and washers. They are not compatible with UNC\/UNF inch-thread fasteners.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the purpose of the square neck under the round head?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The square neck is designed to embed into wood or soft materials as the nut is tightened, preventing the bolt from spinning. This allows one-person installation — no need to hold the bolt head with a wrench.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Which pack size should I choose?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Pack sizes of 8, 10, or 15 pieces are available depending on the bolt length. For small repairs or prototyping, a smaller pack is cost-effective. For larger structural builds such as decking or fencing, ordering a larger quantity per length reduces per-unit cost and shipping trips.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do I need a washer with these carriage bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A flat washer under the nut is generally recommended to distribute the clamping load and protect the surface of the material. The domed round head on the bolt side typically does not require a washer, as it already provides a broad bearing surface.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003c!-- ① OVERVIEW --\u003e\n  \u003ch2\u003eM10 Stainless Steel Carriage Bolts — Secure, Rust-Resistant Fastening for Wood and Structural Assemblies\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003cp\u003eWhether you're building a backyard deck, assembling a pergola, or reinforcing a fence post, stripped or rusted bolts can turn a weekend project into a costly headache. These M10 carriage bolts are made from A2-70 stainless steel — a grade chosen by contractors and serious DIYers who need reliable, long-lasting fasteners that won't let them down after the first rainy season.\u003c\/p\u003e\n    \u003cp\u003eEach pack contains M10 round head square neck coach screws in your chosen bolt length and quantity. The thread diameter is M10 (10mm), with bolt lengths available from 40mm (≈1-9\/16\") to 100mm (≈3-15\/16\"). Packs are available in 8, 10, or 15 pieces depending on the length selected, making it easy to order exactly what your job requires.\u003c\/p\u003e\n    \u003cp\u003eTypical applications include timber deck construction, wooden gate and fence assembly, playground equipment fastening, and structural wood-to-wood connections in sheds and outbuildings — anywhere you need a tamper-resistant, smooth-headed bolt that locks itself against rotation during tightening.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- ② COMPATIBILITY BAR --\u003e\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e\n    \u003cstrong\u003eCompatibility:\u003c\/strong\u003e M10 metric coarse thread (ISO 8677 \/ DIN 603). Fits standard M10 hex nuts and flat washers. \u003cstrong\u003eNot compatible\u003c\/strong\u003e with UNC\/UNF inch-thread fasteners. Confirm your nut thread standard before ordering.\n  \u003c\/div\u003e\n\n  \u003c!-- ③ KEY FEATURES --\u003e\n  \u003ch2\u003e✅ Key Features of These M10 Stainless Steel Carriage Bolts\u003c\/h2\u003e\n  \u003cul class=\"hdiy-features\"\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eA2-70 Stainless Steel Construction\u003c\/strong\u003e — Manufactured to ISO 3506 A2-70, delivering a minimum tensile strength of 700 MPa with inherent corrosion resistance for outdoor wood fastening applications.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔘\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eRound Dome Head Profile\u003c\/strong\u003e — The low-profile domed head sits flush and smooth on the surface, eliminating sharp edges and providing a clean finish on visible faces of decking, furniture, and gates.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⬛\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eAnti-Rotation Square Neck\u003c\/strong\u003e — The square shank under the head bites into timber as the nut is driven, locking the bolt in place without needing a second tool — ideal for single-person installation in tight spaces.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eMultiple Length Options\u003c\/strong\u003e — Available in 40mm, 50mm, 60mm, 70mm, 90mm, and 100mm to cover a wide range of timber thicknesses, from single-board connections to multi-layer structural assemblies.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eJob-Matched Pack Quantities\u003c\/strong\u003e — Choose 8, 10, or 15 pieces per box based on your project scale, reducing waste and letting you order the right amount for deck boards, fence rails, or framing connections.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🌧️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eOutdoor and Coastal Durability\u003c\/strong\u003e — A2 stainless resists rust and staining in rain-exposed, humid, and coastal environments, making these coach screws a dependable choice for exterior structural wood connections.\u003c\/span\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003c!-- ④ TECHNICAL SPECIFICATIONS --\u003e\n  \u003ch2\u003e📐 Technical Specifications — M10 Round Head Square Neck Carriage Bolts\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eCarriage Bolt (Coach Screw \/ Round Head Square Neck Bolt)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eStandard\u003c\/th\u003e\n\u003ctd\u003eISO 8677 \/ DIN 603\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial Grade\u003c\/th\u003e\n\u003ctd\u003eA2-70 Stainless Steel (ISO 3506, equiv. 304 SS)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Diameter\u003c\/th\u003e\n\u003ctd\u003eM10 (10mm \/ ≈3\/8\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Type\u003c\/th\u003e\n\u003ctd\u003eMetric Coarse (ISO standard pitch)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e40mm (≈1-9\/16\"), 50mm (≈2\"), 60mm (≈2-3\/8\"), 70mm (≈2-3\/4\"), 90mm (≈3-9\/16\"), 100mm (≈3-15\/16\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eRound Dome Head\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eNeck Style\u003c\/th\u003e\n\u003ctd\u003eSquare Neck (anti-rotation)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTensile Strength\u003c\/th\u003e\n\u003ctd\u003e700 MPa minimum (A2-70 rating)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eMill \/ Natural Stainless (no coating)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePack Quantities\u003c\/th\u003e\n\u003ctd\u003e8 PCS, 10 PCS, or 15 PCS (varies by length — see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCompatible Nut\u003c\/th\u003e\n\u003ctd\u003eStandard M10 Hex Nut (sold separately)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eRecommended Washer\u003c\/th\u003e\n\u003ctd\u003eM10 Flat Washer under nut (sold separately)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eDrive Method\u003c\/th\u003e\n\u003ctd\u003eNo drive required on bolt head — tighten nut with 17mm wrench or socket\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-note\"\u003e\n    \u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e\n    \u003cstrong\u003eSpec Note:\u003c\/strong\u003e Thread pitch and exact head\/neck dimensions follow DIN 603 standards. If your application requires confirmed dimensional tolerances, contact us to confirm before ordering.\n  \u003c\/div\u003e\n\n  \u003c!-- ⑤ FAQ --\u003e\n  \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-faq\"\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right bolt length for my project?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eGenerally, the bolt length should equal the total thickness of the materials being joined plus enough thread engagement for the nut — typically an additional 1–2× the bolt diameter. For M10 bolts, that means adding roughly 10–20mm beyond your material stack. For example, joining two 20mm boards would typically call for a 50mm (≈2\") bolt. Always measure your full stack-up — including any washers — before selecting a length.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat does A2-70 mean and how strong are these bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA2 refers to the austenitic stainless steel alloy group (equivalent to 304 stainless steel), and 70 indicates a minimum tensile strength of 700 MPa per ISO 3506. This makes them suitable for structural and load-bearing wood connections in most residential and light commercial applications, including decking, fencing, and timber framing.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these carriage bolts suitable for outdoor or marine use?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA2 stainless steel offers excellent corrosion resistance and is generally suitable for outdoor, coastal, and humid environments — including rain-exposed decks, garden structures, and fence assemblies. For highly aggressive marine or chemical environments where saltwater immersion is frequent, A4 (316) stainless is typically recommended instead.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat thread standard do these bolts use — are they compatible with standard nuts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese are M10 metric coarse thread bolts conforming to ISO 8677 \/ DIN 603. They are compatible with standard M10 metric hex nuts and flat washers. They are \u003cstrong\u003enot\u003c\/strong\u003e compatible with UNC or UNF inch-thread fasteners. If you are unsure of your existing hardware's thread standard, check the nut markings or measure the thread pitch before ordering.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the purpose of the square neck under the round head?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThe square neck is designed to embed into wood or soft materials as the nut is tightened, preventing the bolt from spinning in place. This allows single-person installation — you can drive the nut from one side without needing to hold the bolt head with a second wrench. It is particularly useful when the bolt head is recessed or in a hard-to-reach location.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhich pack size should I choose — 8, 10, or 15 pieces?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003ePack size varies by bolt length. Shorter bolts (40mm) are available in 15-piece packs, mid-range lengths (50mm–70mm) in 10-piece packs, and longer bolts (100mm) in 8-piece packs. For small repairs or prototyping, a single pack is typically sufficient. For larger builds such as full deck sections or fence runs, consider ordering multiple packs to reduce per-unit cost and avoid mid-project shortages.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDo I need a washer with these carriage bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA flat washer under the nut is generally recommended to distribute the clamping load across a wider surface area and protect the timber from the nut bearing directly into the grain. The domed round head on the bolt side typically does not require a washer, as it already provides a broad, smooth bearing surface. Washers are sold separately.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003c!-- ⑥ CTA BAR --\u003e\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your \u003cstrong\u003ethread diameter, bolt length, and pack quantity\u003c\/strong\u003e above, then add to cart — ships from our US warehouse.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M10 \/ 40mm \/ 15PCS","offer_id":52308509851922,"sku":"KAYFST029-13","price":13.15,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 50mm \/ 10PCS","offer_id":52308509884690,"sku":"KAYFST029-14","price":11.52,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 60mm \/ 10PCS","offer_id":52308509917458,"sku":"KAYFST029-15","price":12.17,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 70mm \/ 10PCS","offer_id":52308509950226,"sku":"KAYFST029-16","price":13.26,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 90mm \/ 10PCS","offer_id":52308509982994,"sku":"KAYFST029-17","price":15.44,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 100mm \/ 8PCS","offer_id":52308510015762,"sku":"KAYFST029-18","price":14.44,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/1_5_be7ba794-bbc4-4a97-b34e-b18d51e142dd.jpg?v=1780502216"},{"product_id":"m6-carriage-bolts-a2-stainless-steel-cup-square-coach-bolt","title":"M6 Carriage Bolts A2 Stainless Steel — Cup Square Coach Bolt with Dome Head, M6×12mm to M6×60mm","description":"\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose the right length for M6 carriage bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A general rule is to add the thickness of all materials being joined, then add 10–15mm for the nut and washer. For example, joining two 20mm (3\/4\\\") boards typically calls for an M6×50mm bolt. Available lengths here range from 12mm (1\/2\\\") to 60mm (2-3\/8\\\").\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does A2 stainless steel mean, and how strong are these bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A2 stainless steel (also called 304 stainless) is a widely used austenitic grade offering good corrosion resistance and a tensile strength of generally 500–700 MPa. It is suitable for most indoor and light outdoor structural applications.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can these M6 carriage bolts be used outdoors or in wet environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. A2 stainless steel resists rust and oxidation in most outdoor and humid conditions. For highly corrosive environments such as coastal or marine settings, A4 (316) stainless steel is generally recommended instead.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What nut and washer thread standard do these bolts use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These are M6 metric-thread bolts with a standard 1.0mm pitch, compatible with any M6 metric nut or washer. They are not compatible with imperial (SAE\/UNC\/UNF) fasteners.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How does the cup square (carriage bolt) neck prevent the bolt from spinning?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The square section directly beneath the dome head bites into the material — typically wood — as the nut is tightened, locking the bolt in place without needing a wrench on the bolt head. This makes installation faster and leaves a clean, tool-free finish on the visible face.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do I need a washer with these carriage bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A washer under the nut is generally recommended to distribute clamping load and protect the surface. The dome head side typically does not require a washer since it sits flush against the material.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Which pack size should I order — 5, 10, or 20 pieces?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"For small repairs or single-joint projects, the 5-piece pack is usually sufficient. The 10-piece pack suits most deck boards, fence panels, or furniture builds. The 20-piece pack offers the best per-unit value for larger projects or when you want spares on hand.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003ch2\u003eM6 Carriage Bolts in A2 Stainless Steel — Secure, Rust-Resistant Fastening for Wood \u0026amp; Outdoor Projects\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003cp\u003eStripped threads, spinning bolt heads, and rust stains on your finished woodwork — these are the frustrations that send DIYers and contractors back to the hardware store mid-project. Whether you're building a backyard deck, assembling a timber frame, or hanging a gate, you need a fastener that stays put, looks clean, and holds up to the elements. These M6 cup square carriage bolts are designed for exactly that.\u003c\/p\u003e\n    \u003cp\u003eEach bolt is machined from A2 (304) stainless steel and features a smooth dome head with a square-shouldered neck that self-locks into wood without a second wrench. Available in 11 lengths from 12mm (½\") to 60mm (2⅜\") and in packs of 5, 10, or 20, they cover everything from thin panel joints to thick structural timbers. The M6 metric thread (1.0mm pitch) pairs with any standard M6 nut and washer.\u003c\/p\u003e\n    \u003cp\u003eTypical applications include deck board fastening, pergola and fence construction, timber furniture assembly, and general outdoor woodworking — anywhere you need a flush, tamper-resistant bolt face with reliable clamping force on the nut side.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e\n    \u003cstrong\u003eCompatibility:\u003c\/strong\u003e M6 metric thread (pitch 1.0mm) — fits all standard M6 nuts and washers. Not compatible with imperial (SAE\/UNC\/UNF) fasteners. Square neck is designed for use in wood; pre-drilling is recommended for hardwoods.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e✅ Key Features of These M6 Stainless Steel Carriage Bolts\u003c\/h2\u003e\n  \u003cul class=\"hdiy-features\"\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eA2 Stainless Steel Construction\u003c\/strong\u003e — Grade 304 stainless resists rust, oxidation, and staining in outdoor, humid, and light marine environments without surface coatings that can chip or peel.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🔒\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eSelf-Locking Cup Square Neck\u003c\/strong\u003e — The square shoulder beneath the dome head embeds into wood as the nut is tightened, preventing rotation and eliminating the need for a second tool on the bolt side.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e✨\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eClean Dome Head Finish\u003c\/strong\u003e — The low-profile rounded head sits flush and smooth on the visible face of your workpiece — ideal for deck boards, furniture, and any application where appearance matters.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003e11 Lengths from 12mm to 60mm\u003c\/strong\u003e — From 12mm (½\") for thin panel joints to 60mm (2⅜\") for thick structural timbers, one listing covers the full range of common M6 carriage bolt applications.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eFlexible Pack Sizes (5 \/ 10 \/ 20 pcs)\u003c\/strong\u003e — Order exactly what your project needs. The 20-piece pack offers the lowest per-unit cost for larger builds or when keeping spares on hand.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eStandard M6 Metric Thread (1.0mm Pitch)\u003c\/strong\u003e — Fully compatible with any M6 metric nut, wing nut, or washer. No proprietary hardware required — easy to source replacements anywhere.\u003c\/span\u003e\n    \u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003e📐 Technical Specifications — M6 Cup Square Carriage Bolts\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Size\u003c\/th\u003e\n\u003ctd\u003eM6 (6mm diameter, 1.0mm pitch)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e12mm (½\"), 16mm (⅝\"), 20mm (¾\"), 25mm (1\"), 30mm (1³⁄₁₆\"), 35mm (1⅜\"), 40mm (1⁹⁄₁₆\"), 45mm (1¾\"), 50mm (2\"), 55mm (2³⁄₁₆\"), 60mm (2⅜\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePack Sizes\u003c\/th\u003e\n\u003ctd\u003e5 pieces, 10 pieces, 20 pieces\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Type\u003c\/th\u003e\n\u003ctd\u003eDome (round) head — cup square carriage bolt profile\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eNeck Type\u003c\/th\u003e\n\u003ctd\u003eCup square (self-locking in wood)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eA2 Stainless Steel (Grade 304)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural stainless (no coating)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTensile Strength\u003c\/th\u003e\n\u003ctd\u003eTypically 500–700 MPa (A2-50 to A2-70 class)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eISO metric coarse thread\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eDrive Type\u003c\/th\u003e\n\u003ctd\u003eNo drive (nut-side tightening only)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCompatible Nut\u003c\/th\u003e\n\u003ctd\u003eStandard M6 metric hex nut (sold separately)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eRecommended Use\u003c\/th\u003e\n\u003ctd\u003eWood, timber, decking, fencing, furniture assembly\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCorrosion Resistance\u003c\/th\u003e\n\u003ctd\u003eGood — suitable for outdoor and humid environments; see note for marine use\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-note\"\u003e\n    \u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e\n    \u003cstrong\u003eMarine or highly corrosive environments:\u003c\/strong\u003e A2 stainless steel performs well in most outdoor conditions, but for saltwater or coastal exposure, A4 (316) stainless steel is generally recommended. Contact us to confirm suitability for your specific application.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-faq\"\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right length for M6 carriage bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eAdd up the total thickness of all materials being joined, then add approximately 10–15mm to allow for a washer and nut. For example, joining two 20mm (¾\") boards typically calls for an M6×50mm bolt. Lengths available here range from 12mm (½\") to 60mm (2⅜\"), covering most standard timber and panel thicknesses.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat does A2 stainless steel mean, and how strong are these bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA2 stainless steel — also known as Grade 304 — is the most widely used austenitic stainless alloy. It offers good corrosion resistance and a tensile strength of generally 500–700 MPa depending on the property class (A2-50 or A2-70). This makes it suitable for most structural woodworking, furniture, and outdoor fastening applications.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan these M6 carriage bolts be used outdoors or in wet environments?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eYes. A2 stainless steel resists rust and oxidation in most outdoor, humid, and freshwater environments without any additional coating. For highly corrosive settings — such as coastal, marine, or chemical-exposure environments — A4 (316) stainless steel is generally the better choice. Contact us if you need guidance for your specific conditions.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat nut and washer thread standard do these bolts use?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese bolts use a standard ISO metric M6 coarse thread with a 1.0mm pitch. They are compatible with any M6 metric hex nut, wing nut, or washer. They are \u003cstrong\u003enot\u003c\/strong\u003e compatible with imperial (SAE, UNC, or UNF) fasteners — do not mix metric and imperial hardware.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow does the cup square neck stop the bolt from spinning during installation?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThe square section directly beneath the dome head is slightly larger than the shank. As you tighten the nut, this square shoulder bites into the surrounding wood, locking the bolt in place. This means you only need a wrench on the nut side — no need to hold the bolt head, and no tool marks on the finished face of your workpiece.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDo I need a washer with these carriage bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA flat washer under the nut is generally recommended. It distributes the clamping load over a wider area, reducing the chance of the nut pulling through softer wood. The dome head side typically does not require a washer — it sits flush against the material surface by design.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhich pack size should I order — 5, 10, or 20 pieces?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThe 5-piece pack suits small repairs or single-joint projects. The 10-piece pack covers most deck board runs, fence panels, or furniture builds. The 20-piece pack offers the best per-unit value for larger projects or when you want extras on hand for future repairs. All pack sizes are available across all 11 lengths.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your size and quantity above, then add to cart — ships from our US warehouse.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M6 \/ 12mm \/ 5PCS","offer_id":52308510408978,"sku":"GLFBCQFGB05941x5","price":3.45,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 16mm \/ 5PCS","offer_id":52308510441746,"sku":"GLFBCQFGB05942x5","price":3.56,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 20mm \/ 5PCS","offer_id":52308510474514,"sku":"GLFBCQFGB05943x5","price":3.88,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 25mm \/ 5PCS","offer_id":52308510507282,"sku":"GLFBCQFGB05944x5","price":4.38,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 30mm \/ 5PCS","offer_id":52308510540050,"sku":"GLFBCQFGB05945x5","price":4.91,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 35mm \/ 5PCS","offer_id":52308510572818,"sku":"GLFBCQFGB05946x5","price":5.41,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 40mm \/ 5PCS","offer_id":52308510605586,"sku":"GLFBCQFGB05947x5","price":5.93,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 45mm \/ 5PCS","offer_id":52308510638354,"sku":"GLFBCQFGB05948x5","price":6.43,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 50mm \/ 5PCS","offer_id":52308510671122,"sku":"GLFBCQFGB05949x5","price":6.99,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 55mm \/ 5PCS","offer_id":52308510703890,"sku":"GLFBCQFGB05950x5","price":7.58,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 60mm \/ 5PCS","offer_id":52308510736658,"sku":"GLFBCQFGB05951x5","price":7.89,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 12mm \/ 10PCS","offer_id":52308510769426,"sku":"GLFBCQFGB05941x10","price":5.44,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 16mm \/ 10PCS","offer_id":52308510802194,"sku":"GLFBCQFGB05942x10","price":6.0,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 20mm \/ 10PCS","offer_id":52308510834962,"sku":"GLFBCQFGB05943x10","price":6.62,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 25mm \/ 10PCS","offer_id":52308510867730,"sku":"GLFBCQFGB05944x10","price":7.64,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 30mm \/ 10PCS","offer_id":52308510900498,"sku":"GLFBCQFGB05945x10","price":8.72,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 35mm \/ 10PCS","offer_id":52308510933266,"sku":"GLFBCQFGB05946x10","price":9.72,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 40mm \/ 10PCS","offer_id":52308510966034,"sku":"GLFBCQFGB05947x10","price":10.74,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 45mm \/ 10PCS","offer_id":52308510998802,"sku":"GLFBCQFGB05948x10","price":11.75,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 50mm \/ 10PCS","offer_id":52308511031570,"sku":"GLFBCQFGB05949x10","price":12.87,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 55mm \/ 10PCS","offer_id":52308511064338,"sku":"GLFBCQFGB05950x10","price":14.04,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 60mm \/ 10PCS","offer_id":52308511097106,"sku":"GLFBCQFGB05951x10","price":14.66,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 12mm \/ 20PCS","offer_id":52308511129874,"sku":"GLFBCQFGB05941x20","price":9.78,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 16mm \/ 20PCS","offer_id":52308511162642,"sku":"GLFBCQFGB05942x20","price":10.89,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 20mm \/ 20PCS","offer_id":52308511195410,"sku":"GLFBCQFGB05943x20","price":12.14,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 25mm \/ 20PCS","offer_id":52308511228178,"sku":"GLFBCQFGB05944x20","price":14.16,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 30mm \/ 20PCS","offer_id":52308511260946,"sku":"GLFBCQFGB05945x20","price":16.31,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 35mm \/ 20PCS","offer_id":52308511293714,"sku":"GLFBCQFGB05946x20","price":18.32,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 40mm \/ 20PCS","offer_id":52308511326482,"sku":"GLFBCQFGB05947x20","price":20.37,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 45mm \/ 20PCS","offer_id":52308511359250,"sku":"GLFBCQFGB05948x20","price":22.39,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 50mm \/ 20PCS","offer_id":52308511392018,"sku":"GLFBCQFGB05949x20","price":24.62,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 55mm \/ 20PCS","offer_id":52308511424786,"sku":"GLFBCQFGB05950x20","price":26.97,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 60mm \/ 20PCS","offer_id":52308511457554,"sku":"GLFBCQFGB05951x20","price":28.22,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/2_9_1e1f7e73-058c-47a3-a340-ba1885b8d245.jpg?v=1780501929"},{"product_id":"304-stainless-steel-carriage-bolts-m3-m4-m5-m6-round-head-square-neck","title":"304 Stainless Steel Carriage Bolts M3 M4 M5 M6 — Round Head Square Neck, Multiple Lengths","description":"\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose the right length for my carriage bolt?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A general rule is to select a bolt length equal to the total thickness of the materials being joined, plus enough thread engagement for the nut — typically an additional 1–2× the bolt diameter. For example, joining two 10mm boards with M5 bolts would generally call for a length of 25–30mm. When in doubt, size up rather than down.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What thread standard do these carriage bolts use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These bolts follow the metric coarse thread standard (ISO 68-1 \/ DIN 603), which is the most widely used metric thread pitch in hardware and construction. M3, M4, M5, and M6 sizes are compatible with standard metric nuts and washers of the same designation.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these carriage bolts suitable for outdoor or marine use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Made from 304 stainless steel, these bolts offer strong resistance to rust, oxidation, and general corrosion, making them well-suited for outdoor furniture, garden structures, and light marine environments. For highly aggressive saltwater or chemical exposure, 316 stainless steel is generally recommended.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong are these stainless steel carriage bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"304 stainless steel carriage bolts typically have a tensile strength of around 500–700 MPa, depending on the manufacturing process. They are suitable for general structural fastening in wood, light metal, and composite materials. For heavy structural or load-bearing applications, consult an engineer for proper sizing.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the purpose of the square neck on a carriage bolt?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The square neck sits directly beneath the round dome head. When the bolt is driven into a pre-drilled square or round hole in wood or soft material, the neck bites into the material and prevents the bolt from spinning as you tighten the nut from the other side — no wrench needed on the bolt head.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these bolts with wood, metal, or plastic?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These carriage bolts are most commonly used with wood and wood composites, where the square neck can grip the material. They can also be used with thin metal or plastic panels when a square-hole punch or appropriate insert is used. Always ensure the hole diameter matches the bolt shank for a secure fit.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do these bolts come with nuts and washers?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These listings are for carriage bolts only. Matching metric nuts and washers are sold separately. We recommend pairing with standard metric hex nuts and flat washers of the same size designation (M3, M4, M5, or M6) for a complete fastening assembly.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003e304 Stainless Steel Carriage Bolts — Secure, Rust-Resistant Fastening for Wood \u0026amp; DIY Projects\u003c\/h2\u003e\n    \u003cp\u003eWhether you're assembling outdoor furniture, building a deck railing, or tackling a workshop project, loose fasteners and rust stains are a constant frustration. DIYers and contractors who work with wood need a bolt that stays put without spinning — and holds up to moisture without corroding. These \u003cstrong\u003e304 stainless steel carriage bolts\u003c\/strong\u003e are built for exactly that job.\u003c\/p\u003e\n    \u003cp\u003eEach bolt features a smooth \u003cstrong\u003eround dome head\u003c\/strong\u003e and a \u003cstrong\u003esquare neck\u003c\/strong\u003e that locks into wood to prevent rotation during tightening. Available in metric sizes \u003cstrong\u003eM3, M4, M5, and M6\u003c\/strong\u003e, with lengths ranging from \u003cstrong\u003e8mm (≈5\/16\")\u003c\/strong\u003e up to \u003cstrong\u003e70mm (≈2-3\/4\")\u003c\/strong\u003e depending on the size selected. Sold in packs of 2 to 200 so you can order exactly what your project requires — no waste, no shortage.\u003c\/p\u003e\n    \u003cp\u003eTypical applications include \u003cstrong\u003eoutdoor wood furniture assembly\u003c\/strong\u003e, \u003cstrong\u003efence and gate construction\u003c\/strong\u003e, \u003cstrong\u003eDIY shelving and workbench builds\u003c\/strong\u003e, and \u003cstrong\u003eplayground or deck hardware replacement\u003c\/strong\u003e. The corrosion-resistant 304 stainless steel construction makes these bolts a reliable choice wherever weather exposure is a concern.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e\n    \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Fits standard metric hex nuts and flat washers — M3, M4, M5, and M6 designations. Conforms to DIN 603 \/ ISO 8677 round head square neck bolt standard. Works with wood, wood composites, and soft materials where the square neck can seat properly.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e✅ Key Features of These Stainless Steel Carriage Bolts\u003c\/h2\u003e\n  \u003cul class=\"hdiy-features\"\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003e304 Stainless Steel Construction\u003c\/strong\u003e — Resists rust, oxidation, and general corrosion, making these bolts reliable for outdoor furniture, garden structures, and damp environments where standard zinc-plated bolts would fail prematurely.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🔒\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eAnti-Spin Square Neck\u003c\/strong\u003e — The square shoulder beneath the dome head bites into wood or soft material, locking the bolt in place so you can tighten the nut single-handed — no need to hold the bolt head with a second wrench.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eWide Size Range — M3 to M6\u003c\/strong\u003e — Four metric diameters with multiple length options per size let you match the exact fastener to your material thickness, from light M3 joinery up to heavier M6 structural connections.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eSmooth Round Dome Head\u003c\/strong\u003e — The low-profile, snag-free head sits flush against the surface for a clean finished look on visible faces — ideal for furniture, cabinetry, and any application where exposed bolt heads matter.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e — Order as few as 2 or as many as 200 per pack. Whether you need a handful for a quick repair or a bulk supply for a larger build, you can right-size your order without overpaying for extras.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eDIN 603 Metric Thread Standard\u003c\/strong\u003e — Machined to metric coarse thread specifications, these carriage bolts for wood and metal are fully compatible with standard metric hex nuts and washers — no hunting for specialty hardware.\u003c\/span\u003e\n    \u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003e📐 Technical Specifications — Stainless Steel Carriage Bolts\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e304 Stainless Steel (A2)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Type\u003c\/th\u003e\n\u003ctd\u003eRound dome head (mushroom head)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eNeck Type\u003c\/th\u003e\n\u003ctd\u003eSquare neck (anti-rotation)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eMetric coarse thread — DIN 603 \/ ISO 8677\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Diameters\u003c\/th\u003e\n\u003ctd\u003eM3, M4, M5, M6\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e8mm (≈5\/16\") – 70mm (≈2-3\/4\") — varies by diameter; see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePack Quantities\u003c\/th\u003e\n\u003ctd\u003e2 \/ 5 \/ 10 \/ 15 \/ 20 \/ 30 \/ 50 \/ 80 \/ 100 \/ 200 — varies by size\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eNatural stainless (brushed\/satin)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCorrosion Resistance\u003c\/th\u003e\n\u003ctd\u003eSuitable for outdoor and damp environments; not rated for continuous saltwater immersion\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCompatible Fasteners\u003c\/th\u003e\n\u003ctd\u003eStandard metric hex nuts and flat washers (same size designation)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTypical Use\u003c\/th\u003e\n\u003ctd\u003eWood joinery, outdoor furniture, fencing, DIY construction\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-note\"\u003e\n    \u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e\n    \u003cstrong\u003eHeads up:\u003c\/strong\u003e Length options vary by diameter. Please check the variant selector carefully to confirm the exact size combination before adding to cart. If you need a size not listed, contact us to confirm availability.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-faq\"\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right length for my carriage bolt?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA general rule is to select a bolt length equal to the total thickness of the materials being joined, plus enough thread engagement for the nut — typically an additional 1–2× the bolt diameter. For example, joining two 10mm (≈3\/8\") boards with M5 bolts would generally call for a length of 25–30mm (≈1\"–1-3\/16\"). When in doubt, size up rather than down to ensure full thread engagement.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat thread standard do these carriage bolts use — are they compatible with standard metric nuts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese bolts follow the metric coarse thread standard per DIN 603 \/ ISO 8677, which is the most widely used metric thread pitch in hardware and construction. M3, M4, M5, and M6 sizes are fully compatible with standard metric hex nuts and flat washers of the same designation — no specialty hardware required.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these carriage bolts suitable for outdoor or marine use?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eYes. Made from 304 stainless steel (also known as A2 stainless), these bolts offer strong resistance to rust, oxidation, and general atmospheric corrosion, making them well-suited for outdoor furniture, garden structures, fencing, and light marine environments. For highly aggressive saltwater immersion or chemical exposure, 316 stainless steel is generally recommended instead.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow strong are these stainless steel carriage bolts — what loads can they handle?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003e304 stainless steel carriage bolts typically have a tensile strength of around 500–700 MPa, depending on the manufacturing process. They are suitable for general structural fastening in wood, light metal, and composite materials. For heavy structural or load-bearing applications — such as deck ledger boards or structural timber frames — consult a licensed engineer to confirm proper bolt sizing and spacing.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhy does a carriage bolt have a square neck — and how does it work?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThe square neck sits directly beneath the round dome head. When the bolt is driven into a pre-drilled hole in wood or a soft material, the square shoulder bites into the surrounding material and prevents the bolt from spinning as you tighten the nut from the other side. This means you only need one wrench — on the nut — making installation faster and easier, especially in tight spaces.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use these bolts with metal or plastic, or only with wood?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese carriage bolts are most commonly used with wood and wood composites, where the square neck can grip the material naturally. They can also be used with thin metal panels or plastic when a square-hole punch or appropriate insert is used to seat the neck. In metal-to-metal applications, the anti-rotation feature may not engage — in that case, a standard hex bolt with a wrench on both ends is generally a better choice.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDo these bolts come with nuts and washers included?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese listings are for carriage bolts only — nuts and washers are not included. We recommend pairing with standard metric hex nuts and flat washers of the same size designation (M3, M4, M5, or M6) for a complete fastening assembly. These are widely available at any hardware store or online.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I convert the bolt lengths between millimeters and inches?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA quick reference for the lengths available in this listing:\u003c\/p\u003e\n        \u003cul class=\"hdiy-list\"\u003e\n          \u003cli\u003e8mm ≈ 5\/16\"\u003c\/li\u003e\n          \u003cli\u003e10mm ≈ 3\/8\"\u003c\/li\u003e\n          \u003cli\u003e12mm ≈ 15\/32\"\u003c\/li\u003e\n          \u003cli\u003e14mm ≈ 9\/16\"\u003c\/li\u003e\n          \u003cli\u003e16mm ≈ 5\/8\"\u003c\/li\u003e\n          \u003cli\u003e18mm ≈ 11\/16\"\u003c\/li\u003e\n          \u003cli\u003e20mm ≈ 25\/32\"\u003c\/li\u003e\n          \u003cli\u003e25mm ≈ 1\"\u003c\/li\u003e\n          \u003cli\u003e30mm ≈ 1-3\/16\"\u003c\/li\u003e\n          \u003cli\u003e35mm ≈ 1-3\/8\"\u003c\/li\u003e\n          \u003cli\u003e40mm ≈ 1-9\/16\"\u003c\/li\u003e\n          \u003cli\u003e45mm ≈ 1-3\/4\"\u003c\/li\u003e\n          \u003cli\u003e50mm ≈ 2\"\u003c\/li\u003e\n          \u003cli\u003e70mm ≈ 2-3\/4\"\u003c\/li\u003e\n        \u003c\/ul\u003e\n        \u003cp\u003eTo convert any mm value to inches, divide by 25.4.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your size and length above, then add to cart — ships from our US warehouse.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M3 \/ 8mm \/ 10PCS","offer_id":52308512506130,"sku":"GLFBQLPBRTQJD023309x10","price":1.84,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 8mm \/ 20PCS","offer_id":52308512538898,"sku":"GLFBQLPBRTQJD023309x20","price":2.11,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 8mm \/ 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80PCS","offer_id":52308512801042,"sku":"GLFBQLPBRTQJD023310x80","price":4.34,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 10mm \/ 100PCS","offer_id":52308512833810,"sku":"GLFBQLPBRTQJD023310x100","price":5.24,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 10mm \/ 200PCS","offer_id":52308512866578,"sku":"GLFBQLPBRTQJD023310x200","price":9.72,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 14mm \/ 10PCS","offer_id":52308512899346,"sku":"GLFBQLPBRTQJD023311x10","price":1.89,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 14mm \/ 20PCS","offer_id":52308512932114,"sku":"GLFBQLPBRTQJD023311x20","price":2.16,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 14mm \/ 50PCS","offer_id":52308512964882,"sku":"GLFBQLPBRTQJD023311x50","price":3.52,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 14mm \/ 80PCS","offer_id":52308512997650,"sku":"GLFBQLPBRTQJD023311x80","price":5.15,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 14mm \/ 100PCS","offer_id":52308513030418,"sku":"GLFBQLPBRTQJD023311x100","price":6.24,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 14mm \/ 200PCS","offer_id":52308513063186,"sku":"GLFBQLPBRTQJD023311x200","price":11.82,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 16mm \/ 10PCS","offer_id":52308513095954,"sku":"GLFBQLPBRTQJD023312x10","price":1.89,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 16mm \/ 20PCS","offer_id":52308513128722,"sku":"GLFBQLPBRTQJD023312x20","price":2.16,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 16mm \/ 50PCS","offer_id":52308513161490,"sku":"GLFBQLPBRTQJD023312x50","price":3.79,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 16mm \/ 80PCS","offer_id":52308513194258,"sku":"GLFBQLPBRTQJD023312x80","price":5.64,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 16mm \/ 100PCS","offer_id":52308513227026,"sku":"GLFBQLPBRTQJD023312x100","price":6.79,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 16mm \/ 200PCS","offer_id":52308513259794,"sku":"GLFBQLPBRTQJD023312x200","price":12.91,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 18mm \/ 10PCS","offer_id":52308513292562,"sku":"GLFBQLPBRTQJD023313x10","price":1.97,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 18mm \/ 20PCS","offer_id":52308513325330,"sku":"GLFBQLPBRTQJD023313x20","price":2.3,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 18mm \/ 50PCS","offer_id":52308513358098,"sku":"GLFBQLPBRTQJD023313x50","price":4.2,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 18mm \/ 80PCS","offer_id":52308513390866,"sku":"GLFBQLPBRTQJD023313x80","price":6.24,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 18mm \/ 100PCS","offer_id":52308513423634,"sku":"GLFBQLPBRTQJD023313x100","price":7.6,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 18mm \/ 200PCS","offer_id":52308513456402,"sku":"GLFBQLPBRTQJD023313x200","price":14.54,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 25mm \/ 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For example, joining two 20mm boards typically calls for a bolt of at least 50mm (≈2\\\"): 40mm of material plus room for the nut and washer. When in doubt, size up.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between full thread and partial thread carriage bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Full-thread bolts are threaded along their entire shank and are generally used for thinner materials or where maximum thread engagement is needed. Partial-thread bolts have a smooth shank section near the head that locks into the material, reducing the chance of the joint rotating — typically preferred for thicker timber connections.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these carriage bolts suitable for outdoor use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These bolts feature a zinc-plated finish that provides moderate corrosion resistance, making them suitable for covered outdoor structures and dry exterior environments. For prolonged direct exposure to rain or coastal conditions, a hot-dip galvanized or stainless steel fastener is generally recommended.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What thread standard do these bolts use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These bolts follow the ISO metric coarse thread standard (DIN 603 \/ DIN 934 compatible). M8 bolts typically use a 1.25mm pitch, M10 a 1.5mm pitch, and M12 a 1.75mm pitch. They are compatible with standard metric hex nuts and washers.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How much load can these carriage bolts handle?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Load capacity depends on the bolt diameter, length, material grade, and installation method. These zinc-plated steel bolts are generally rated for Grade 4.8 or equivalent tensile strength. For structural or load-bearing applications, consult an engineer and verify the specific grade marking on the bolt head.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do the hex nuts come included with the bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — each set includes matching zinc-plated hex nuts. The quantity of nuts corresponds to the number of bolts in your selected pack (e.g., a 10-piece pack includes 10 bolts and 10 nuts). Washers are not included and should be sourced separately if needed.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Which size should I choose — M8, M10, or M12?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"M8 bolts are commonly used for light-to-medium timber framing, furniture assembly, and general DIY projects. M10 is a step up for heavier structural connections such as deck framing or gate hardware. M12 is typically chosen for heavy-duty applications like pergola posts, machinery mounting, or load-bearing brackets. When in doubt, check the specification of the hardware or bracket you are fastening to.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003c!-- ① OVERVIEW --\u003e\n  \u003ch2\u003eM8 M10 M12 Carriage Bolts with Hex Nuts — Reliable Zinc-Plated Fasteners for Timber \u0026amp; Structural Work\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003cp\u003eWhether you're building a backyard deck, assembling a pergola, or reinforcing a gate frame, loose or mismatched fasteners can derail the whole job. These M8, M10, and M12 carriage bolts with hex nuts give DIYers and tradespeople a dependable, ready-to-install fastener set sized for real-world timber and metal connections.\u003c\/p\u003e\n    \u003cp\u003eEach set includes matching zinc-plated steel carriage bolts and hex nuts. Bolt diameters span M8, M10, and M12; lengths run from 12mm (≈1\/2\") up to 150mm (≈5-7\/8\"), available in both full-thread and partial-thread configurations. Pack sizes range from 2 pieces up to 100 pieces, so you can grab a small trial quantity or stock up for a larger build. The smooth domed head and square neck lock into timber to prevent spinning during tightening — no wrench needed on the bolt side.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include deck and fence post connections, pergola and carport framing, gate hinge and latch mounting, and general workshop jigs or furniture assembly. The zinc coating makes these carriage bolts for outdoor wood projects a practical choice for covered or semi-exposed environments, while the metric thread pattern ensures compatibility with standard metric hardware across the board.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- ② COMPATIBILITY BAR --\u003e\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e\n    \u003cstrong\u003eThread Compatibility:\u003c\/strong\u003e ISO metric coarse thread (DIN 603 style) — M8 × 1.25mm pitch, M10 × 1.5mm pitch, M12 × 1.75mm pitch. Compatible with standard metric hex nuts, flat washers, and lock washers.\n  \u003c\/div\u003e\n\n  \u003c!-- ③ KEY FEATURES --\u003e\n  \u003ch2\u003e✅ Key Features of These Zinc-Plated Metric Carriage Bolts\u003c\/h2\u003e\n  \u003cul class=\"hdiy-features\"\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔒\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eAnti-Spin Square Neck\u003c\/strong\u003e — The square shoulder under the domed head bites into timber and soft materials, holding the bolt in place so you can tighten the nut single-handed without a second tool.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eWide Size Range\u003c\/strong\u003e — Available in M8, M10, and M12 diameters with lengths from 12mm to 150mm, covering the most common carriage bolt sizes for deck, fence, and framing work.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFull \u0026amp; Partial Thread Options\u003c\/strong\u003e — Shorter lengths come fully threaded for maximum grip in thin stock; longer bolts use a partial-thread shank that locks into the material and resists joint rotation under load.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eZinc-Plated Finish\u003c\/strong\u003e — The electroplated zinc coating provides a corrosion-resistant barrier suited for indoor, workshop, and covered outdoor applications, extending service life compared to bare steel.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eMatching Hex Nuts Included\u003c\/strong\u003e — Every pack ships with the corresponding number of zinc-plated hex nuts, so you have a complete fastener set without hunting for compatible hardware separately.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e — Choose from 2, 5, 10, 20, 25, 50, or 100-piece packs to match your project scale — whether it's a single repair or a bulk supply for a full deck build.\u003c\/span\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003c!-- ④ TECHNICAL SPECIFICATIONS --\u003e\n  \u003ch2\u003e📐 Technical Specifications — Metric Carriage Bolts with Hex Nuts\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eBolt Type\u003c\/th\u003e\n\u003ctd\u003eCarriage Bolt (Cup Square \/ Coach Screw style, round domed head with square neck)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Diameters\u003c\/th\u003e\n\u003ctd\u003eM8, M10, M12\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e12mm (≈1\/2\") – 150mm (≈5-7\/8\"); see variant options for full list\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Type\u003c\/th\u003e\n\u003ctd\u003eFull Thread (shorter lengths) \/ Partial Thread (longer lengths) — see variant name\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eISO Metric Coarse (DIN 603 compatible)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Pitch\u003c\/th\u003e\n\u003ctd\u003eM8: 1.25mm | M10: 1.5mm | M12: 1.75mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eCarbon steel with zinc electroplating\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eZinc-plated (silver\/bright)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eIncluded Hardware\u003c\/th\u003e\n\u003ctd\u003eCarriage bolts + matching zinc-plated hex nuts (quantity per pack)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePack Sizes\u003c\/th\u003e\n\u003ctd\u003e2, 5, 10, 20, 25, 50, 100 pieces\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eStrength Grade\u003c\/th\u003e\n\u003ctd\u003eSee variant options \/ Contact us to confirm for specific grade requirements\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCorrosion Resistance\u003c\/th\u003e\n\u003ctd\u003eModerate — suitable for indoor and covered outdoor use\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eRound dome (mushroom head)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eDrive Type\u003c\/th\u003e\n\u003ctd\u003eNo drive — tightened from nut side only\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-note\"\u003e\n    \u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e\n    \u003cstrong\u003eHeads up:\u003c\/strong\u003e Zinc-plated fasteners are not recommended for direct burial, saltwater exposure, or pressure-treated lumber containing copper-based preservatives (ACQ\/CA). For those environments, consider hot-dip galvanized or stainless steel alternatives.\n  \u003c\/div\u003e\n\n  \u003c!-- ⑤ FAQ --\u003e\n  \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-faq\"\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right bolt length for my project?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA general rule is to add the thickness of all materials being joined, then add at least 1–2 thread pitches beyond the nut. For example, joining two 20mm (≈3\/4\") boards typically calls for a bolt of at least 50mm (≈2\"): 40mm of material plus room for the nut and washer. When in doubt, size up — a bolt that's slightly long is easier to work with than one that's too short.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the difference between full thread and partial thread carriage bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eFull-thread bolts are threaded along their entire shank and are generally used for thinner materials or where maximum thread engagement is needed. Partial-thread bolts have a smooth shank section near the head that locks into the material, reducing the chance of the joint rotating under load — typically preferred for thicker timber connections such as deck ledger boards or post-to-beam joints.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these carriage bolts suitable for outdoor use?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThe zinc-plated finish provides moderate corrosion resistance, making these bolts suitable for covered outdoor structures, interior framing, and dry exterior environments. For prolonged direct exposure to rain, coastal air, or pressure-treated lumber with copper-based preservatives (ACQ\/CA), a hot-dip galvanized or stainless steel fastener is generally recommended for long-term durability.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat thread standard do these bolts use — are they compatible with standard metric nuts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eYes. These bolts follow the ISO metric coarse thread standard (DIN 603 \/ DIN 934 compatible). M8 bolts use a 1.25mm pitch, M10 a 1.5mm pitch, and M12 a 1.75mm pitch. They are compatible with standard metric hex nuts, flat washers, and lock washers available at any hardware store.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow much load can these carriage bolts handle?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eLoad capacity depends on the bolt diameter, length, material grade, and installation method. These zinc-plated steel bolts are generally rated at Grade 4.8 or equivalent tensile strength. For structural or load-bearing applications — such as deck ledger connections or pergola post bases — consult a structural engineer and verify the grade marking on the bolt head before specifying.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDo the hex nuts come included, and are washers included too?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eYes — each set includes matching zinc-plated hex nuts. The quantity of nuts corresponds to the number of bolts in your selected pack (e.g., a 10-piece pack includes 10 bolts and 10 nuts). Washers are \u003cstrong\u003enot included\u003c\/strong\u003e and should be sourced separately if your application requires them.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhich diameter should I choose — M8, M10, or M12?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eM8 bolts are commonly used for light-to-medium timber framing, furniture assembly, and general DIY projects. M10 is a step up for heavier structural connections such as deck framing, gate hardware, or pergola rafters. M12 is typically chosen for heavy-duty applications like post bases, machinery mounting, or load-bearing brackets. When in doubt, check the specification of the bracket or hardware you are fastening to — it will usually call out the required bolt diameter.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003c!-- ⑥ CTA BAR --\u003e\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your size and quantity above, then add to cart — ships from our US warehouse.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M8 \/ 12mm \/ 10PCS","offer_id":52308521124114,"sku":"WBJHHZUV002LS041x1","price":6.8,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 16mm \/ 10PCS","offer_id":52308521156882,"sku":"WBJHHZUV002LS042x1","price":7.21,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 20mm \/ 10PCS","offer_id":52308521189650,"sku":"WBJHHZUV002LS043x1","price":7.68,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 25mm \/ 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5PCS","offer_id":52308521451794,"sku":"WBJHHZUV002LS051x1","price":6.46,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 65mm \/ 5PCS","offer_id":52308521484562,"sku":"WBJHHZUV002LS052x1","price":6.73,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 70mm \/ 5PCS","offer_id":52308521517330,"sku":"WBJHHZUV002LS053x1","price":7.0,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 75mm \/ 5PCS","offer_id":52308521550098,"sku":"WBJHHZUV002LS054x1","price":7.21,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 80mm \/ 5PCS","offer_id":52308521582866,"sku":"WBJHHZUV002LS055x1","price":7.68,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 90mm \/ 5PCS","offer_id":52308521615634,"sku":"WBJHHZUV002LS056x1","price":8.16,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 100mm \/ 5PCS","offer_id":52308521648402,"sku":"WBJHHZUV002LS057x1","price":8.84,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 110mm \/ 5PCS","offer_id":52308521681170,"sku":"WBJHHZUV002LS058x1","price":9.38,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 120mm \/ 5PCS","offer_id":52308521713938,"sku":"WBJHHZUV002LS059x1","price":10.06,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 130mm \/ 2PCS","offer_id":52308521746706,"sku":"WBJHHZUV002LS060x1","price":4.83,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 140mm \/ 2PCS","offer_id":52308521779474,"sku":"WBJHHZUV002LS061x1","price":5.1,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 150mm \/ 2PCS","offer_id":52308521812242,"sku":"WBJHHZUV002LS062x1","price":5.3,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 20mm \/ 5PCS","offer_id":52308521845010,"sku":"WBJHHZUV002LS063x1","price":6.73,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 25mm \/ 5PCS","offer_id":52308521877778,"sku":"WBJHHZUV002LS064x1","price":7.0,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 30mm \/ 5PCS","offer_id":52308521910546,"sku":"WBJHHZUV002LS065x1","price":7.48,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 35mm \/ 5PCS","offer_id":52308521943314,"sku":"WBJHHZUV002LS066x1","price":7.96,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 40mm \/ 5PCS","offer_id":52308521976082,"sku":"WBJHHZUV002LS067x1","price":8.36,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 45mm \/ 5PCS","offer_id":52308522008850,"sku":"WBJHHZUV002LS068x1","price":8.84,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 50mm \/ 5PCS","offer_id":52308522041618,"sku":"WBJHHZUV002LS069x1","price":9.32,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 55mm \/ 5PCS","offer_id":52308522074386,"sku":"WBJHHZUV002LS070x1","price":9.72,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 60mm \/ 5PCS","offer_id":52308522107154,"sku":"WBJHHZUV002LS071x1","price":10.2,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 65mm \/ 5PCS","offer_id":52308522139922,"sku":"WBJHHZUV002LS072x1","price":10.68,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 70mm \/ 5PCS","offer_id":52308522172690,"sku":"WBJHHZUV002LS073x1","price":11.08,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 75mm \/ 5PCS","offer_id":52308522205458,"sku":"WBJHHZUV002LS074x1","price":11.56,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 80mm \/ 5PCS","offer_id":52308522238226,"sku":"WBJHHZUV002LS075x1","price":12.1,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 90mm \/ 5PCS","offer_id":52308522270994,"sku":"WBJHHZUV002LS076x1","price":12.92,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 100mm \/ 2PCS","offer_id":52308522303762,"sku":"WBJHHZUV002LS077x1","price":5.98,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 110mm \/ 2PCS","offer_id":52308522336530,"sku":"WBJHHZUV002LS078x1","price":6.32,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 120mm \/ 2PCS","offer_id":52308522369298,"sku":"WBJHHZUV002LS079x1","price":6.66,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 130mm \/ 2PCS","offer_id":52308522402066,"sku":"WBJHHZUV002LS080x1","price":7.0,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 140mm \/ 2PCS","offer_id":52308522434834,"sku":"WBJHHZUV002LS081x1","price":7.41,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 150mm \/ 2PCS","offer_id":52308522467602,"sku":"WBJHHZUV002LS082x1","price":7.75,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 25mm \/ 5PCS","offer_id":52308522500370,"sku":"WBJHHZUV002LS083x1","price":11.42,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 30mm \/ 5PCS","offer_id":52308522533138,"sku":"WBJHHZUV002LS084x1","price":12.1,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 35mm \/ 5PCS","offer_id":52308522565906,"sku":"WBJHHZUV002LS085x1","price":12.72,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 40mm \/ 5PCS","offer_id":52308522598674,"sku":"WBJHHZUV002LS086x1","price":13.33,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 45mm \/ 2PCS","offer_id":52308522631442,"sku":"WBJHHZUV002LS087x1","price":5.98,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 50mm \/ 2PCS","offer_id":52308522664210,"sku":"WBJHHZUV002LS088x1","price":6.26,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 55mm \/ 2PCS","offer_id":52308522696978,"sku":"WBJHHZUV002LS089x1","price":6.53,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 60mm \/ 2PCS","offer_id":52308522729746,"sku":"WBJHHZUV002LS090x1","price":6.73,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 70mm \/ 2PCS","offer_id":52308522762514,"sku":"WBJHHZUV002LS091x1","price":7.21,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 75mm \/ 2PCS","offer_id":52308522795282,"sku":"WBJHHZUV002LS092x1","price":7.55,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 80mm \/ 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the nut — typically 1.5× the bolt diameter. For example, joining two 15mm boards with M6 bolts, a 35mm (≈1-3\/8\\u201d) length is generally sufficient. Always add a washer if the material is soft.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the load capacity of these carriage bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Load capacity depends on bolt diameter, length, material grade, and joint design. These zinc-plated steel bolts are generally rated for standard structural and woodworking loads. For safety-critical applications, consult an engineer and verify the grade marking on the bolt head.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can these bolts be used outdoors or in wet environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The zinc plating provides moderate corrosion resistance suitable for covered outdoor use or occasional moisture exposure. For fully exposed outdoor or marine environments, stainless steel or hot-dip galvanized bolts are generally recommended.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What thread standard do these bolts use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These bolts follow the ISO metric thread standard (M4, M5, M6) with standard coarse pitch. M4 pitch is typically 0.7mm, M5 is 0.8mm, and M6 is 1.0mm. The included hex nuts are matched to the same metric standard.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between full thread and partial thread variants?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Full thread bolts are threaded along the entire shank, providing maximum grip in thinner materials. Partial thread bolts have a smooth shank section near the head — the square neck locks into wood to prevent spinning, while the unthreaded shank provides a cleaner bearing surface in thicker assemblies. Longer M6 variants (55mm–100mm) in this listing are partial thread.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do the hex nuts come included with every order?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Each pack includes matching zinc-plated hex nuts in the same quantity as the bolts. The nuts are pre-matched to the bolt thread size so no separate hardware purchase is needed for basic assembly.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Which size should I choose for deck or fence construction?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"For typical deck rail or fence panel connections, M6 bolts in the 30mm–50mm range are commonly used for 2× lumber. For heavier structural connections or post-to-beam joints, longer partial-thread M6 variants (55mm–100mm) are generally more appropriate. Always verify with local building codes.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003c!-- ① OVERVIEW --\u003e\n  \u003ch2\u003eM4 M5 M6 Carriage Bolts with Hex Nuts — Zinc-Plated Steel for Reliable Wood \u0026amp; Metal Fastening\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003cp\u003eWhether you're building a backyard deck, assembling a fence panel, or tackling a furniture repair, loose or mismatched fasteners slow everything down. These zinc-plated carriage bolts are designed for woodworkers, contractors, and serious DIYers who need a dependable metric bolt that seats flush, resists spinning, and holds tight without extra hardware hunting.\u003c\/p\u003e\n    \u003cp\u003eEach pack includes matching zinc-plated hex nuts in the same count as the bolts — no separate nut order required. Available in M4, M5, and M6 diameters with lengths ranging from 8mm (≈5\/16\") to 100mm (≈3-15\/16\"). Shorter lengths (up to 50mm for M6) feature full thread for maximum grip in thinner stock; longer M6 variants (55mm–100mm) use partial thread with a smooth shank for cleaner bearing in thicker assemblies. The classic round cup head and square neck lock into wood on installation, preventing the bolt from spinning while you tighten the nut.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include timber frame connections and post-to-rail joints, flat-pack furniture assembly and repair, light structural brackets in workshops and garages, and general-purpose metric fastening where a flush, snag-free head profile is needed.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- ② COMPATIBILITY BAR --\u003e\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e\n    \u003cstrong\u003eThread Standard:\u003c\/strong\u003e ISO Metric Coarse — M4 (0.7mm pitch) · M5 (0.8mm pitch) · M6 (1.0mm pitch). Hex nuts included are matched to the same standard. Compatible with standard metric washers and lock nuts.\n  \u003c\/div\u003e\n\n  \u003c!-- ③ KEY FEATURES --\u003e\n  \u003ch2\u003e✅ Key Features of These Zinc-Plated Metric Carriage Bolts\u003c\/h2\u003e\n  \u003cul class=\"hdiy-features\"\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔒\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eAnti-Spin Square Neck\u003c\/strong\u003e — The square shoulder under the round head bites into wood on installation, keeping the bolt stationary so you can tighten the hex nut single-handed without a second wrench.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eZinc-Plated Finish\u003c\/strong\u003e — Electroplated zinc coating provides a corrosion-resistant barrier suitable for indoor and covered outdoor applications, extending service life compared to bare steel fasteners.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eWide Size Range\u003c\/strong\u003e — M4, M5, and M6 diameters with 40 distinct length options from 8mm (≈5\/16\") to 100mm (≈3-15\/16\") cover the majority of woodworking and light structural fastening needs in a single listing.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔗\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFull \u0026amp; Partial Thread Options\u003c\/strong\u003e — Full-thread variants maximize grip in thinner materials; partial-thread variants provide a smooth shank bearing surface for thicker timber connections — choose the right engagement for your joint.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eBulk Pack Quantities\u003c\/strong\u003e — Available in 10, 20, 50, 100, 200, and 500-piece packs so you can order exactly what a single job needs or stock up for ongoing projects without overpaying for excess hardware.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eMatched Hex Nuts Included\u003c\/strong\u003e — Every pack ships with the same quantity of metric hex nuts, pre-matched to the bolt thread size, so you have a complete fastener set ready to install straight out of the bag.\u003c\/span\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003c!-- ④ TECHNICAL SPECIFICATIONS --\u003e\n  \u003ch2\u003e📐 Technical Specifications — Metric Carriage Bolts (M4 \/ M5 \/ M6)\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eRound Cup (Carriage \/ Coach Bolt)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eNeck Style\u003c\/th\u003e\n\u003ctd\u003eSquare Shoulder (anti-spin)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eISO Metric Coarse\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Diameters\u003c\/th\u003e\n\u003ctd\u003eM4 · M5 · M6\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Pitch\u003c\/th\u003e\n\u003ctd\u003eM4: 0.7mm · M5: 0.8mm · M6: 1.0mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e8mm (≈5\/16\") – 100mm (≈3-15\/16\") — see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Type\u003c\/th\u003e\n\u003ctd\u003eFull Thread (M4 all lengths; M5 all lengths; M6 8–50mm) · Partial Thread (M6 55–100mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eCarbon Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eZinc Electroplated\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eIncluded Hardware\u003c\/th\u003e\n\u003ctd\u003eMatching zinc-plated hex nuts (same qty as bolts)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePack Quantities\u003c\/th\u003e\n\u003ctd\u003e10 \/ 20 \/ 50 \/ 100 \/ 200 \/ 250 \/ 500 Pcs — see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eDrive \/ Installation\u003c\/th\u003e\n\u003ctd\u003eWrench on hex nut (no driver needed on bolt head)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCorrosion Resistance\u003c\/th\u003e\n\u003ctd\u003eModerate — suitable for indoor \u0026amp; covered outdoor use\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-note\"\u003e\n    \u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e\n    \u003cstrong\u003eHeads up:\u003c\/strong\u003e Zinc-plated bolts are not recommended for direct burial, marine environments, or pressure-treated lumber without additional corrosion protection. For those applications, consider stainless steel or hot-dip galvanized hardware.\n  \u003c\/div\u003e\n\n  \u003c!-- ⑤ FAQ --\u003e\n  \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-faq\"\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right bolt length for my project?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA general rule: the bolt length should equal the combined thickness of all materials being joined, plus enough thread engagement for the nut — typically 1.5× the bolt diameter. For example, joining two 15mm boards with M6 bolts, a 35mm (≈1-3\/8\") length is generally sufficient. Always add a washer if the material is soft wood or composite.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the load capacity of these carriage bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eLoad capacity depends on bolt diameter, length, material grade, and joint design. These zinc-plated steel bolts are generally rated for standard structural and woodworking loads. For safety-critical applications (e.g., load-bearing decks, playground equipment), consult a structural engineer and verify the grade marking on the bolt head.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan these bolts be used outdoors or in wet environments?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThe zinc plating provides moderate corrosion resistance suitable for covered outdoor use or occasional moisture exposure (e.g., a sheltered pergola or indoor workshop). For fully exposed outdoor installations, direct ground contact, or marine environments, stainless steel or hot-dip galvanized bolts are generally recommended.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat thread standard do these bolts use — are they compatible with standard metric nuts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eYes. These bolts follow the ISO metric coarse thread standard. M4 pitch is typically 0.7mm, M5 is 0.8mm, and M6 is 1.0mm. The included hex nuts are matched to the same standard, and the bolts are also compatible with standard metric washers, lock nuts, and wing nuts of the same diameter.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the difference between the full thread and partial thread variants?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eFull thread bolts are threaded along the entire shank, providing maximum grip in thinner materials and shorter lengths. Partial thread bolts have a smooth shank section near the head — the square neck locks into wood to prevent spinning, while the unthreaded shank provides a cleaner bearing surface in thicker assemblies. In this listing, M6 bolts 55mm and longer are partial thread; all M4 and M5 bolts are full thread.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDo the hex nuts come included with every order?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eYes. Each pack includes matching zinc-plated hex nuts in the same quantity as the bolts. The nuts are pre-matched to the bolt thread size so no separate hardware purchase is needed for basic assembly. If you need washers, those are sold separately.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhich size should I choose for deck or fence construction?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eFor typical deck rail or fence panel connections through 2× lumber (≈38mm \/ 1-1\/2\" actual thickness), M6 bolts in the 30mm–50mm range are commonly used. For heavier structural connections or post-to-beam joints through 4× or doubled lumber, longer partial-thread M6 variants (55mm–100mm) are generally more appropriate. Always verify fastener requirements with local building codes.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003c!-- ⑥ CTA BAR --\u003e\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your size and quantity above, then add to cart — ships from our US warehouse.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M4 \/ 8mm \/ 50PCS","offer_id":52308528824594,"sku":"WBJHHZUV002LS001x1","price":6.32,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 10mm \/ 50PCS","offer_id":52308528857362,"sku":"WBJHHZUV002LS002x1","price":6.66,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 12mm \/ 20PCS","offer_id":52308528890130,"sku":"WBJHHZUV002LS003x1","price":3.26,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 16mm \/ 20PCS","offer_id":52308528922898,"sku":"WBJHHZUV002LS004x1","price":3.47,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 20mm \/ 20PCS","offer_id":52308528955666,"sku":"WBJHHZUV002LS005x1","price":3.6,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 25mm \/ 20PCS","offer_id":52308528988434,"sku":"WBJHHZUV002LS006x1","price":3.88,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 30mm \/ 20PCS","offer_id":52308529021202,"sku":"WBJHHZUV002LS007x1","price":4.15,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 35mm \/ 20PCS","offer_id":52308529053970,"sku":"WBJHHZUV002LS008x1","price":4.42,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 40mm \/ 20PCS","offer_id":52308529086738,"sku":"WBJHHZUV002LS009x1","price":4.69,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 45mm \/ 20PCS","offer_id":52308529119506,"sku":"WBJHHZUV002LS010x1","price":5.03,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 50mm \/ 20PCS","offer_id":52308529152274,"sku":"WBJHHZUV002LS011x1","price":5.3,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 10mm \/ 50PCS","offer_id":52308529185042,"sku":"WBJHHZUV002LS012x1","price":9.25,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 12mm \/ 20PCS","offer_id":52308529217810,"sku":"WBJHHZUV002LS013x1","price":4.35,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 16mm \/ 20PCS","offer_id":52308529250578,"sku":"WBJHHZUV002LS014x1","price":4.69,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 20mm \/ 20PCS","offer_id":52308529283346,"sku":"WBJHHZUV002LS015x1","price":5.1,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 25mm \/ 20PCS","offer_id":52308529316114,"sku":"WBJHHZUV002LS016x1","price":5.3,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 30mm \/ 20PCS","offer_id":52308529348882,"sku":"WBJHHZUV002LS017x1","price":5.71,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 35mm \/ 20PCS","offer_id":52308529381650,"sku":"WBJHHZUV002LS018x1","price":6.39,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 40mm \/ 20PCS","offer_id":52308529414418,"sku":"WBJHHZUV002LS019x1","price":6.66,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 45mm \/ 20PCS","offer_id":52308529447186,"sku":"WBJHHZUV002LS020x1","price":7.14,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 50mm \/ 20PCS","offer_id":52308529479954,"sku":"WBJHHZUV002LS021x1","price":7.48,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 10mm \/ 20PCS","offer_id":52308529512722,"sku":"WBJHHZUV002LS022x1","price":6.32,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 12mm \/ 20PCS","offer_id":52308529545490,"sku":"WBJHHZUV002LS023x1","price":6.6,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 14mm \/ 20PCS","offer_id":52308529578258,"sku":"WBJHHZUV002LS024x1","price":6.8,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 16mm \/ 20PCS","offer_id":52308529611026,"sku":"WBJHHZUV002LS025x1","price":7.0,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 20mm \/ 20PCS","offer_id":52308529643794,"sku":"WBJHHZUV002LS026x1","price":7.48,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 25mm \/ 20PCS","offer_id":52308529676562,"sku":"WBJHHZUV002LS027x1","price":8.16,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 30mm \/ 20PCS","offer_id":52308529709330,"sku":"WBJHHZUV002LS028x1","price":8.77,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 35mm \/ 20PCS","offer_id":52308529742098,"sku":"WBJHHZUV002LS029x1","price":9.38,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 40mm \/ 20PCS","offer_id":52308529774866,"sku":"WBJHHZUV002LS030x1","price":10.0,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 45mm \/ 20PCS","offer_id":52308529807634,"sku":"WBJHHZUV002LS031x1","price":10.61,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 50mm \/ 10PCS","offer_id":52308529840402,"sku":"WBJHHZUV002LS032x1","price":5.98,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 55mm \/ 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[\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose the right length for my carriage bolt?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Generally, the bolt length should equal the total thickness of the materials being joined plus enough thread engagement for the nut — typically at least 1× the bolt diameter. For example, joining two 20mm boards with an M8 bolt would typically require at least a 50mm (≈2\\\")-long bolt to allow for the nut and washer.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What strength grade are these carriage bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These bolts are manufactured to A2-70 specification, which generally indicates a minimum tensile strength of 700 MPa and a proof load suitable for most structural and general-purpose fastening applications.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these carriage bolts suitable for outdoor or marine use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A2 stainless steel offers good corrosion resistance and is generally suitable for outdoor environments including garden structures, decking, and fencing. For highly aggressive marine or coastal environments, A4 (316) stainless steel is typically recommended.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What thread standard do these bolts use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These carriage bolts use standard ISO metric coarse thread (M8, M10, or M12), compatible with standard metric nuts and washers of the same diameter.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the black finish on these bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The black finish is typically a black oxide or passivation treatment applied over the A2 stainless steel base. It provides a dark aesthetic appearance while the underlying stainless steel maintains corrosion resistance.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do I need a special tool to install carriage bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"No special tools are required. The square shank under the domed head is designed to embed into wood or soft material when tightened, preventing the bolt from spinning. You only need a wrench or socket on the nut side to tighten.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these bolts with metal or non-wood materials?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Carriage bolts are primarily designed for wood-to-wood or wood-to-metal connections where the square neck can grip the material. For metal-to-metal applications, a standard hex bolt is generally more appropriate since the square neck may not seat properly in hard materials.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003c!-- ① Overview --\u003e\n  \u003ch2\u003eM8 M10 M12 Black Carriage Bolts — Secure, Corrosion-Resistant Fastening for Wood and Structural Projects\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003cp\u003eWhether you're building a backyard deck, assembling a pergola, or reinforcing a fence post, finding a fastener that holds firm without rusting out after a single season is a real challenge. These M8, M10, and M12 black carriage bolts are built for DIYers, contractors, and woodworkers who need a reliable, weather-resistant connection without the guesswork.\u003c\/p\u003e\n    \u003cp\u003eEach bolt features a classic cup square domed head (also called a round head with square neck) machined from A2-70 stainless steel with a black finish. The square shank beneath the dome locks into timber to prevent spinning during tightening — no second wrench needed on the bolt side. Available in M8, M10, and M12 thread diameters with lengths ranging from 12mm (≈1\/2\") to 100mm (≈3-15\/16\"), sold in flexible quantities from 1 to 50 pieces per order.\u003c\/p\u003e\n    \u003cp\u003eTypical applications include timber frame construction and deck board fastening, garden furniture assembly and outdoor play equipment, fence rail and gate hinge mounting, and structural wood-to-wood or wood-to-metal connections where a flush, tamper-resistant head is required.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- ② Compatibility bar --\u003e\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e\n    \u003cstrong\u003eThread Compatibility:\u003c\/strong\u003e Standard ISO metric coarse thread — fits all M8, M10, or M12 metric nuts and washers. Verify your nut size before ordering.\n  \u003c\/div\u003e\n\n  \u003c!-- ③ Key Features --\u003e\n  \u003ch2\u003e✅ Key Features of These Black Carriage Bolts\u003c\/h2\u003e\n  \u003cul class=\"hdiy-features\"\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eA2-70 Stainless Steel Construction\u003c\/strong\u003e — Manufactured to A2-70 specification with a minimum tensile strength of 700 MPa, delivering dependable holding power for structural wood fastening applications.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⬛\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eBlack Finish for a Clean Look\u003c\/strong\u003e — The black oxide-style finish gives these cup square carriage bolts a sleek, low-profile appearance that blends naturally into dark timber, powder-coated steel, and painted surfaces.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔒\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eAnti-Spin Square Neck Design\u003c\/strong\u003e — The square shank directly under the domed head embeds into wood when drawn tight, eliminating bolt rotation so you can torque the nut with a single wrench — ideal for one-person installation.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eWide Size Range: M8 to M12, 12–100mm\u003c\/strong\u003e — Three thread diameters and lengths from 12mm (≈1\/2\") to 100mm (≈3-15\/16\") cover the majority of deck, fence, and furniture fastening scenarios without needing multiple product SKUs.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🌧️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eCorrosion-Resistant for Outdoor Use\u003c\/strong\u003e — A2 stainless steel resists rust and oxidation in outdoor environments including garden structures, decking, and fencing — a practical choice for exterior wood-to-wood connections.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e — Order exactly what your project needs: available in 1, 2, 5, 10, 20, 25, or 50-piece packs, so you're not stuck with excess hardware or scrambling for a single replacement bolt.\u003c\/span\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003c!-- ④ Technical Specifications --\u003e\n  \u003ch2\u003e📐 Technical Specifications — Cup Square Domed Head Carriage Bolts\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eCup Square Domed (Round Head with Square Neck)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eISO Metric Coarse (M8, M10, M12)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Diameters\u003c\/th\u003e\n\u003ctd\u003eM8 (8mm \/ ≈5\/16\"), M10 (10mm \/ ≈3\/8\"), M12 (12mm \/ ≈1\/2\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003eM8: 12–100mm (≈1\/2\"–3-15\/16\") · M10: 16–100mm (≈5\/8\"–3-15\/16\") · M12: 20–100mm (≈3\/4\"–3-15\/16\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eA2 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eStrength Grade\u003c\/th\u003e\n\u003ctd\u003eA2-70 (min. tensile strength 700 MPa)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish \/ Color\u003c\/th\u003e\n\u003ctd\u003eBlack (black oxide-style over stainless steel base)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eDrive Style\u003c\/th\u003e\n\u003ctd\u003eNo drive required — square neck self-locks in wood\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCompatible Nut\u003c\/th\u003e\n\u003ctd\u003eStandard ISO metric hex nut (M8 \/ M10 \/ M12)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePack Quantities\u003c\/th\u003e\n\u003ctd\u003e1, 2, 5, 10, 20, 25, or 50 pieces (select above)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eRecommended Use\u003c\/th\u003e\n\u003ctd\u003eWood-to-wood and wood-to-metal structural connections\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Diameter (approx.)\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSquare Neck Size\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-note\"\u003e\n    \u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e\n    \u003cstrong\u003eSizing Note:\u003c\/strong\u003e Length is measured from under the head to the tip of the thread. Always confirm total material thickness before selecting a length. Contact us to confirm head and neck dimensions for your specific size.\n  \u003c\/div\u003e\n\n  \u003c!-- ⑤ FAQ --\u003e\n  \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-faq\"\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right length for my carriage bolt?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eGenerally, the bolt length should equal the total thickness of the materials being joined, plus enough thread engagement for the nut — typically at least 1× the bolt diameter. For example, joining two 20mm boards with an M8 bolt would typically require at least a 50mm (≈2\") bolt to allow for the nut and washer. When in doubt, size up by one increment.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat strength grade are these carriage bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese bolts are manufactured to the A2-70 specification, which generally indicates a minimum tensile strength of 700 MPa and a proof load suitable for most structural and general-purpose fastening applications. This makes them appropriate for deck construction, timber framing, and similar load-bearing uses.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these carriage bolts suitable for outdoor or marine use?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA2 stainless steel offers good corrosion resistance and is generally suitable for outdoor environments including garden structures, decking, and fencing. For highly aggressive marine or coastal environments where salt spray is constant, A4 (316) stainless steel is typically recommended for longer service life.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat thread standard do these bolts use, and what nuts are compatible?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese carriage bolts use standard ISO metric coarse thread (M8, M10, or M12). They are compatible with any standard metric hex nut and flat washer of the matching diameter. No special or proprietary hardware is required.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the black finish, and will it affect corrosion resistance?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThe black finish is typically a black oxide or passivation treatment applied over the A2 stainless steel base. It provides a dark aesthetic appearance while the underlying stainless steel maintains its inherent corrosion resistance. In most cases, minor surface scratches will not compromise the bolt's rust resistance since the stainless steel substrate remains intact.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDo I need a special tool to install these carriage bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eNo special tools are required. The square shank under the domed head is designed to embed into wood or soft material when the nut is tightened, preventing the bolt from spinning. You only need a standard wrench or socket on the nut side. This makes them particularly convenient for single-person installation in timber applications.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use these bolts with metal or composite materials instead of wood?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eCarriage bolts are primarily designed for wood-to-wood or wood-to-metal connections where the square neck can grip and embed into the softer material. For metal-to-metal applications, a standard hex bolt is generally more appropriate since the square neck may not seat properly in hard materials and could spin freely. For composite decking, check whether the material is soft enough to allow the neck to seat — in most cases it will work, but a test fit is recommended.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003c!-- ⑥ CTA bar --\u003e\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your size and quantity above, then add to cart — ships from our US warehouse.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M8 \/ 12mm \/ 5PCS","offer_id":52308533215506,"sku":"WBJHHZUV003LS038x1","price":4.15,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 16mm \/ 5PCS","offer_id":52308533248274,"sku":"WBJHHZUV003LS039x1","price":4.28,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 20mm \/ 5PCS","offer_id":52308533281042,"sku":"WBJHHZUV003LS040x1","price":4.69,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 25mm \/ 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50PCS","offer_id":52308535836946,"sku":"WBJHHZUV003LS040x10","price":40.05,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 25mm \/ 50PCS","offer_id":52308535869714,"sku":"WBJHHZUV003LS041x10","price":44.68,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 30mm \/ 20PCS","offer_id":52308535902482,"sku":"WBJHHZUV003LS042x10","price":20.26,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 35mm \/ 20PCS","offer_id":52308535935250,"sku":"WBJHHZUV003LS043x10","price":22.24,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 40mm \/ 20PCS","offer_id":52308535968018,"sku":"WBJHHZUV003LS044x10","price":24.48,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 45mm \/ 20PCS","offer_id":52308536000786,"sku":"WBJHHZUV003LS045x10","price":26.59,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 50mm \/ 20PCS","offer_id":52308536033554,"sku":"WBJHHZUV003LS046x10","price":28.63,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 60mm \/ 20PCS","offer_id":52308536066322,"sku":"WBJHHZUV003LS047x10","price":32.64,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 70mm \/ 20PCS","offer_id":52308536099090,"sku":"WBJHHZUV003LS048x10","price":35.02,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 80mm \/ 20PCS","offer_id":52308536131858,"sku":"WBJHHZUV003LS049x10","price":38.35,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 90mm \/ 10PCS","offer_id":52308536164626,"sku":"WBJHHZUV003LS050x10","price":21.08,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 100mm \/ 10PCS","offer_id":52308536197394,"sku":"WBJHHZUV003LS051x10","price":22.71,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 16mm \/ 20PCS","offer_id":52308536230162,"sku":"WBJHHZUV003LS052x10","price":27.0,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 20mm \/ 20PCS","offer_id":52308536262930,"sku":"WBJHHZUV003LS053x10","price":28.29,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 25mm \/ 20PCS","offer_id":52308536295698,"sku":"WBJHHZUV003LS054x10","price":30.46,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 30mm \/ 20PCS","offer_id":52308536328466,"sku":"WBJHHZUV003LS055x10","price":33.59,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 35mm \/ 10PCS","offer_id":52308536361234,"sku":"WBJHHZUV003LS056x10","price":18.7,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 40mm \/ 10PCS","offer_id":52308536394002,"sku":"WBJHHZUV003LS057x10","price":20.33,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 45mm \/ 10PCS","offer_id":52308536426770,"sku":"WBJHHZUV003LS058x10","price":21.9,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 50mm \/ 10PCS","offer_id":52308536459538,"sku":"WBJHHZUV003LS059x10","price":23.46,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 60mm \/ 10PCS","offer_id":52308536492306,"sku":"WBJHHZUV003LS060x10","price":26.93,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 70mm \/ 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10PCS","offer_id":52308536754450,"sku":"WBJHHZUV003LS068x10","price":30.33,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 40mm \/ 10PCS","offer_id":52308536787218,"sku":"WBJHHZUV003LS069x10","price":32.64,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 45mm \/ 10PCS","offer_id":52308536819986,"sku":"WBJHHZUV003LS070x10","price":34.95,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 50mm \/ 10PCS","offer_id":52308536852754,"sku":"WBJHHZUV003LS071x10","price":37.2,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 60mm \/ 10PCS","offer_id":52308536885522,"sku":"WBJHHZUV003LS072x10","price":41.82,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 70mm \/ 10PCS","offer_id":52308536918290,"sku":"WBJHHZUV003LS073x10","price":45.42,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 80mm \/ 10PCS","offer_id":52308536951058,"sku":"WBJHHZUV003LS074x10","price":48.96,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 90mm \/ 10PCS","offer_id":52308536983826,"sku":"WBJHHZUV003LS075x10","price":51.54,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 100mm \/ 10PCS","offer_id":52308537016594,"sku":"WBJHHZUV003LS076x10","price":54.74,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/2_45_f6de9bc7-e922-4e9f-acd2-84f1f5a7c567.jpg?v=1780501929"},{"product_id":"black-carriage-bolts-grade-8-8-m6-m24-cup-square","title":"Black Carriage Bolts Grade 8.8 | M6–M24 Cup Square Domed Head Screws","description":"\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose the right bolt length for my project?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A general rule: add the thickness of all materials being joined, then add approximately 1–2 thread pitches beyond the nut. For example, joining two 10mm boards with an M8 bolt typically requires at least 25–30mm (about 1–1.2 inches). Always measure your stack-up before ordering. Our variants range from 20mm (≈0.79\\u2033) to 150mm (≈5.91\\u2033).\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does Grade 8.8 mean for carriage bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Grade 8.8 is a medium-high tensile strength classification under ISO 898-1. It indicates a minimum tensile strength of 800 MPa and a yield strength of 640 MPa, making these bolts suitable for structural and load-bearing applications where standard hardware-grade fasteners would be insufficient.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these carriage bolts suitable for outdoor or wet environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These bolts feature a black oxide finish, which provides mild corrosion resistance and is generally suitable for indoor or sheltered outdoor use. For prolonged outdoor exposure or high-humidity environments, we recommend applying a protective coating or sealant after installation, or contacting us to confirm suitability for your specific conditions.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What thread standard do these carriage bolts use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These bolts use standard ISO metric coarse threads (M6 through M24), which are compatible with standard metric nuts and threaded inserts. They are not compatible with UNC\/UNF inch-standard fasteners. Always verify thread pitch before pairing with existing hardware.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between full thread and part thread variants?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Full thread bolts are threaded along the entire shank length, providing maximum grip in thinner materials or when threading into a nut close to the head. Part thread bolts have a smooth shank section near the head — this unthreaded portion typically provides better shear resistance and is preferred for thicker assemblies where the bolt passes through a clearance hole before engaging the nut.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I install a carriage bolt correctly?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Drill a clearance hole matching the bolt diameter through your material. Insert the bolt from the front (domed head side). The square neck under the head will bite into wood or soft material to prevent rotation. Apply a washer and nut on the back side, then tighten with a wrench. For metal or hard materials, a square hole or anti-rotation plate may be needed.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Which size should I choose for deck or fence construction?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"For typical deck or fence rail connections using 2x lumber (≈38mm\/1.5\\u2033 thick), M10 or M12 bolts in the 80–100mm range are generally appropriate. For post-to-beam connections, M12–M16 in 120–150mm lengths are more commonly used. Always consult local building codes for structural fastener requirements.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eBlack Carriage Bolts Grade 8.8 — Reliable Fastening for Structural \u0026amp; DIY Applications\u003c\/h2\u003e\n    \u003cp\u003eWhen a standard bolt just won't hold — whether you're building a deck, assembling heavy timber frames, or securing metal brackets — you need a fastener with a clean look and real holding power. These black carriage bolts are designed for contractors, woodworkers, and serious DIYers who need a tamper-resistant, load-bearing bolt that installs flush and stays put.\u003c\/p\u003e\n    \u003cp\u003eEach bolt features a domed cup square head with a square neck that locks into wood or soft material to prevent rotation during tightening. Available in metric sizes M6 through M24, with lengths ranging from 20mm (≈0.79\") to 150mm (≈5.91\"), in both full thread and part thread configurations. Sold in flexible pack sizes from 1 to 100 pieces to suit single repairs or bulk projects.\u003c\/p\u003e\n    \u003cp\u003eThese black carriage bolts are well-suited for timber deck construction, fence post assembly, playground equipment fastening, and structural woodworking joints — anywhere you need a metric carriage bolt with a clean black finish and dependable Grade 8.8 tensile strength.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e\n    \u003cstrong\u003eCompatibility:\u003c\/strong\u003e ISO metric coarse thread (M6–M24). Pairs with standard metric hex nuts and washers. Not compatible with UNC\/UNF inch-standard hardware. Verify thread pitch before combining with existing fasteners.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e✅ Key Features of These Black Grade 8.8 Carriage Bolts\u003c\/h2\u003e\n  \u003cul class=\"hdiy-features\"\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e💪\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eGrade 8.8 High Tensile Strength\u003c\/strong\u003e — Meets ISO 898-1 with a minimum tensile strength of 800 MPa, making these bolts suitable for structural timber connections and load-bearing assemblies where standard hardware-grade fasteners fall short.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔲\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eCup Square Anti-Rotation Neck\u003c\/strong\u003e — The square shoulder under the domed head bites into wood and soft materials during installation, eliminating the need to hold the bolt head while tightening — a key advantage for single-person assembly.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🖤\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eBlack Oxide Finish\u003c\/strong\u003e — The uniform black finish provides mild corrosion resistance and a clean, low-profile appearance that blends into dark timber, painted steel, and powder-coated surfaces without standing out.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eWide Size Range — M6 to M24\u003c\/strong\u003e — With thread diameters from M6 (≈0.24\") to M24 (≈0.94\") and lengths from 20mm to 150mm, these black carriage bolts cover the majority of residential and light commercial fastening needs in a single product line.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔀\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFull Thread \u0026amp; Part Thread Options\u003c\/strong\u003e — Full thread variants maximize grip in thinner materials; part thread variants provide a smooth shank for better shear resistance in thicker assemblies — select the right configuration for your specific joint design.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e — Available in packs of 1, 2, 5, 10, 20, 25, 50, and 100 pieces, so you can order exactly what your project requires without overstocking or making multiple trips to the hardware store.\u003c\/span\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003e📐 Technical Specifications — Black Carriage Bolts M6–M24\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eBolt Type\u003c\/th\u003e\n\u003ctd\u003eCarriage Bolt (Cup Square Domed Head)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eISO Metric Coarse (DIN 603 \/ ISO 8677)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Diameter Range\u003c\/th\u003e\n\u003ctd\u003eM6 – M24\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eLength Range\u003c\/th\u003e\n\u003ctd\u003e20mm (≈0.79\") – 150mm (≈5.91\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Type\u003c\/th\u003e\n\u003ctd\u003eFull thread and Part thread (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eCarbon steel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eStrength Grade\u003c\/th\u003e\n\u003ctd\u003eGrade 8.8 (ISO 898-1)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTensile Strength\u003c\/th\u003e\n\u003ctd\u003e800 MPa (minimum)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eYield Strength\u003c\/th\u003e\n\u003ctd\u003e640 MPa (minimum)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eBlack oxide\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eDomed (mushroom) with square neck\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eDrive Style\u003c\/th\u003e\n\u003ctd\u003eNo drive — tightened from nut side only\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCompatible Nut Standard\u003c\/th\u003e\n\u003ctd\u003eISO metric hex nut (M6–M24)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePack Sizes Available\u003c\/th\u003e\n\u003ctd\u003e1, 2, 5, 10, 20, 25, 50, 100 pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-note\"\u003e\n    \u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e\n    \u003cstrong\u003eNote:\u003c\/strong\u003e Thread pitch varies by diameter. If you are pairing these bolts with existing nuts or threaded inserts, please contact us to confirm the pitch for your selected size before ordering.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-faq\"\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right bolt length for my project?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA general rule: add the thickness of all materials being joined, then add approximately 1–2 thread pitches beyond the nut. For example, joining two 10mm boards with an M8 bolt typically requires at least 25–30mm (about 1–1.2\"). Always measure your stack-up before ordering. Our variants range from 20mm (≈0.79\") to 150mm (≈5.91\").\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat does Grade 8.8 mean for carriage bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eGrade 8.8 is a medium-high tensile strength classification under ISO 898-1. It indicates a minimum tensile strength of 800 MPa and a yield strength of 640 MPa, making these bolts suitable for structural and load-bearing applications where standard hardware-grade fasteners would be insufficient.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these carriage bolts suitable for outdoor or wet environments?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese bolts feature a black oxide finish, which provides mild corrosion resistance and is generally suitable for indoor or sheltered outdoor use. For prolonged outdoor exposure or high-humidity environments, we recommend applying a protective coating or sealant after installation, or contacting us to confirm suitability for your specific conditions.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat thread standard do these carriage bolts use?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese bolts use standard ISO metric coarse threads (M6 through M24), which are compatible with standard metric nuts and threaded inserts. They are not compatible with UNC\/UNF inch-standard fasteners. Always verify thread pitch before pairing with existing hardware.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the difference between full thread and part thread variants?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eFull thread bolts are threaded along the entire shank length, providing maximum grip in thinner materials or when threading into a nut close to the head. Part thread bolts have a smooth shank section near the head — this unthreaded portion typically provides better shear resistance and is preferred for thicker assemblies where the bolt passes through a clearance hole before engaging the nut.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I install a carriage bolt correctly?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eDrill a clearance hole matching the bolt diameter through your material. Insert the bolt from the front (domed head side). The square neck under the head will bite into wood or soft material to prevent rotation. Apply a washer and nut on the back side, then tighten with a wrench. For metal or hard materials, a square hole or anti-rotation plate may be needed.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhich size should I choose for deck or fence construction?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eFor typical deck or fence rail connections using 2x lumber (≈38mm\/1.5\" thick), M10 or M12 bolts in the 80–100mm range are generally appropriate. For post-to-beam connections, M12–M16 in 120–150mm lengths are more commonly used. Always consult local building codes for structural fastener requirements.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your \u003cstrong\u003esize and quantity\u003c\/strong\u003e above, then add to cart — ships from our US warehouse.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M6 \/ 20mm \/ 20PCS","offer_id":52308537082130,"sku":"WBJHHZUV005LS001x1","price":9.37,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 25mm \/ 20PCS","offer_id":52308537114898,"sku":"WBJHHZUV005LS002x1","price":10.19,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 30mm \/ 10PCS","offer_id":52308537147666,"sku":"WBJHHZUV005LS003x1","price":6.11,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 35mm \/ 10PCS","offer_id":52308537180434,"sku":"WBJHHZUV005LS004x1","price":6.46,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 40mm \/ 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\"Question\",\n      \"name\": \"How do I choose the right bolt length?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Generally, add the thickness of all materials being joined plus the nut height, then add 1–2 thread pitches of extra engagement. For example, joining two 10mm boards with an M8 bolt typically requires at least 25mm (≈1\\\"): 20mm material + ~5mm nut. When in doubt, size up.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What thread standard do these carriage bolts use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These bolts follow the ISO metric coarse thread standard (DIN 603 profile). M5 is typically 0.8mm pitch, M6 is 1.0mm, M8 is 1.25mm, M10 is 1.5mm, and M12 is 1.75mm. The included nuts are matched to the same metric coarse thread.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can these bolts be used outdoors or in wet environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"201 stainless steel offers good corrosion resistance for general outdoor use and occasional moisture exposure. For marine or highly corrosive environments, 316 stainless steel is generally recommended. These bolts are suitable for decks, fences, garden furniture, and similar applications.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the load-bearing capacity of these bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"201 stainless steel carriage bolts typically have a tensile strength of around 500–700 MPa depending on diameter and heat treatment. For structural or safety-critical applications, always consult an engineer and verify the specific grade rating. These are generally suited for light-to-medium structural connections.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How does the cup square (carriage bolt) head work?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The domed head sits flush and smooth on the surface, while the square shank section directly beneath the head bites into wood or soft material to prevent the bolt from spinning during tightening. This allows you to tighten the nut from one side without needing to hold the bolt head.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do the nuts included match the bolt thread size?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Each set includes matching metric hex nuts sized to the bolt diameter. M5 bolts come with M5 nuts, M6 with M6 nuts, and so on. All nuts follow the same ISO metric coarse thread standard as the bolts.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What sizes and quantities are available?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Bolts are available in M5, M6, M8, M10, and M12 diameters, with lengths ranging from 12mm (≈1\/2\\\") to 100mm (≈3-15\/16\\\"). Pack quantities range from 1 to 50 pieces depending on size, allowing you to buy exactly what your project needs.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eM5–M12 Stainless Steel Carriage Bolts with Nuts — Secure, Smooth-Head Fastening for Wood \u0026amp; Metal\u003c\/h2\u003e\n    \u003cp\u003eWhen you need a fastener that stays put without an exposed drive recess on the face side, standard hex bolts fall short. Woodworkers, deck builders, furniture makers, and general contractors reach for carriage bolts precisely because the domed head leaves a clean, snag-free surface while the square shank locks the bolt in place — no second wrench needed on the bolt side.\u003c\/p\u003e\n    \u003cp\u003eEach set includes one M5–M12 carriage bolt and one matching metric hex nut, both made from 201 stainless steel. Bolt diameters span M5 through M12; lengths run from 12mm (≈1\/2\") to 100mm (≈3-15\/16\"). Pack quantities range from 1 to 50 pieces so you can match your exact project volume. The square neck under the domed head measures proportionally to the bolt diameter per DIN 603 geometry.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include deck rail connections, outdoor furniture assembly, timber frame joints, gate hardware, and DIY workshop jigs — anywhere you need a flush-face fastener that resists loosening under vibration. The ISO metric coarse thread profile ensures compatibility with standard metric hex nuts and lock nuts available at any hardware store.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e\n    \u003cstrong\u003eThread Compatibility:\u003c\/strong\u003e ISO Metric Coarse Thread (DIN 603) — M5 × 0.8 \/ M6 × 1.0 \/ M8 × 1.25 \/ M10 × 1.5 \/ M12 × 1.75. Matching hex nuts included. Compatible with standard metric washers and lock nuts.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-note\"\u003e\n    \u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e\n    \u003cstrong\u003eConfirm your size before ordering:\u003c\/strong\u003e Measure material thickness and add nut height + 1–2 thread pitches of engagement. If you are unsure which length fits your application, contact us to confirm before purchasing.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e✅ Key Features of These M5–M12 Stainless Steel Carriage Bolts\u003c\/h2\u003e\n  \u003cul class=\"hdiy-features\"\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔘\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eCup Square Domed Head\u003c\/strong\u003e — The smooth, rounded head leaves a clean surface finish with no exposed drive recess, reducing snag points on furniture, decking, and playground equipment.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔒\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eAnti-Rotation Square Neck\u003c\/strong\u003e — The square shank section beneath the head locks into wood or soft substrates, letting you tighten the nut single-handed without the bolt spinning.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🌊\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e201 Stainless Steel Construction\u003c\/strong\u003e — Resists rust and surface oxidation in outdoor, humid, and light-moisture environments — suitable for deck connections, garden furniture, and exterior timber framing.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eWide Size Range: M5 to M12, 12–100mm\u003c\/strong\u003e — Covers the most common metric carriage bolt sizes for DIY and light commercial work, from small furniture joints up to heavy timber connections.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eMatched Hex Nut Included\u003c\/strong\u003e — Every bolt ships with a same-grade, same-thread metric hex nut, so you have a complete fastener set ready to install without sourcing hardware separately.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e — Available in 1, 2, 3, 5, 6, 10, 15, 25, 30, and 50-piece packs, so you can buy exactly what your project requires without overstocking.\u003c\/span\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003e📐 Technical Specifications — M5–M12 Carriage Bolts\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eCarriage Bolt (Cup Square Domed Head) with Hex Nut\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eCup Square \/ Domed (Round Head, Square Neck)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eDrive Style\u003c\/th\u003e\n\u003ctd\u003eNone (anti-rotation square neck — tighten from nut side only)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eISO Metric Coarse (DIN 603)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Diameters\u003c\/th\u003e\n\u003ctd\u003eM5, M6, M8, M10, M12\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e12mm (≈1\/2\") – 100mm (≈3-15\/16\"); see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Pitch\u003c\/th\u003e\n\u003ctd\u003eM5: 0.8mm \/ M6: 1.0mm \/ M8: 1.25mm \/ M10: 1.5mm \/ M12: 1.75mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e201 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural stainless (brushed\/mill finish)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eIncluded Hardware\u003c\/th\u003e\n\u003ctd\u003e1× Carriage Bolt + 1× Matching Metric Hex Nut per piece\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e1 \/ 2 \/ 3 \/ 5 \/ 6 \/ 10 \/ 15 \/ 25 \/ 30 \/ 50 Pcs — see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCorrosion Resistance\u003c\/th\u003e\n\u003ctd\u003eGood for outdoor\/humid environments; not rated for marine\/saltwater immersion\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTensile Strength (typical)\u003c\/th\u003e\n\u003ctd\u003eTypically 500–700 MPa (contact us to confirm for structural applications)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-faq\"\u003e\n    \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right bolt length for my project?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eGenerally, add up the total thickness of all materials being clamped, then add the nut height plus 1–2 thread pitches of extra engagement beyond the nut. For example, joining two 10mm boards with an M8 bolt typically requires at least 25mm (≈1\"): 20mm of material + ~5mm nut height. When in doubt, size up one length — a bolt that's slightly long is easier to work with than one that's too short. Lengths on this listing are measured from under the head to the tip.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat thread standard do these carriage bolts use, and are they compatible with standard metric nuts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese bolts follow the ISO metric coarse thread standard (DIN 603 profile). Pitches are: M5 × 0.8mm, M6 × 1.0mm, M8 × 1.25mm, M10 × 1.5mm, M12 × 1.75mm. They are compatible with any standard ISO metric coarse hex nut, lock nut, or flange nut of the matching diameter available at hardware stores.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use these bolts outdoors or in wet conditions?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003e201 stainless steel provides good corrosion resistance for general outdoor use, including decks, fences, garden furniture, and exterior timber framing exposed to rain and humidity. It is generally not recommended for continuous saltwater immersion or highly corrosive marine environments — for those applications, 316 stainless steel is typically the better choice. For most residential outdoor DIY projects, 201 SS performs well.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat load or strength can these bolts handle?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003e201 stainless steel carriage bolts typically have a tensile strength in the range of 500–700 MPa depending on diameter and manufacturing process. They are generally suited for light-to-medium structural connections such as deck railings, furniture joints, and gate hardware. For safety-critical or engineered structural applications, always consult a licensed engineer and verify the specific grade rating. Contact us to confirm specifications if needed.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow does the cup square (carriage bolt) head prevent the bolt from spinning?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eDirectly beneath the domed head is a short square-profile shank section. When the bolt is inserted through a pre-drilled hole in wood or soft material and pulled tight, this square neck bites into the material and locks the bolt rotationally. This means you can tighten the nut from one side without needing to hold the bolt head — ideal for through-bolting applications where the bolt head side is inaccessible or you want a clean, tool-free face.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre the nuts included, and do they match the bolt thread?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eYes — each piece in the pack includes one carriage bolt and one matching metric hex nut. The nut is sized and threaded to match the bolt diameter exactly: M5 bolt with M5 nut, M6 with M6, and so on. All nuts follow the same ISO metric coarse thread standard as the bolts, so they are also interchangeable with other standard metric hardware.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat sizes and pack quantities are available, and how do I convert mm to inches?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eDiameters available: M5, M6, M8, M10, M12. Lengths range from 12mm to 100mm. Quick inch conversions: 12mm ≈ 1\/2\", 16mm ≈ 5\/8\", 20mm ≈ 3\/4\", 25mm ≈ 1\", 30mm ≈ 1-3\/16\", 40mm ≈ 1-9\/16\", 50mm ≈ 2\", 60mm ≈ 2-3\/8\", 80mm ≈ 3-1\/8\", 100mm ≈ 3-15\/16\". Pack sizes range from 1 to 50 pieces — select your size and quantity from the variant dropdowns above.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your size and quantity above, then add to cart — ships from our US warehouse.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M5 \/ 12mm \/ 10PCS","offer_id":52308545372434,"sku":"WBJHHZUV004LS095x1","price":2.92,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 16mm \/ 10PCS","offer_id":52308545405202,"sku":"WBJHHZUV004LS096x1","price":3.06,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 20mm \/ 10PCS","offer_id":52308545437970,"sku":"WBJHHZUV004LS097x1","price":3.26,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 25mm \/ 10PCS","offer_id":52308545470738,"sku":"WBJHHZUV004LS098x1","price":3.4,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 30mm \/ 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10PCS","offer_id":52308545732882,"sku":"WBJHHZUV004LS106x1","price":4.56,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 25mm \/ 10PCS","offer_id":52308545765650,"sku":"WBJHHZUV004LS107x1","price":4.9,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 30mm \/ 10PCS","offer_id":52308545798418,"sku":"WBJHHZUV004LS108x1","price":5.3,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 35mm \/ 10PCS","offer_id":52308545831186,"sku":"WBJHHZUV004LS109x1","price":5.64,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 40mm \/ 10PCS","offer_id":52308545863954,"sku":"WBJHHZUV004LS110x1","price":5.98,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 45mm \/ 5PCS","offer_id":52308545896722,"sku":"WBJHHZUV004LS111x1","price":3.54,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 50mm \/ 5PCS","offer_id":52308545929490,"sku":"WBJHHZUV004LS112x1","price":3.74,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 55mm \/ 5PCS","offer_id":52308545962258,"sku":"WBJHHZUV004LS113x1","price":4.01,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 60mm \/ 5PCS","offer_id":52308545995026,"sku":"WBJHHZUV004LS114x1","price":4.22,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 12mm \/ 5PCS","offer_id":52308546027794,"sku":"WBJHHZUV004LS115x1","price":4.15,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 16mm \/ 5PCS","offer_id":52308546060562,"sku":"WBJHHZUV004LS116x1","price":4.35,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 20mm \/ 5PCS","offer_id":52308546093330,"sku":"WBJHHZUV004LS117x1","price":4.56,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 25mm \/ 5PCS","offer_id":52308546126098,"sku":"WBJHHZUV004LS118x1","price":4.9,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 30mm \/ 5PCS","offer_id":52308546158866,"sku":"WBJHHZUV004LS119x1","price":5.24,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 35mm \/ 5PCS","offer_id":52308546191634,"sku":"WBJHHZUV004LS120x1","price":5.58,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 40mm \/ 5PCS","offer_id":52308546224402,"sku":"WBJHHZUV004LS121x1","price":5.92,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 45mm \/ 5PCS","offer_id":52308546257170,"sku":"WBJHHZUV004LS122x1","price":6.19,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 50mm \/ 5PCS","offer_id":52308546289938,"sku":"WBJHHZUV004LS123x1","price":6.6,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 55mm \/ 5PCS","offer_id":52308546322706,"sku":"WBJHHZUV004LS124x1","price":6.94,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 60mm \/ 5PCS","offer_id":52308546355474,"sku":"WBJHHZUV004LS125x1","price":7.28,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 65mm \/ 2PCS","offer_id":52308546388242,"sku":"WBJHHZUV004LS126x1","price":3.47,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 70mm \/ 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25PCS","offer_id":52308550779154,"sku":"WBJHHZUV004LS132x5","price":34.88,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 25mm \/ 10PCS","offer_id":52308550811922,"sku":"WBJHHZUV004LS133x5","price":15.03,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 30mm \/ 10PCS","offer_id":52308550844690,"sku":"WBJHHZUV004LS134x5","price":15.98,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 35mm \/ 10PCS","offer_id":52308550877458,"sku":"WBJHHZUV004LS135x5","price":17.0,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 40mm \/ 10PCS","offer_id":52308550910226,"sku":"WBJHHZUV004LS136x5","price":18.09,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 45mm \/ 10PCS","offer_id":52308550942994,"sku":"WBJHHZUV004LS137x5","price":19.11,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 50mm \/ 10PCS","offer_id":52308550975762,"sku":"WBJHHZUV004LS138x5","price":20.26,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 55mm \/ 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10PCS","offer_id":52308551237906,"sku":"WBJHHZUV004LS146x5","price":25.09,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 30mm \/ 10PCS","offer_id":52308551270674,"sku":"WBJHHZUV004LS147x5","price":26.38,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 35mm \/ 10PCS","offer_id":52308551303442,"sku":"WBJHHZUV004LS148x5","price":27.88,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 40mm \/ 5PCS","offer_id":52308551336210,"sku":"WBJHHZUV004LS149x5","price":15.03,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 45mm \/ 5PCS","offer_id":52308551368978,"sku":"WBJHHZUV004LS150x5","price":15.78,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 50mm \/ 5PCS","offer_id":52308551401746,"sku":"WBJHHZUV004LS151x5","price":16.66,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 55mm \/ 5PCS","offer_id":52308551434514,"sku":"WBJHHZUV004LS152x5","price":17.34,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 60mm \/ 5PCS","offer_id":52308551467282,"sku":"WBJHHZUV004LS153x5","price":18.16,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 65mm \/ 5PCS","offer_id":52308551500050,"sku":"WBJHHZUV004LS154x5","price":19.04,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 70mm \/ 5PCS","offer_id":52308551532818,"sku":"WBJHHZUV004LS155x5","price":19.92,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 80mm \/ 5PCS","offer_id":52308551565586,"sku":"WBJHHZUV004LS156x5","price":21.69,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 90mm \/ 5PCS","offer_id":52308551598354,"sku":"WBJHHZUV004LS157x5","price":23.05,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 100mm \/ 5PCS","offer_id":52308551631122,"sku":"WBJHHZUV004LS158x5","price":24.82,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/2_70.jpg?v=1780501929"},{"product_id":"m4-m5-m6-m8-stainless-steel-carriage-bolts-a2-din-603","title":"M4 M5 M6 M8 Stainless Steel Carriage Bolts | A2 Cup Square Screws DIN 603","description":"\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\"@type\":\"Question\",\"name\":\"How do I choose the right carriage bolt length?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"As a general rule, the bolt should be long enough to pass through all materials being joined plus at least one full nut thickness. For example, joining two 20mm boards typically requires a bolt of at least 50mm. Always add 5-10mm of thread engagement beyond the nut for a secure hold.\"}},\n    {\"@type\":\"Question\",\"name\":\"What thread standard do these carriage bolts use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"These bolts follow the ISO metric coarse thread standard per DIN 603. M4, M5, M6, and M8 refer to the nominal thread diameter in millimeters. They are compatible with standard ISO metric hex nuts and flat washers of the corresponding size.\"}},\n    {\"@type\":\"Question\",\"name\":\"Are these carriage bolts suitable for outdoor or marine use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. A2 stainless steel (304 grade) offers good corrosion resistance in most outdoor environments including rain, humidity, and mild coastal exposure. For highly aggressive marine or saltwater environments, A4 (316) stainless is generally recommended.\"}},\n    {\"@type\":\"Question\",\"name\":\"What is the tensile strength of these A2 stainless carriage bolts?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A2-70 stainless steel carriage bolts typically have a minimum tensile strength of 700 MPa. This makes them suitable for structural wood connections, furniture assembly, and general construction where moderate load-bearing is required.\"}},\n    {\"@type\":\"Question\",\"name\":\"What is the difference between a carriage bolt and a hex bolt?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A carriage bolt (DIN 603) has a smooth domed head and a square shank section beneath it that bites into wood to prevent rotation during tightening. A hex bolt has a hexagonal head requiring a wrench on both ends. Carriage bolts are preferred for wood-to-wood and wood-to-metal connections where a clean finish is desired.\"}},\n    {\"@type\":\"Question\",\"name\":\"Can I use these bolts with a washer and nut?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. These carriage bolts are designed to be used with a standard ISO metric flat washer and hex nut on the threaded end. The square neck under the head locks into the material, so you only need to tighten the nut from one side.\"}},\n    {\"@type\":\"Question\",\"name\":\"How many bolts come in each pack?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"You can choose from pack quantities of 2, 5, 10, 20, 50, or 100 bolts. Larger packs offer a lower per-unit cost and are ideal for bulk projects like deck building, fencing, or furniture production.\"}},\n    {\"@type\":\"Question\",\"name\":\"Will the square neck work in materials other than wood?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The anti-rotation square neck is designed primarily for wood and soft composite materials where it can embed and grip. In metal or hard plastics, the square neck generally does not bite in. For wood-to-metal connections, the square neck grips the wood layer while the bolt passes through a pre-drilled hole in the metal.\"}}\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eStainless Steel Carriage Bolts (DIN 603) — Secure, Rust-Resistant Fasteners for Wood \u0026amp; Structural Projects\u003c\/h2\u003e\n\u003cp\u003eStripped threads, rusted heads, and bolts that spin freely in the hole — these are the frustrations that slow down any build. Whether you're a contractor framing a deck, a woodworker assembling furniture, or a DIYer tackling a weekend fence project, you need fasteners that grip, hold, and last. These A2 stainless steel carriage bolts are built for exactly that.\u003c\/p\u003e\n\u003cp\u003eEach bolt conforms to \u003cstrong\u003eDIN 603\u003c\/strong\u003e (cup square head standard) and is manufactured from \u003cstrong\u003eA2 stainless steel (304 grade)\u003c\/strong\u003e. The smooth domed head sits flush and clean on the surface, while the square shank section beneath locks into wood to prevent rotation during tightening. Available in thread diameters of \u003cstrong\u003eM4, M5, M6, and M8\u003c\/strong\u003e, with lengths ranging from \u003cstrong\u003e10mm (approx. 3\/8\") to 80mm (approx. 3-1\/8\")\u003c\/strong\u003e. Pack quantities of 2, 5, 10, 20, 50, or 100 let you order exactly what your project requires.\u003c\/p\u003e\n\u003cp\u003eTypical applications include \u003cstrong\u003edeck and fence construction\u003c\/strong\u003e, \u003cstrong\u003eoutdoor furniture assembly\u003c\/strong\u003e, \u003cstrong\u003etimber framing\u003c\/strong\u003e, and \u003cstrong\u003eplayground equipment fastening\u003c\/strong\u003e — anywhere a clean bolt head and reliable anti-rotation grip are needed. These stainless steel carriage bolts for wood are a go-to choice for builders who want corrosion-resistant fasteners without sacrificing holding strength.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Fits standard ISO metric nuts and washers — M4, M5, M6, and M8. Thread pitch follows DIN 603 \/ ISO metric coarse thread standard. Confirm your material thickness before selecting bolt length.\n\u003c\/div\u003e\n\n\u003ch2\u003e✅ Key Features of These Stainless Steel Carriage Bolts\u003c\/h2\u003e\n\u003cul class=\"hdiy-features\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eA2 Stainless Steel Construction\u003c\/strong\u003e — Made from 304-grade stainless steel, these cup square carriage bolts resist rust, oxidation, and surface staining in outdoor and humid environments.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔒\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eAnti-Rotation Square Neck\u003c\/strong\u003e — The square shank under the domed head bites into wood or soft materials, preventing the bolt from spinning while you tighten the nut — no second wrench needed.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eWide Size Range\u003c\/strong\u003e — Available in M4 through M8 diameters and lengths from 10mm to 80mm, covering the most common stainless steel carriage bolt sizes for deck building, fencing, and furniture work.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e — Order in packs of 2, 5, 10, 20, 50, or 100 to match your project scale, from single repairs to bulk construction runs.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e✅\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eDIN 603 Standard Compliance\u003c\/strong\u003e — Manufactured to DIN 603 specification, ensuring consistent head geometry, thread pitch, and dimensional accuracy across all sizes.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🪵\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eClean Domed Head Finish\u003c\/strong\u003e — The smooth, low-profile round head leaves a tamper-resistant, snag-free surface — ideal for outdoor furniture, decking, and anywhere aesthetics matter alongside function.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003e📐 Technical Specifications — Stainless Steel Carriage Bolts DIN 603\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eStandard\u003c\/th\u003e\n\u003ctd\u003eDIN 603 (Cup Square Carriage Bolt)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eA2 Stainless Steel (304 Grade)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Diameters\u003c\/th\u003e\n\u003ctd\u003eM4, M5, M6, M8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e10mm (approx. 3\/8\") to 80mm (approx. 3-1\/8\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Type\u003c\/th\u003e\n\u003ctd\u003eISO Metric Coarse Thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eRound Dome (Cup Square \/ Mushroom Head)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNeck Style\u003c\/th\u003e\n\u003ctd\u003eSquare Shank (Anti-Rotation)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural Stainless (No Coating)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTensile Strength\u003c\/th\u003e\n\u003ctd\u003eTypically 700 MPa (A2-70 grade)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Fasteners\u003c\/th\u003e\n\u003ctd\u003eISO Metric Hex Nuts and Flat Washers (M4–M8)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantities\u003c\/th\u003e\n\u003ctd\u003e2 \/ 5 \/ 10 \/ 20 \/ 50 \/ 100 pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-note\"\u003e\n\u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e\n\u003cstrong\u003eNote:\u003c\/strong\u003e Bolt length is measured from under the head to the tip of the thread. Always verify your material stack thickness before ordering. If you need a size not listed, contact us to confirm availability.\n\u003c\/div\u003e\n\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right carriage bolt length?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAs a general rule, the bolt should be long enough to pass through all materials being joined plus at least one full nut thickness. For example, joining two 20mm (approx. 3\/4\") boards typically requires a bolt of at least 50mm (approx. 2\"). Always add 5–10mm of thread engagement beyond the nut for a secure hold. Bolt length on DIN 603 carriage bolts is measured from under the head to the tip.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat thread standard do these carriage bolts use?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese bolts follow the \u003cstrong\u003eISO metric coarse thread standard\u003c\/strong\u003e per DIN 603. M4, M5, M6, and M8 refer to the nominal thread diameter in millimeters. They are compatible with standard ISO metric hex nuts and flat washers of the corresponding size, which are widely available at hardware stores across the US.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eAre these carriage bolts suitable for outdoor or marine use?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. A2 stainless steel (304 grade) generally offers good corrosion resistance in most outdoor environments including rain, humidity, and mild coastal exposure. For highly aggressive marine or saltwater environments, A4 (316) stainless is typically recommended. These bolts are well-suited for decking, fencing, pergolas, and outdoor furniture in most US climates.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the tensile strength of these A2 stainless carriage bolts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA2-70 stainless steel carriage bolts typically have a minimum tensile strength of \u003cstrong\u003e700 MPa (approx. 101,500 psi)\u003c\/strong\u003e. This makes them suitable for structural wood connections, timber framing, furniture assembly, and general construction where moderate load-bearing is required. For heavy structural applications, consult an engineer for load calculations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between a carriage bolt and a hex bolt?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA carriage bolt (DIN 603) has a smooth domed head and a square shank section beneath it that bites into wood to prevent rotation during tightening — no wrench needed on the bolt head. A hex bolt has a hexagonal head requiring a wrench on both ends. Carriage bolts are preferred for wood-to-wood and wood-to-metal connections where a clean, tamper-resistant finish is desired.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these bolts with a washer and nut?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. These carriage bolts are designed to be used with a standard ISO metric flat washer and hex nut on the threaded end. The square neck under the head locks into the material, so you only need to tighten the nut from one side. Using a washer is recommended to distribute load and protect the surface finish of your workpiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow many bolts come in each pack, and which quantity is right for me?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYou can choose from pack quantities of \u003cstrong\u003e2, 5, 10, 20, 50, or 100 bolts\u003c\/strong\u003e. Packs of 2–5 are ideal for small repairs or prototyping. Packs of 10–20 suit typical furniture or gate projects. Packs of 50–100 offer the best per-unit value for deck construction, fencing runs, or production woodworking.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWill the square neck work in materials other than wood?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe anti-rotation square neck is designed primarily for wood and soft composite materials where it can embed and grip. In metal or hard plastics, the square neck generally does not bite in — in those cases, you would typically need to hold the bolt head with a tool or use a different fastener type. For wood-to-metal connections, the square neck grips the wood layer while the bolt passes through a pre-drilled hole in the metal.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-cta\"\u003e\n🛒 Select your \u003cstrong\u003ebolt size and pack quantity\u003c\/strong\u003e above, then add to cart — ships from our US warehouse.\n\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M4 \/ 10mm \/ 2PCS","offer_id":52308552122642,"sku":"YMXVKA7710x2","price":1.48,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 12mm \/ 2PCS","offer_id":52308552155410,"sku":"YMXVKA7711x2","price":1.7,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 14mm \/ 2PCS","offer_id":52308552188178,"sku":"YMXVKA7712x2","price":1.7,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 16mm \/ 2PCS","offer_id":52308552220946,"sku":"YMXVKA7713x2","price":1.7,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 18mm \/ 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For example, joining two 10mm (≈3\/8\\u201d) boards with M6 bolts, a 25mm (≈1\\u201d) bolt is generally sufficient. Always measure your stack-up before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the tensile strength of A2 stainless steel carriage bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A2 stainless steel (ISO 3506 property class A2-70) typically has a minimum tensile strength of 700 MPa (≈101,500 psi). This makes them suitable for general structural and joinery applications. For heavy-load or safety-critical uses, consult an engineer.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can these carriage bolts be used outdoors?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. A2 stainless steel offers good corrosion resistance in most outdoor environments, including rain and humidity. For coastal or marine environments with heavy salt exposure, A4 (316) stainless steel is generally recommended instead.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What thread standard do these bolts use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These are metric coarse-thread bolts conforming to ISO 8677 \/ DIN 603. M4 typically has a 0.7mm pitch, M5 a 0.8mm pitch, and M6 a 1.0mm pitch. They are compatible with standard metric hex nuts and wing nuts of the same size.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do I need a washer with carriage bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A flat washer under the nut is generally recommended to distribute clamping load and protect the surface finish. The dome head on the bolt side sits flush and does not typically require a washer, but one can be added for softer materials.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How does the square neck prevent the bolt from spinning?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The square section directly under the dome head is designed to embed into wood or soft material as the nut is tightened. This locks the bolt in place so you can tighten the nut with one hand — no need to hold the bolt head with a wrench.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Which pack size should I order for a project?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"For small repairs or prototypes, packs of 5–10 are cost-effective. For furniture builds or deck projects, packs of 50–100 offer better per-unit value. Bulk packs of 200–500 are suited for contractors or production runs where consistent sizing is needed across many joints.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eM4 M5 M6 Carriage Bolts — A2 Stainless Steel with Reliable Anti-Spin Grip\u003c\/h2\u003e\n    \u003cp\u003eWhether you're assembling outdoor furniture, building a deck, or fastening structural timber, finding a bolt that stays put while you tighten the nut is half the battle. These M4 M5 M6 carriage bolts are designed for woodworkers, DIYers, and contractors who need a clean, tamper-resistant fastener that works the first time — without a second set of hands.\u003c\/p\u003e\n    \u003cp\u003eEach bolt features a smooth dome head and a square neck shank machined from A2 stainless steel (equivalent to 304 SS). Thread diameters cover M4, M5, and M6 with lengths ranging from 10mm (≈3\/8\") up to 60mm (≈2-3\/8\"), available in pack quantities from 2 to 500 pieces. Thread pitch follows ISO metric coarse standards: M4 at 0.7mm, M5 at 0.8mm, and M6 at 1.0mm.\u003c\/p\u003e\n    \u003cp\u003eTypical applications include timber deck construction with M6 x 40–60mm bolts, flat-pack furniture assembly using M4 x 10–16mm fasteners, and gate or fence panel joinery where M5 x 20–30mm carriage bolts provide a clean exterior finish without exposed drive recesses.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e\n    \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Fits standard metric hex nuts, nylon-insert lock nuts, and wing nuts in M4, M5, and M6. Square neck embeds into wood and soft composites. Not recommended for use in pre-drilled metal without a square-hole adapter.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e✅ Key Features of These M4 M5 M6 Stainless Steel Carriage Bolts\u003c\/h2\u003e\n  \u003cul class=\"hdiy-features\"\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔒\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eAnti-Spin Square Neck\u003c\/strong\u003e — The square shank section bites into wood as the nut is tightened, holding the bolt stationary so you can fasten one-handed without a wrench on the head.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🌊\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eA2 Stainless Steel Construction\u003c\/strong\u003e — Resists rust and oxidation in outdoor, humid, and wet environments; suitable for garden structures, decking, and exterior joinery exposed to rain and moisture.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eWide Size Range\u003c\/strong\u003e — M4, M5, and M6 thread diameters with lengths from 10mm to 60mm cover the most common metric carriage bolt sizes for timber and composite panel applications.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e✨\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eSmooth Dome Head Finish\u003c\/strong\u003e — The low-profile rounded head sits flush against the surface, leaving a clean, snag-free exterior face — ideal for furniture, playground equipment, and visible joinery.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e — Order from 2 to 500 pieces per size; bulk packs of 100–500 reduce per-unit cost for contractors and production furniture makers needing consistent metric fastener stock.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eISO Metric Coarse Thread\u003c\/strong\u003e — Conforms to DIN 603 \/ ISO 8677 standards, ensuring compatibility with off-the-shelf metric nuts, washers, and threaded inserts available at any hardware store.\u003c\/span\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003e📐 Technical Specifications — M4 M5 M6 Carriage Bolts\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eCarriage Bolt (Cup \/ Square \/ Dome Head)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eStandard\u003c\/th\u003e\n\u003ctd\u003eDIN 603 \/ ISO 8677\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eA2 Stainless Steel (304 equivalent)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Diameters\u003c\/th\u003e\n\u003ctd\u003eM4, M5, M6\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Pitch\u003c\/th\u003e\n\u003ctd\u003eM4: 0.7mm | M5: 0.8mm | M6: 1.0mm (ISO metric coarse)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003eM4: 10–30mm (≈3\/8\"–1-3\/16\") | M5: 10–50mm (≈3\/8\"–2\") | M6: 12–60mm (≈1\/2\"–2-3\/8\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eDome (round\/cup) with square neck\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eDrive Style\u003c\/th\u003e\n\u003ctd\u003eNone (nut-driven; square neck prevents rotation)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural stainless (no coating)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePack Quantities\u003c\/th\u003e\n\u003ctd\u003e2, 5, 10, 20, 30, 50, 100, 200, 500 pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCorrosion Resistance\u003c\/th\u003e\n\u003ctd\u003eGood — suitable for outdoor\/humid environments; see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCompatible Nuts\u003c\/th\u003e\n\u003ctd\u003eStandard metric hex nuts, lock nuts, wing nuts (M4 \/ M5 \/ M6)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-note\"\u003e\n    \u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e\n    \u003cstrong\u003eSizing note:\u003c\/strong\u003e Carriage bolt length is measured from under the dome head to the tip of the thread. Confirm your material stack-up thickness before selecting a length. If you need a size not listed, contact us.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-faq\"\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right length for my carriage bolt?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA general rule: the bolt length should equal the combined thickness of all materials being joined, plus enough thread engagement for the nut — typically at least 1× the thread diameter beyond the last material. For example, joining two 10mm (≈3\/8\") boards with M6 bolts, a 25mm (≈1\") bolt is generally sufficient. Always measure your stack-up before ordering.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the tensile strength of these A2 stainless steel bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA2 stainless steel to ISO 3506 property class A2-70 typically has a minimum tensile strength of 700 MPa (≈101,500 psi). This is generally adequate for furniture, decking, and general structural joinery. For safety-critical or high-load applications, consult a structural engineer.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use these carriage bolts outdoors?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eYes. A2 stainless steel resists rust and oxidation well in most outdoor conditions including rain, humidity, and garden environments. For coastal or marine locations with heavy salt spray, A4 (316) stainless steel is generally the better choice for long-term corrosion resistance.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat thread standard do these bolts follow, and which nuts are compatible?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese bolts conform to DIN 603 \/ ISO 8677 metric coarse thread. M4 has a 0.7mm pitch, M5 has a 0.8mm pitch, and M6 has a 1.0mm pitch. They are compatible with any standard metric hex nut, nylon-insert lock nut, or wing nut of the matching size available at hardware stores.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDo I need a washer with these carriage bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA flat washer under the nut is generally recommended to spread the clamping load and protect the surface. The dome head on the bolt side sits flush and does not typically require a washer, though one can be added when fastening softer or more compressible materials like plywood or composite decking.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow does the square neck stop the bolt from spinning when I tighten the nut?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThe square section directly beneath the dome head is designed to embed into wood or soft composite material as the nut is tightened. This mechanical lock holds the bolt stationary, so you can drive the nut with one hand without needing to grip the head — a key advantage of the carriage bolt design over standard hex bolts.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhich pack size is right for my project?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eFor small repairs or prototyping, packs of 5–10 pieces are typically cost-effective. For furniture builds or deck projects, packs of 50–100 offer better per-unit value. Bulk packs of 200–500 are suited for contractors or production runs where a consistent metric fastener size is needed across many joints.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your \u003cstrong\u003ethread size and length\u003c\/strong\u003e above, then add to cart — ships from our US warehouse.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M4 \/ 10mm \/ 10PCS","offer_id":52308561002770,"sku":"GLFBQLPBRTQJD018751x10","price":3.52,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 10mm \/ 20PCS","offer_id":52308561035538,"sku":"GLFBQLPBRTQJD018751x20","price":4.56,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 10mm \/ 30PCS","offer_id":52308561068306,"sku":"GLFBQLPBRTQJD018751x30","price":6.19,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 10mm \/ 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20PCS","offer_id":52308568441106,"sku":"GLFBQLPBRTQJD018783x20","price":24.19,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 60mm \/ 30PCS","offer_id":52308568473874,"sku":"GLFBQLPBRTQJD018783x30","price":35.62,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 60mm \/ 50PCS","offer_id":52308568506642,"sku":"GLFBQLPBRTQJD018783x50","price":58.55,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 60mm \/ 100PCS","offer_id":52308568539410,"sku":"GLFBQLPBRTQJD018783x100","price":115.8,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture1of5_d1d170e2-28d6-47a5-87a0-d25bb3172732.jpg?v=1780501929"},{"product_id":"carriage-bolts-304-stainless-steel-m4-m5-m6-m8-m10-m12","title":"Carriage Bolts 304 Stainless Steel — M4 M5 M6 M8 M10 M12 Cup Square Dome Head","description":"\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose the right carriage bolt length?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure the total thickness of all materials being joined, then add typically 5–10mm (about 3\/16\\\"–3\/8\\\") for the nut and washer. For example, joining two 20mm (≈3\/4\\\") boards requires a bolt of at least 45mm (≈1-3\/4\\\"). When in doubt, size up — a slightly longer bolt is easier to work with than one that's too short.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What thread diameter should I choose for my project?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"For light-duty wood joinery and furniture, M4 or M5 is generally sufficient. M6 and M8 are the most common choices for general construction, decking, and framing. M10 and M12 are typically used for heavy structural connections, timber framing, and load-bearing applications.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong are these carriage bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These bolts are made from 304 (A2) stainless steel, which generally provides a tensile strength of around 500–700 MPa depending on diameter and manufacturing tolerances. They are suitable for most structural wood-to-wood and wood-to-metal connections. For critical load-bearing applications, consult an engineer for exact load ratings.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these carriage bolts suitable for outdoor and marine use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. 304 stainless steel offers excellent resistance to rust and atmospheric corrosion, making these bolts well-suited for outdoor decking, fencing, pergolas, and garden structures. For highly aggressive marine environments with constant saltwater exposure, 316 stainless steel is generally recommended instead.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What thread standard do these carriage bolts use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These bolts use standard ISO metric coarse threads (DIN 603 \/ ISO 8677 equivalent). M4 through M12 sizes follow standard metric pitch specifications — for example, M6 typically has a 1.0mm pitch and M8 typically has a 1.25mm pitch. They are compatible with standard metric nuts and washers.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do I need a washer with these carriage bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Using a flat washer under the nut is generally recommended. It distributes the clamping load over a larger surface area, reduces the risk of the nut pulling through softer materials like wood, and helps prevent galvanic corrosion when used with dissimilar metals. Use a stainless steel washer to match the bolt material.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I install a carriage bolt?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Drill a clearance hole matching the bolt diameter through all materials. Insert the bolt from the front (dome head side). Tap the head flush so the square neck bites into the wood — this prevents the bolt from spinning during tightening. Place a washer and nut on the threaded end and tighten with a wrench. No tool is needed on the head side.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eCarriage Bolts 304 Stainless Steel — Secure Any Wood-to-Wood or Wood-to-Metal Joint Without Spinning\u003c\/h2\u003e\n    \u003cp\u003eIf you've ever struggled with a bolt that spins freely while you try to tighten the nut — stripping the hole and wasting time — you already know why carriage bolts exist. The self-locking square neck under the dome head bites into the material and holds firm, letting you drive the nut tight with one hand and one wrench. These 304 stainless steel carriage bolts are built for woodworkers, deck builders, fencing contractors, and DIYers who need a fastener that stays put and won't rust out in a season.\u003c\/p\u003e\n    \u003cp\u003eEach bolt is machined from 304 (A2) stainless steel with a smooth, rounded dome head and a square shank section directly beneath it. Available in thread diameters from M4 through M12 and lengths from 10mm (≈3\/8\") to 100mm (≈3-15\/16\"), with ISO metric coarse threads throughout. Order individually (1 Pcs), in small packs (5 Pcs), or in value packs (10 Pcs) to match your project quantity.\u003c\/p\u003e\n    \u003cp\u003eTypical applications include outdoor deck construction with carriage bolts through joists and beams, timber frame pergola and gazebo assembly, wood fence rail-to-post connections, playground equipment and swing set hardware, and furniture joinery where a flush, tool-free head is required on the visible face.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e\n    \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Fits standard ISO metric nuts and washers. M4–M12 coarse thread pitch. Compatible with wood, plywood, composite lumber, and light steel plate. Square neck requires a pre-drilled clearance hole matching the bolt diameter.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-note\"\u003e\n    \u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e\n    \u003cstrong\u003eNote:\u003c\/strong\u003e Confirm your required thread diameter and grip length before ordering. If you are unsure, contact us to confirm — we're happy to help you select the right size.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e✅ Key Features of These 304 Stainless Steel Carriage Bolts\u003c\/h2\u003e\n  \u003cul class=\"hdiy-features\"\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔒\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eSelf-Locking Square Neck\u003c\/strong\u003e — The square shank section under the dome head embeds into wood or soft material on installation, preventing rotation while you tighten the nut — no second tool needed on the bolt side.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🌊\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e304 Stainless Steel Construction\u003c\/strong\u003e — Resists rust, oxidation, and atmospheric corrosion, making these carriage bolts for outdoor decking, fencing, and garden structures a long-lasting choice compared to zinc-plated alternatives.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eWide Size Range — M4 to M12\u003c\/strong\u003e — Covers light furniture joinery (M4–M5) through heavy structural timber connections (M10–M12), with lengths from 10mm (≈3\/8\") to 100mm (≈3-15\/16\") to suit varying material thicknesses.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eSmooth Dome Head Profile\u003c\/strong\u003e — The rounded cup-square dome head sits flush and snag-free on the visible face of your workpiece — ideal for furniture, playground equipment, and any application where a clean, low-profile finish matters.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eISO Metric Coarse Thread\u003c\/strong\u003e — Standard metric pitch (e.g., M6×1.0, M8×1.25) ensures compatibility with off-the-shelf metric nuts, washers, and threaded inserts — no specialty hardware required.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e — Available as single pieces (1 Pcs), small packs (5 Pcs), or value packs (10 Pcs), so you can order exactly what your project needs without overstocking fasteners you won't use.\u003c\/span\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003e📐 Technical Specifications — 304 Stainless Steel Carriage Bolts\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eCarriage Bolt (Cup Square Dome Head)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e304 Stainless Steel (A2)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eDome \/ Cup Square (rounded top, square neck)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eDrive Style\u003c\/th\u003e\n\u003ctd\u003eNone — square neck self-locks into material\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eISO Metric Coarse (DIN 603 equivalent)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Diameter\u003c\/th\u003e\n\u003ctd\u003eM4, M5, M6, M8, M10, M12\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e10mm (≈3\/8\") – 100mm (≈3-15\/16\"); see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Pitch\u003c\/th\u003e\n\u003ctd\u003eM4: 0.7mm · M5: 0.8mm · M6: 1.0mm · M8: 1.25mm · M10: 1.5mm · M12: 1.75mm (standard coarse)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural stainless (brushed\/mill finish)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCorrosion Resistance\u003c\/th\u003e\n\u003ctd\u003eSuitable for outdoor and atmospheric exposure; not recommended for continuous saltwater immersion\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e1 Pcs \/ 5 Pcs \/ 10 Pcs (select above)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCompatible Hardware\u003c\/th\u003e\n\u003ctd\u003eStandard ISO metric nuts and flat washers (sold separately)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTensile Strength (typical)\u003c\/th\u003e\n\u003ctd\u003eTypically 500–700 MPa (varies by diameter; contact us to confirm for critical applications)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-faq\"\u003e\n    \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right carriage bolt length?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eMeasure the total thickness of all materials being joined, then add typically 5–10mm (about 3\/16\"–3\/8\") for the nut and washer stack. For example, joining two 20mm (≈3\/4\") boards requires a bolt of at least 45mm (≈1-3\/4\"). When in doubt, size up — a slightly longer bolt is easier to work with than one that's too short. Use the variant selector above to pick your exact length in mm; inch equivalents are listed in the specs table.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat thread diameter should I choose for my project?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eFor light-duty wood joinery and furniture, M4 or M5 is generally sufficient. M6 and M8 are the most common choices for general construction, decking, and framing. M10 and M12 are typically used for heavy structural connections, timber framing, and load-bearing applications. If you're unsure, M8 is a solid all-around starting point for most outdoor deck and fence projects.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow strong are these carriage bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese bolts are made from 304 (A2) stainless steel, which generally provides a tensile strength of around 500–700 MPa depending on diameter and manufacturing tolerances. They are suitable for most structural wood-to-wood and wood-to-metal connections. For critical load-bearing applications such as structural beams or safety-rated equipment, consult an engineer for exact load ratings specific to your configuration.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these carriage bolts suitable for outdoor and marine use?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eYes — 304 stainless steel offers excellent resistance to rust and atmospheric corrosion, making these bolts well-suited for outdoor decking, fencing, pergolas, and garden structures. For highly aggressive marine environments with constant saltwater spray or immersion, 316 stainless steel is generally recommended instead. In most coastal and outdoor residential applications, 304 performs reliably for many years.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat thread standard do these carriage bolts use, and are they compatible with standard nuts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese bolts use standard ISO metric coarse threads (DIN 603 \/ ISO 8677 equivalent). Each diameter follows standard metric pitch — M6 is typically 1.0mm pitch, M8 is typically 1.25mm pitch, M10 is typically 1.5mm pitch, and M12 is typically 1.75mm pitch. They are fully compatible with standard metric hex nuts, flange nuts, and flat washers available at any hardware store.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDo I need a washer with these carriage bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eUsing a flat washer under the nut is generally recommended. It distributes the clamping load over a larger surface area, reduces the risk of the nut pulling through softer materials like wood, and helps prevent surface damage when tightening. Use a stainless steel washer to match the bolt material and avoid galvanic corrosion. Washers are sold separately.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I install a carriage bolt correctly?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eDrill a clearance hole matching the bolt's thread diameter through all materials to be joined. Insert the bolt from the front (dome head side). Tap the head firmly with a mallet so the square neck section embeds into the wood — this is what prevents the bolt from spinning during tightening. Place a flat washer and hex nut on the threaded end and tighten with a wrench. No tool is needed on the head side once the square neck is seated.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your size and quantity above, then add to cart — ships from our US warehouse.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M4 \/ 10mm \/ 1PCS","offer_id":52308569129234,"sku":"GY$$$BRTQJD018751x1","price":1.96,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 12mm \/ 1PCS","offer_id":52308569162002,"sku":"GY$$$BRTQJD018752x1","price":1.96,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 14mm \/ 1PCS","offer_id":52308569194770,"sku":"GY$$$BRTQJD018753x1","price":1.96,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 16mm \/ 1PCS","offer_id":52308569227538,"sku":"GY$$$BRTQJD018754x1","price":1.96,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 18mm \/ 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1PCS","offer_id":52308570177810,"sku":"GY$$$BRTQJD018783x1","price":2.2,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 12mm \/ 1PCS","offer_id":52308570210578,"sku":"GY$$$BRTQJD018784x1","price":2.11,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 16mm \/ 1PCS","offer_id":52308570243346,"sku":"GY$$$BRTQJD018785x1","price":2.12,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 20mm \/ 1PCS","offer_id":52308570276114,"sku":"GY$$$BRTQJD018786x1","price":2.14,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 25mm \/ 1PCS","offer_id":52308570308882,"sku":"GY$$$BRTQJD018787x1","price":2.2,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 30mm \/ 1PCS","offer_id":52308570341650,"sku":"GY$$$BRTQJD018788x1","price":2.2,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 35mm \/ 1PCS","offer_id":52308570374418,"sku":"GY$$$BRTQJD018789x1","price":2.23,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 40mm \/ 1PCS","offer_id":52308570407186,"sku":"GY$$$BRTQJD018790x1","price":2.24,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 45mm \/ 1PCS","offer_id":52308570439954,"sku":"GY$$$BRTQJD018791x1","price":2.28,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 50mm \/ 1PCS","offer_id":52308570472722,"sku":"GY$$$BRTQJD018792x1","price":2.33,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 55mm \/ 1PCS","offer_id":52308570505490,"sku":"GY$$$BRTQJD018793x1","price":2.38,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 60mm \/ 1PCS","offer_id":52308570538258,"sku":"GY$$$BRTQJD018794x1","price":2.38,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 70mm \/ 1PCS","offer_id":52308570571026,"sku":"GY$$$BRTQJD018795x1","price":2.56,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 80mm \/ 1PCS","offer_id":52308570603794,"sku":"GY$$$BRTQJD018796x1","price":2.72,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 20mm \/ 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10PCS","offer_id":52308575453458,"sku":"GY$$$BRTQJD018804x10","price":22.37,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 60mm \/ 10PCS","offer_id":52308575486226,"sku":"GY$$$BRTQJD018805x10","price":23.88,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 70mm \/ 10PCS","offer_id":52308575518994,"sku":"GY$$$BRTQJD018806x10","price":26.86,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 80mm \/ 10PCS","offer_id":52308575551762,"sku":"GY$$$BRTQJD018807x10","price":29.85,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 90mm \/ 10PCS","offer_id":52308575584530,"sku":"GY$$$BRTQJD018808x10","price":32.87,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 100mm \/ 10PCS","offer_id":52308575617298,"sku":"GY$$$BRTQJD018809x10","price":35.81,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 30mm \/ 10PCS","offer_id":52308575650066,"sku":"GY$$$BRTQJD018810x10","price":24.04,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 35mm \/ 10PCS","offer_id":52308575682834,"sku":"GY$$$BRTQJD018811x10","price":26.11,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 40mm \/ 10PCS","offer_id":52308575715602,"sku":"GY$$$BRTQJD018812x10","price":28.23,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 45mm \/ 10PCS","offer_id":52308575748370,"sku":"GY$$$BRTQJD018813x10","price":30.36,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 50mm \/ 10PCS","offer_id":52308575781138,"sku":"GY$$$BRTQJD018814x10","price":32.5,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 55mm \/ 10PCS","offer_id":52308575813906,"sku":"GY$$$BRTQJD018815x10","price":34.64,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 60mm \/ 10PCS","offer_id":52308575846674,"sku":"GY$$$BRTQJD018816x10","price":36.79,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 70mm \/ 10PCS","offer_id":52308575879442,"sku":"GY$$$BRTQJD018817x10","price":41.14,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 80mm \/ 10PCS","offer_id":52308575912210,"sku":"GY$$$BRTQJD018818x10","price":45.34,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 90mm \/ 10PCS","offer_id":52308575944978,"sku":"GY$$$BRTQJD018819x10","price":49.69,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 100mm \/ 10PCS","offer_id":52308575977746,"sku":"GY$$$BRTQJD018820x10","price":53.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/4dbc4124-1f4b-4b46-86cd-7a53183d19e9.jpg?v=1780501929"},{"product_id":"m6-m8-square-dome-carriage-bolts-a2-304-stainless-steel","title":"M6 M8 COACHs CUP SQUARE DOME CARRIAGE BOLTS SCREWS A2 304 STAINLESS STEEL","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eM6 \u0026amp; M8 Carriage Bolts — A2 304 Stainless Steel for Lasting Outdoor and Structural Fastening\u003c\/h2\u003e\n\u003cp\u003eWhen a standard bolt strips out or rusts through mid-project, the whole build stalls. DIYers and makers working on timber frames, garden structures, decking, or enclosure assemblies need a fastener that holds its shape and its finish — even after seasons of exposure. These M6 and M8 coach cup square dome carriage bolts are machined from A2 304 stainless steel, giving you a corrosion-resistant, structurally sound fastener that won't let you down.\u003c\/p\u003e\n\u003cp\u003eEach bolt features a smooth domed cup head with a square shank section beneath it that self-locks into timber or soft materials as the nut is tightened — no wrench needed on the bolt side. Available in thread diameters of M6 and M8, with shank lengths ranging from 12 mm (approx. 0.47 in) to 80 mm (approx. 3.15 in). Pack sizes from 1 to 30 pieces let you buy exactly what the job requires.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include timber deck rail connections, garden gate hardware, wooden furniture assembly, PC case panel fastening, and aluminum extrusion frame builds where a flush, tamper-resistant head profile is needed. The square-neck carriage bolt design is a go-to for woodworkers, fabricators, and iterative makers who need a clean exterior finish with reliable clamping force.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Fits standard M6 and M8 hex nuts and washers. Square neck seats into timber, plywood, and soft composites. Not recommended for through-bolting hardened steel plate without a pre-drilled clearance hole.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Carriage Bolts\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cstrong\u003eA2 304 Stainless Steel Construction\u003c\/strong\u003e\u003cbr\u003eResists oxidation, salt spray, and moisture — suited for outdoor, marine-adjacent, and humid workshop environments without surface treatment.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔒\u003c\/span\u003e\u003cstrong\u003eSelf-Locking Square Neck\u003c\/strong\u003e\u003cbr\u003eThe square shank section beneath the dome head bites into timber and soft materials as the nut draws tight, preventing rotation without a second tool.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eWide Size Matrix\u003c\/strong\u003e\u003cbr\u003eM6 lengths from 12–60 mm and M8 lengths from 12–80 mm cover the majority of structural timber and panel fastening scenarios in a single product family.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e\u003cbr\u003eOrder 1, 2, 3, 5, 10, 15, 20, 25, or 30 pieces per pack — scale your order to the exact job size without overstocking hardware.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e✨\u003c\/span\u003e\u003cstrong\u003eSmooth Dome Cup Head Profile\u003c\/strong\u003e\u003cbr\u003eThe rounded cup head sits flush and clean on the surface, leaving a finished appearance on visible faces of furniture, gates, and panel assemblies.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\u003cstrong\u003eNo-Tool Head Installation\u003c\/strong\u003e\u003cbr\u003eDrive the nut from the back — the square neck holds the bolt stationary in the workpiece, making single-person installation straightforward on through-bolt applications.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Carriage Bolts\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eMetric (ISO)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Diameter\u003c\/th\u003e\n\u003ctd\u003eM6 \/ M8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003eM6: 12, 16, 20, 25, 30, 35, 40, 45, 50, 55, 60 mm — M8: 12, 16, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eCup \/ Dome (Round)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNeck Style\u003c\/th\u003e\n\u003ctd\u003eSquare (self-locking)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eA2 304 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eMill \/ Bright (uncoated stainless)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDrive Type\u003c\/th\u003e\n\u003ctd\u003eNone (nut-driven; square neck prevents rotation)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Pitch\u003c\/th\u003e\n\u003ctd\u003eM6: 1.0 mm — M8: 1.25 mm (standard coarse)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantities\u003c\/th\u003e\n\u003ctd\u003e1, 2, 3, 5, 10, 15, 20, 25, 30 pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCorrosion Rating\u003c\/th\u003e\n\u003ctd\u003eA2 \/ ISO 3506 — suitable for outdoor and mildly corrosive environments\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Nut\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight (per piece)\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between M6 and M8 carriage bolts, and how do I choose?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eM6 refers to a 6 mm thread diameter and M8 to an 8 mm thread diameter. M6 bolts are suited for lighter structural connections — thin timber panels, furniture joints, and enclosure hardware — while M8 bolts provide greater clamping force and shear resistance for heavier timber framing, gate hinges, and load-bearing assemblies. When in doubt, match the bolt diameter to the pre-drilled hole size in your hardware or hinge plate.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow strong are A2 304 stainless steel carriage bolts compared to zinc-plated steel?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA2 304 stainless steel has a minimum tensile strength of approximately 500 MPa (property class 50 per ISO 3506), which is comparable to a Grade 4.8 carbon steel bolt. Zinc-plated steel bolts in Grade 8.8 will be stronger in raw tensile terms, but A2 stainless offers significantly better corrosion resistance without relying on a surface coating that can chip or wear. For outdoor, coastal, or humid environments, A2 stainless is the more durable long-term choice.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWill these bolts rust or corrode outdoors?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA2 304 stainless steel forms a passive chromium oxide layer that resists rust in most outdoor and freshwater environments. It performs well in rain, humidity, and general weather exposure. For direct saltwater or chloride-heavy environments (coastal splash zones, swimming pool surrounds), A4 316 stainless would be the recommended upgrade. In standard garden, decking, and outdoor furniture applications, A2 304 provides reliable long-term corrosion resistance.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eDo I need a washer with these carriage bolts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA washer under the nut is recommended whenever the bolt passes through a material softer than the nut face — timber, plywood, or composite board. The washer distributes the clamping load over a wider area, preventing the nut from pulling through the material under load. The dome head side does not typically require a washer as the cup profile already provides a broad bearing surface against the workpiece.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat length carriage bolt should I use for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA general rule is to select a bolt length equal to the total thickness of all materials being clamped, plus enough thread engagement for the nut — typically 1.5× the bolt diameter as a minimum. For example, clamping two 18 mm timber boards (36 mm total) with an M8 bolt would call for at least a 50 mm bolt to allow the nut to fully engage. Always account for any washer thickness in your calculation.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan these carriage bolts be used in aluminum extrusion or PC case builds?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes, with the right approach. In aluminum extrusion frames, carriage bolts are typically used with T-slot nuts or drop-in nuts seated in the extrusion channel — the square neck may not self-lock in metal, so the bolt should be held manually or with a small clamp during nut tightening. For PC case panel fastening, the dome head provides a clean exterior finish. Confirm the thread pitch (M6 × 1.0 or M8 × 1.25) matches your T-nuts or threaded inserts before ordering.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eAre these bolts compatible with standard metric hex nuts and wing nuts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. These bolts use standard ISO metric coarse thread — M6 × 1.0 mm pitch and M8 × 1.25 mm pitch — which is compatible with any standard metric hex nut, flange nut, wing nut, or coupling nut of the matching size. No special tooling or proprietary hardware is required.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-cta\"\u003e\n🛒 Select your Thread Dia x Length and Pack of Quantity above, then add to cart.\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between M6 and M8 carriage bolts, and how do I choose?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"M6 refers to a 6 mm thread diameter and M8 to an 8 mm thread diameter. M6 bolts are suited for lighter structural connections while M8 bolts provide greater clamping force for heavier timber framing and load-bearing assemblies. Match the bolt diameter to the pre-drilled hole size in your hardware or hinge plate.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong are A2 304 stainless steel carriage bolts compared to zinc-plated steel?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A2 304 stainless steel has a minimum tensile strength of approximately 500 MPa (ISO 3506 property class 50), comparable to Grade 4.8 carbon steel. It offers significantly better corrosion resistance than zinc-plated steel without relying on a surface coating that can chip or wear.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will these bolts rust or corrode outdoors?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A2 304 stainless steel forms a passive chromium oxide layer that resists rust in most outdoor and freshwater environments. For direct saltwater or chloride-heavy environments, A4 316 stainless is recommended. In standard garden, decking, and outdoor furniture applications, A2 304 provides reliable long-term corrosion resistance.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do I need a washer with these carriage bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A washer under the nut is recommended when the bolt passes through timber, plywood, or composite board. It distributes clamping load over a wider area, preventing the nut from pulling through. The dome head side does not typically require a washer as the cup profile provides a broad bearing surface.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What length carriage bolt should I use for my application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Select a bolt length equal to the total thickness of all materials being clamped, plus at least 1.5× the bolt diameter for nut thread engagement. For example, two 18 mm boards (36 mm total) with an M8 bolt would call for at least a 50 mm bolt.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can these carriage bolts be used in aluminum extrusion or PC case builds?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. In aluminum extrusion frames, use with T-slot or drop-in nuts. The square neck may not self-lock in metal, so hold the bolt manually during tightening. Confirm thread pitch (M6 × 1.0 or M8 × 1.25) matches your T-nuts or threaded inserts before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these bolts compatible with standard metric hex nuts and wing nuts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. 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15PCS","offer_id":52308580761874,"sku":"GLFBQLPGB05960x15","price":30.8,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 50mm \/ 20PCS","offer_id":52308580794642,"sku":"GLFBQLPGB05960x20","price":40.66,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 55mm \/ 1PCS","offer_id":52308580827410,"sku":"GLFBQLPGB05961x1","price":3.54,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 55mm \/ 2PCS","offer_id":52308580860178,"sku":"GLFBQLPGB05961x2","price":5.43,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 55mm \/ 3PCS","offer_id":52308580892946,"sku":"GLFBQLPGB05961x3","price":7.56,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 55mm \/ 5PCS","offer_id":52308580925714,"sku":"GLFBQLPGB05961x5","price":11.83,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 55mm \/ 10PCS","offer_id":52308580958482,"sku":"GLFBQLPGB05961x10","price":22.49,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 55mm \/ 15PCS","offer_id":52308580991250,"sku":"GLFBQLPGB05961x15","price":33.17,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 55mm \/ 20PCS","offer_id":52308581024018,"sku":"GLFBQLPGB05961x20","price":43.83,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 60mm \/ 1PCS","offer_id":52308581056786,"sku":"GLFBQLPGB05962x1","price":3.67,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 60mm \/ 2PCS","offer_id":52308581089554,"sku":"GLFBQLPGB05962x2","price":5.9,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 60mm \/ 3PCS","offer_id":52308581122322,"sku":"GLFBQLPGB05962x3","price":8.17,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 60mm \/ 5PCS","offer_id":52308581155090,"sku":"GLFBQLPGB05962x5","price":12.78,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 60mm \/ 10PCS","offer_id":52308581187858,"sku":"GLFBQLPGB05962x10","price":24.4,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 60mm \/ 15PCS","offer_id":52308581220626,"sku":"GLFBQLPGB05962x15","price":36.01,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 60mm \/ 20PCS","offer_id":52308581253394,"sku":"GLFBQLPGB05962x20","price":47.53,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 70mm \/ 1PCS","offer_id":52308581286162,"sku":"GLFBQLPGB05963x1","price":3.92,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 70mm \/ 2PCS","offer_id":52308581318930,"sku":"GLFBQLPGB05963x2","price":6.51,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 70mm \/ 3PCS","offer_id":52308581351698,"sku":"GLFBQLPGB05963x3","price":9.13,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 70mm \/ 5PCS","offer_id":52308581384466,"sku":"GLFBQLPGB05963x5","price":14.44,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 70mm \/ 10PCS","offer_id":52308581417234,"sku":"GLFBQLPGB05963x10","price":27.62,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 70mm \/ 15PCS","offer_id":52308581450002,"sku":"GLFBQLPGB05963x15","price":40.76,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 70mm \/ 20PCS","offer_id":52308581482770,"sku":"GLFBQLPGB05963x20","price":53.94,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 80mm \/ 1PCS","offer_id":52308581515538,"sku":"GLFBQLPGB05964x1","price":4.15,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 80mm \/ 2PCS","offer_id":52308581548306,"sku":"GLFBQLPGB05964x2","price":7.09,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 80mm \/ 3PCS","offer_id":52308581581074,"sku":"GLFBQLPGB05964x3","price":9.93,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 80mm \/ 5PCS","offer_id":52308581613842,"sku":"GLFBQLPGB05964x5","price":15.76,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 80mm \/ 10PCS","offer_id":52308581646610,"sku":"GLFBQLPGB05964x10","price":30.33,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 80mm \/ 15PCS","offer_id":52308581679378,"sku":"GLFBQLPGB05964x15","price":44.78,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 80mm \/ 20PCS","offer_id":52308581712146,"sku":"GLFBQLPGB05964x20","price":59.39,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/1_6_38b66002-4358-4134-ae87-5a5d8248b0c8.jpg?v=1780476644"},{"product_id":"m8-m10-m12-carriage-bolts-304-stainless-steel","title":"M8 M10 M12 Carriage Bolts, 304 Stainless Steel Round Head Square Neck Screws","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"hdiy-desc\"\u003e\n\u003c!-- ① OVERVIEW --\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eM8 M10 M12 Carriage Bolts — Secure Structural Connections with 304 Stainless Steel\u003c\/h2\u003e\n\u003cp\u003eWhether you're building a backyard deck, assembling a pergola, or reinforcing a timber frame, a loose or rusted fastener can compromise the entire structure. These M8 M10 M12 carriage bolts are designed for builders, woodworkers, and serious DIYers who need a fastener that holds firm and resists corrosion over the long term — without constant maintenance.\u003c\/p\u003e\n\u003cp\u003eEach bolt is machined from 304 stainless steel and features a smooth round dome head with a square neck shank. The square neck embeds into wood or soft material to prevent rotation while you tighten the nut from the opposite side — no wrench needed on the bolt head. Available in three thread diameters: M8 (8mm \/ ≈5\/16\"), M10 (10mm \/ ≈3\/8\"), and M12 (12mm \/ ≈1\/2\"). Lengths range from 12mm (≈1\/2\") up to 100mm (≈3-15\/16\"), sold in flexible pack quantities from 1 to 50 pieces so you can order exactly what your project requires.\u003c\/p\u003e\n\u003cp\u003eTypical applications include deck and fence construction, pergola and gazebo assembly, timber framing, playground equipment, outdoor furniture, and marine dock hardware — anywhere a clean, tamper-resistant bolt head and reliable corrosion resistance are needed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- ② COMPATIBILITY BAR --\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Standard metric coarse thread (ISO 68-1) — M8 × 1.25mm pitch, M10 × 1.5mm pitch, M12 × 1.75mm pitch. Compatible with standard metric hex nuts, flange nuts, and flat washers. Square neck fits wood, plywood, and soft composite panels.\u003c\/div\u003e\n\u003c!-- ③ KEY FEATURES --\u003e\n\u003ch2\u003e✅ Key Features of These Stainless Steel Carriage Bolts\u003c\/h2\u003e\n\u003cul class=\"hdiy-features\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e304 Stainless Steel Construction\u003c\/strong\u003e — Provides solid corrosion resistance in outdoor, humid, and mildly corrosive environments, making these carriage bolts a reliable choice for exterior wood joinery and structural connections.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔘\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eSmooth Round Dome Head\u003c\/strong\u003e — The low-profile dome head sits flush against the surface for a clean, snag-free finish on decking, furniture, and playground equipment where exposed bolt heads are visible.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⬛\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eSquare Neck Anti-Rotation Design\u003c\/strong\u003e — The square shank under the head embeds into wood or soft material, locking the bolt in place so you can tighten the nut single-handedly without holding the bolt head — a key advantage for carriage bolt installation in tight spaces.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eWide Size Range — M8, M10, M12\u003c\/strong\u003e — Three thread diameters and lengths from 12mm (≈1\/2\") to 100mm (≈3-15\/16\") cover the most common structural fastening needs, from light furniture assembly to heavy timber framing.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e — Order as few as 1 piece for a repair job or up to 50 pieces for a full build. Bulk packs reduce per-unit cost for larger projects like deck construction or fence installation.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eStandard Metric Thread Compatibility\u003c\/strong\u003e — ISO 68-1 coarse thread ensures these bolts pair correctly with off-the-shelf metric nuts and washers, eliminating guesswork when sourcing matching hardware at any hardware store.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- ④ TECHNICAL SPECIFICATIONS --\u003e\n\u003ch2\u003e📐 Technical Specifications — Stainless Steel Carriage Bolts M8 M10 M12\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e304 Stainless Steel (A2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eRound dome (carriage bolt head)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNeck Style\u003c\/th\u003e\n\u003ctd\u003eSquare neck (anti-rotation)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eMetric coarse thread, ISO 68-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Diameter Options\u003c\/th\u003e\n\u003ctd\u003eM8 (8mm \/ ≈5\/16\"), M10 (10mm \/ ≈3\/8\"), M12 (12mm \/ ≈1\/2\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Pitch\u003c\/th\u003e\n\u003ctd\u003eM8: 1.25mm | M10: 1.5mm | M12: 1.75mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLength Range\u003c\/th\u003e\n\u003ctd\u003e12mm (≈1\/2\") – 100mm (≈3-15\/16\"); see variant options for full list\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantity Options\u003c\/th\u003e\n\u003ctd\u003e1, 2, 3, 5, 8, 10, 15, 20, 25, 50 pieces\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural stainless steel (brushed\/mill finish)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCorrosion Resistance\u003c\/th\u003e\n\u003ctd\u003eGood — suitable for outdoor and humid environments; not recommended for prolonged saltwater immersion\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDrive Method\u003c\/th\u003e\n\u003ctd\u003eNo drive required on head — tighten nut from opposite side\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Fasteners\u003c\/th\u003e\n\u003ctd\u003eStandard metric hex nuts, flange nuts, flat washers (M8 \/ M10 \/ M12)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTypical Applications\u003c\/th\u003e\n\u003ctd\u003eDecking, fencing, pergolas, timber framing, outdoor furniture, playground equipment\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-note\"\u003e\n\u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e \u003cstrong\u003eSize Tip:\u003c\/strong\u003e If you are unsure which diameter or length to order, measure the total material thickness being joined and add 10–15mm for the nut. Refer to the FAQ below for a step-by-step guide.\u003c\/div\u003e\n\u003c!-- ⑤ FAQ --\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right length for my carriage bolt?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure the total thickness of all materials being joined, then add typically 5–10mm for the nut and washer. For example, joining two 20mm boards generally calls for a bolt around 45–50mm (≈1-3\/4\" to 2\") long. Always confirm the grip length before ordering. If you are between sizes, choose the longer option to ensure full thread engagement.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the tensile strength of these carriage bolts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e304 stainless steel carriage bolts generally have a tensile strength of approximately 500–700 MPa, depending on diameter and manufacturing tolerances. For heavy structural loads or safety-critical applications, consult a structural engineer to confirm suitability for your specific use case.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these bolts suitable for outdoor or marine use?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e304 stainless steel offers good corrosion resistance for most outdoor environments including decks, fences, and pergolas. For coastal or marine applications with constant saltwater exposure, 316 stainless steel is typically recommended for superior chloride resistance. In most inland outdoor settings, 304 SS performs well over many years.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat thread standard do these carriage bolts use, and which nuts are compatible?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese bolts use standard metric coarse thread (ISO 68-1). M8 bolts are typically 1.25mm pitch, M10 bolts 1.5mm pitch, and M12 bolts 1.75mm pitch. They are compatible with standard metric hex nuts, flange nuts, and flat washers in the corresponding size — all readily available at hardware stores.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo I need a special tool to install carriage bolts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eNo special tools are required on the bolt head side. The square neck under the dome head locks into a pre-drilled square hole — or embeds into wood — preventing rotation while you tighten the nut from the opposite side with a standard wrench or socket. For wood applications, you can typically drive the bolt through a round hole and the square neck will self-embed as you tighten.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhich diameter should I choose — M8, M10, or M12?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eM8 (≈5\/16\" diameter) is generally suitable for light-to-medium structural connections such as furniture, light fencing, and shelving. M10 (≈3\/8\") is commonly used for decking, pergolas, and medium-load framing. M12 (≈1\/2\") is typically chosen for heavy structural applications like timber framing, retaining wall anchors, and playground equipment. When in doubt, size up for added safety margin.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these bolts with aluminum or composite materials?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eIn most cases, yes. However, the square neck anti-rotation feature works best in wood or soft materials where it can embed. For aluminum or hard composites, you may need to use a square hole punch or a backing plate to prevent the neck from spinning during installation. Contact us if you have a specific application question.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003c!-- ⑥ CTA BAR --\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your size and pack quantity above, then add to cart — ships from our US warehouse.\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M8 \/ 12mm \/ 2PCS","offer_id":52308582203666,"sku":"GLFBQLPBRTQJD018784x2","price":3.2,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 12mm \/ 5PCS","offer_id":52308582236434,"sku":"GLFBQLPBRTQJD018784x5","price":4.69,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 12mm \/ 10PCS","offer_id":52308582269202,"sku":"GLFBQLPBRTQJD018784x10","price":8.09,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 12mm \/ 15PCS","offer_id":52308582301970,"sku":"GLFBQLPBRTQJD018784x15","price":11.49,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 12mm \/ 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DIYers and contractors working with outdoor wood need a bolt that locks in place without spinning, resists the elements season after season, and meets a recognized dimensional standard — not a generic hardware bin grab-bag.\u003c\/p\u003e\n\u003cp\u003eEach box in this listing contains M8 cup square dome head carriage bolts manufactured to \u003cstrong\u003eDIN 603\u003c\/strong\u003e in \u003cstrong\u003eA2 (304) stainless steel\u003c\/strong\u003e. The 8mm shank features a square neck that embeds into timber to prevent rotation while you tighten the nut from the other side. Available lengths run from \u003cstrong\u003e30mm (≈1-3\/16\")\u003c\/strong\u003e to \u003cstrong\u003e70mm (≈2-3\/4\")\u003c\/strong\u003e, with pack quantities of 15–30 pieces per box depending on the length selected. All bolts carry a standard M8 metric coarse thread (1.25mm pitch) compatible with any M8 hex or wing nut.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include \u003cstrong\u003edeck board-to-joist connections\u003c\/strong\u003e, \u003cstrong\u003efence rail and post assembly\u003c\/strong\u003e, \u003cstrong\u003etimber frame and pergola construction\u003c\/strong\u003e, and \u003cstrong\u003ewood-to-metal bracket fastening\u003c\/strong\u003e in garden structures. The smooth dome head sits flush and clean on the surface, making these coach screws a practical choice wherever a finished appearance matters alongside structural integrity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eThread Compatibility:\u003c\/strong\u003e Standard M8 metric coarse thread (pitch 1.25mm) — fits all DIN 934 M8 hex nuts, M8 wing nuts, and M8 flat washers. \u003cstrong\u003eNot compatible with imperial (SAE\/UNC) threaded hardware.\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These M8 Stainless Steel Carriage Bolts\u003c\/h2\u003e\n\u003cul class=\"hdiy-features\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔒\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eAnti-Rotation Square Neck\u003c\/strong\u003e — The square shoulder under the dome head bites into timber on installation, holding the bolt stationary so you can tighten the nut single-handed without a second wrench on the bolt side.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🌧️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eA2 Stainless Steel Construction\u003c\/strong\u003e — Grade 304 stainless provides reliable corrosion resistance for outdoor decking, fencing, and garden structures exposed to rain, humidity, and temperature cycling.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eDIN 603 Dimensional Standard\u003c\/strong\u003e — Manufactured to the DIN 603 specification for cup square dome head coach bolts, ensuring consistent head geometry, thread pitch, and square neck dimensions across every piece in the box.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eProject-Ready Pack Quantities\u003c\/strong\u003e — Sold in counted boxes (15–30 pcs depending on length) so you can order exactly what a job requires without sorting through bulk bags or paying for excess hardware.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFive Length Options in One Listing\u003c\/strong\u003e — Choose from 30mm, 40mm, 50mm, 60mm, or 70mm to match your timber thickness — no need to source different products for different joints on the same build.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e✨\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eSmooth Dome Head Finish\u003c\/strong\u003e — The rounded cup head leaves a clean, low-profile surface on the visible face of the joint — suitable for finished woodwork, furniture frames, and anywhere aesthetics matter alongside strength.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e📐 Technical Specifications — M8 DIN 603 Carriage Bolts\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Size\u003c\/th\u003e\n\u003ctd\u003eM8 (8mm diameter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eMetric coarse, pitch 1.25mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHead Type\u003c\/th\u003e\n\u003ctd\u003eCup square dome head (carriage \/ coach bolt)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDimensional Standard\u003c\/th\u003e\n\u003ctd\u003eDIN 603\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eA2 Stainless Steel (Grade 304)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eMill \/ natural stainless (no coating)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e30mm (≈1-3\/16\"), 40mm (≈1-9\/16\"), 50mm (≈2\"), 60mm (≈2-3\/8\"), 70mm (≈2-3\/4\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHead Diameter (typical)\u003c\/th\u003e\n\u003ctd\u003eTypically 21–22mm — see variant options to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSquare Neck Width (typical)\u003c\/th\u003e\n\u003ctd\u003eTypically 8mm — contact us to confirm if critical\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e30mm: 30 pcs\/box | 40mm: 25 pcs\/box | 50mm: 20 pcs\/box | 60mm: 20 pcs\/box | 70mm: 15 pcs\/box\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNuts \/ Washers Included\u003c\/th\u003e\n\u003ctd\u003eBolts only — nuts and washers sold separately\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRecommended Use\u003c\/th\u003e\n\u003ctd\u003eTimber framing, decking, fencing, pergolas, wood-to-metal connections\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNot Suitable For\u003c\/th\u003e\n\u003ctd\u003eConcrete anchoring, masonry, or marine\/saltwater immersion (use A4\/316 for those)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right bolt length for my project?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAdd up the total thickness of all materials being joined, then add approximately 10–15mm to allow for a flat washer and nut on the back. For example, joining two 20mm (3\/4\") boards typically calls for a 50mm (≈2\") bolt. The five lengths in this listing — 30mm, 40mm, 50mm, 60mm, and 70mm — cover timber thicknesses from roughly 15mm up to 55mm combined.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does A2 stainless steel mean, and how strong are these bolts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA2 stainless (also called 304 stainless) is an austenitic grade with a tensile strength of typically 500–700 MPa and good resistance to rust and oxidation. It handles outdoor exposure in most climates well. For highly aggressive environments — prolonged saltwater spray, coastal installations, or chemical exposure — A4 (316) stainless is generally the better choice.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these carriage bolts outdoors or in wet conditions?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. A2 stainless steel provides solid corrosion resistance for outdoor decking, fencing, pergolas, and garden structures exposed to rain and humidity. For prolonged saltwater or coastal environments, A4 (316) stainless fasteners are generally recommended to maximize service life.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these compatible with standard M8 nuts and washers I already have?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes — these bolts use a standard M8 metric coarse thread (1.25mm pitch) and are compatible with any DIN 934 M8 hex nut, M8 wing nut, or M8 flat washer. They are \u003cstrong\u003enot\u003c\/strong\u003e compatible with imperial (SAE\/UNC) threaded hardware. To maintain consistent corrosion resistance, we recommend pairing with A2 stainless M8 nuts and washers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat are the dome head and square neck dimensions on an M8 DIN 603 bolt?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eFor M8 DIN 603 carriage bolts, the dome head diameter is typically around 21–22mm and the square neck width is typically 8mm. The square neck is designed to embed into timber and prevent the bolt from spinning during tightening. If you have critical tolerance requirements, please contact us to confirm exact dimensions before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo nuts and washers come included in the box?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eNo — this listing includes carriage bolts only. Matching M8 hex nuts and flat washers are sold separately. We recommend sourcing A2 stainless M8 nuts and washers to keep the entire fastener assembly at the same corrosion-resistance level.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat applications are M8 DIN 603 carriage bolts not suitable for?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese bolts are designed for wood-to-wood and wood-to-metal connections. They are generally not suitable for concrete anchoring, masonry, or applications requiring through-hardened structural bolts. For those uses, consult a structural engineer and select the appropriate fastener grade and type.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your \u003cstrong\u003elength\u003c\/strong\u003e above, then add to cart — ships from our US warehouse.\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M8 \/ 30mm \/ 30PCS","offer_id":52308590461202,"sku":"KAYFST029-8","price":12.58,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 40mm \/ 25PCS","offer_id":52308590493970,"sku":"KAYFST029-9","price":12.69,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 50mm \/ 20PCS","offer_id":52308590526738,"sku":"KAYFST029-10","price":11.76,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 60mm \/ 20PCS","offer_id":52308590559506,"sku":"KAYFST029-11","price":13.33,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 70mm \/ 15PCS","offer_id":52308590592274,"sku":"KAYFST029-12","price":12.72,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture1of5_66515466-75c1-4126-b6af-e148a60d1326.jpg?v=1780501869"},{"product_id":"m10-carriage-bolts-a2-stainless-steel-din-603-cup-square-dome-head","title":"M10 Carriage Bolts A2 Stainless Steel — Cup Square Dome Head Coach Screws DIN 603","description":"\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose the right length for M10 carriage bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A general rule is to add the thickness of all materials being joined, then add at least 1–1.5× the bolt diameter (10mm) for the nut and washer. For example, joining two 25mm (1\\\") boards typically calls for a 60mm (≈2-3\/8\\\") bolt. Always confirm the grip length before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What grade is the stainless steel used in these carriage bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These bolts are manufactured from A2 stainless steel (equivalent to 304 stainless), which offers good corrosion resistance for most outdoor and marine-adjacent environments. For highly aggressive saltwater or chemical exposure, A4 (316) grade is generally recommended instead.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can these carriage bolts be used outdoors or in wet conditions?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. A2 stainless steel provides solid resistance to rust and oxidation, making these bolts suitable for outdoor decking, fencing, pergolas, and garden structures. They are not recommended for continuous saltwater immersion — for that, A4 stainless is typically the better choice.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What thread standard do these bolts follow?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These carriage bolts conform to DIN 603 and use the standard M10 metric coarse thread (pitch 1.5mm). They are compatible with standard M10 hex nuts, nylon lock nuts, and flat washers.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How does the cup square (carriage bolt) head prevent the bolt from spinning?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The square section of the shank, located directly beneath the dome head, is designed to bite into the wood fiber as the nut is tightened. This self-locking action holds the bolt stationary so you can apply torque from the nut side only — no need to hold the head with a second tool.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do I need a washer, and should it go under the head or the nut?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"In most cases, a flat washer is placed under the nut (not under the dome head). The dome head is designed to seat directly against the workpiece surface. The washer on the nut side distributes the clamping force over a larger area, reducing the risk of the nut pulling through softer wood.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the tensile strength of A2 stainless steel carriage bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A2 stainless steel fasteners typically have a tensile strength of around 500–700 MPa depending on the property class (commonly A2-50 or A2-70). For structural or load-bearing applications, confirm the required load rating with an engineer before specifying.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eM10 Carriage Bolts in A2 Stainless Steel — Secure, Rust-Resistant Fastening for Wood and Structural Projects\u003c\/h2\u003e\n    \u003cp\u003eWhether you're building a backyard deck, assembling a pergola, hanging a gate, or tackling a timber-frame repair, loose or corroded fasteners are the last thing you want to deal with mid-project. These M10 A2 stainless steel carriage bolts are engineered for DIYers and tradespeople who need a reliable, corrosion-resistant connection that holds firm season after season — without the rust streaks left by zinc-plated alternatives.\u003c\/p\u003e\n    \u003cp\u003eEach set includes M10 cup square dome head coach screws conforming to DIN 603, manufactured from A2 (304) stainless steel. The M10 shank diameter (≈3\/8\") is paired with a square neck that self-locks into wood as you tighten. Available lengths range from 40mm (≈1-9\/16\") to 100mm (≈3-15\/16\"), sold in box quantities of 8 to 15 pieces depending on the size selected. Matching M10 hex nuts and flat washers are sold separately.\u003c\/p\u003e\n    \u003cp\u003eTypical applications include outdoor deck construction with M10 stainless carriage bolts through 2× lumber, timber pergola and arbor assembly, wooden gate hinge reinforcement, and general structural wood-to-wood fastening where a smooth, tamper-resistant dome head is required on the visible face.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e\n    \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Standard M10 metric coarse thread (pitch 1.5mm) — fits M10 hex nuts, nylon lock nuts, and flat washers. Conforms to \u003cstrong\u003eDIN 603\u003c\/strong\u003e. Designed primarily for through-bolting timber, plywood, and structural wood assemblies.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e✅ Key Features of These M10 Stainless Steel Carriage Bolts\u003c\/h2\u003e\n  \u003cul class=\"hdiy-features\"\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🦀\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eA2 Stainless Steel Construction\u003c\/strong\u003e — Manufactured from A2 (304) stainless steel for reliable corrosion resistance in outdoor, humid, and weather-exposed environments — a significant step up from standard zinc-plated coach screws.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🔵\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eDIN 603 Cup Square Dome Head\u003c\/strong\u003e — The smooth, rounded dome head sits flush against the workpiece for a clean, snag-free finish on the visible face, while the square neck self-locks into wood to prevent rotation during tightening.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eMultiple Length Options\u003c\/strong\u003e — Choose from 40mm (≈1-9\/16\"), 50mm (≈2\"), 60mm (≈2-3\/8\"), 70mm (≈2-3\/4\"), 90mm (≈3-9\/16\"), or 100mm (≈3-15\/16\") to match your specific timber thickness and grip-length requirements.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eBoxed in Project-Ready Quantities\u003c\/strong\u003e — Sold in pre-counted box sets (8–15 pcs depending on length) so you can plan material quantities accurately and avoid over-ordering on smaller jobs.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eSingle-Side Installation\u003c\/strong\u003e — The self-locking square shank eliminates the need to hold the bolt head during tightening — ideal for through-bolting applications where access to both sides is limited.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🏗️\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eVersatile Structural Use\u003c\/strong\u003e — Suited for deck framing, fence post connections, pergola beam joints, gate hardware mounting, and other outdoor wood-to-wood structural fastening where a tamper-resistant head profile is preferred.\u003c\/span\u003e\n    \u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003e📐 Technical Specifications — M10 DIN 603 Carriage Bolts\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eStandard\u003c\/th\u003e\n\u003ctd\u003eDIN 603\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Type\u003c\/th\u003e\n\u003ctd\u003eCup Square (Dome \/ Mushroom) Head\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eDrive Type\u003c\/th\u003e\n\u003ctd\u003eNo drive — square neck self-locking (wrench on nut only)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Diameter\u003c\/th\u003e\n\u003ctd\u003eM10 (≈3\/8\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Pitch\u003c\/th\u003e\n\u003ctd\u003e1.5mm (metric coarse)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e40mm (≈1-9\/16\"), 50mm (≈2\"), 60mm (≈2-3\/8\"), 70mm (≈2-3\/4\"), 90mm (≈3-9\/16\"), 100mm (≈3-15\/16\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eA2 Stainless Steel (304 equivalent)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural stainless (no coating)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTensile Strength\u003c\/th\u003e\n\u003ctd\u003eTypically 500–700 MPa (A2-50 \/ A2-70 class)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eQuantity per Box\u003c\/th\u003e\n\u003ctd\u003eSee variant options (8–15 pcs depending on length)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCompatible Nut\u003c\/th\u003e\n\u003ctd\u003eStandard M10 hex nut, nylon lock nut (sold separately)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eRecommended Washer\u003c\/th\u003e\n\u003ctd\u003eM10 flat washer under nut (sold separately)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePrimary Application\u003c\/th\u003e\n\u003ctd\u003eTimber \/ structural wood through-bolting\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-faq\"\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right length for M10 carriage bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA general rule is to add the total thickness of all materials being joined, then add at least 1–1.5× the bolt diameter (10mm) to account for the nut and washer stack. For example, joining two 25mm (1\") boards typically calls for a 60mm (≈2-3\/8\") bolt. Always measure your actual grip length before selecting a size. If you're between sizes, go longer — you can always add a washer to take up slack.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat grade is the stainless steel, and how does it compare to zinc-plated bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese bolts are made from A2 stainless steel (equivalent to 304 stainless). Compared to standard zinc-plated or hot-dip galvanized carriage bolts, A2 stainless offers superior long-term corrosion resistance without the white rust or coating degradation common with zinc finishes — particularly in humid, coastal, or outdoor environments. For highly aggressive saltwater or chemical exposure, A4 (316) stainless is generally the better choice.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan these carriage bolts be used outdoors or in wet conditions?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eYes. A2 stainless steel provides solid resistance to rust and oxidation, making these bolts well-suited for outdoor decking, fencing, pergolas, garden structures, and similar applications. They are not recommended for continuous saltwater immersion or highly corrosive chemical environments — for those conditions, A4 (316) stainless is typically the better specification.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat thread standard do these bolts follow, and what nuts are compatible?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese carriage bolts conform to DIN 603 and use the standard M10 metric coarse thread (pitch 1.5mm). They are compatible with any standard M10 hex nut, nylon insert lock nut (Nyloc), or flange nut. A flat M10 washer under the nut is recommended to distribute clamping load and protect the wood surface.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow does the cup square head prevent the bolt from spinning?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThe square section of the shank, located directly beneath the dome head, is designed to bite into the wood fiber as the nut is tightened. This self-locking action holds the bolt stationary so you can apply torque from the nut side only — no need to hold the head with a second tool. This makes them especially practical when the bolt head is recessed or on the underside of a structure.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDo I need a washer, and should it go under the head or the nut?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eIn most cases, a flat washer is placed under the nut (not under the dome head). The dome head is designed to seat directly against the workpiece surface. The washer on the nut side distributes the clamping force over a larger area, reducing the risk of the nut pulling through softer wood. For hardwoods or steel-to-wood connections, a washer may not be strictly necessary but is still good practice.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the load-bearing or tensile strength of these bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA2 stainless steel fasteners typically carry a tensile strength of around 500–700 MPa, depending on the property class (A2-50 or A2-70). For structural or load-bearing applications — such as deck ledger connections or load-path timber joints — always confirm the required load rating with a licensed engineer and consult local building codes before specifying fastener size and quantity.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your \u003cstrong\u003elength and quantity\u003c\/strong\u003e above, then add to cart — ships from our US warehouse.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M10 \/ 40mm \/ 15PCS","offer_id":52308590625042,"sku":"KAYFST029-13","price":13.15,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 50mm \/ 10PCS","offer_id":52308590657810,"sku":"KAYFST029-14","price":11.52,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 60mm \/ 10PCS","offer_id":52308590690578,"sku":"KAYFST029-15","price":12.17,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 70mm \/ 10PCS","offer_id":52308590723346,"sku":"KAYFST029-16","price":13.26,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 90mm \/ 10PCS","offer_id":52308590756114,"sku":"KAYFST029-17","price":15.44,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 100mm \/ 8PCS","offer_id":52308590788882,"sku":"KAYFST029-18","price":14.44,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/1_5_a8d5755f-b186-4fdc-9638-ca6eb1c74279.jpg?v=1780501869"},{"product_id":"m3-m4-m5-stainless-steel-carriage-bolts-din-603-304","title":"M3 M4 M5 Stainless Steel Carriage Bolts — DIN 603 Cup Square Dome Head, 304 SS","description":"\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose the right length for my carriage bolt?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Generally, the bolt length should equal the total thickness of the materials being joined plus enough thread engagement for the nut — typically at least 1× the thread diameter beyond the material. For example, joining two 10mm boards with M5 bolts would typically require at least 25mm (≈1\\\") length. Always add a washer and nut to your calculation.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the load-bearing capacity of these carriage bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"304 stainless steel carriage bolts typically have a tensile strength of around 500–700 MPa. Actual load capacity depends on thread diameter, length, and the materials being fastened. For structural or load-critical applications, consult an engineer and verify the specific grade requirements.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these carriage bolts suitable for outdoor or marine use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"304 stainless steel offers good corrosion resistance and is generally suitable for outdoor use in most environments. For highly corrosive or marine environments with constant saltwater exposure, 316 stainless steel is generally recommended. These bolts are well-suited for decks, fences, pergolas, and general outdoor woodworking.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What thread standard do these carriage bolts use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These bolts conform to DIN 603 and use standard metric coarse threads (M3, M4, or M5). They are compatible with standard metric hex nuts and washers of the corresponding size.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What tool do I need to tighten these bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Carriage bolts are designed to be tightened from the nut side only. The square neck under the dome head bites into wood or soft material to prevent the bolt from spinning. You only need a wrench or socket on the nut — no screwdriver or hex key is needed on the bolt head.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I select the right thread diameter — M3, M4, or M5?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Thread diameter selection depends on the load and material thickness. M3 (≈0.12\\\" diameter) is typically used for light-duty or thin-material applications. M4 (≈0.16\\\") suits medium-duty joints. M5 (≈0.20\\\") is appropriate for heavier loads or thicker stock. When in doubt, size up for added safety margin.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these bolts in metal-to-metal applications?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Carriage bolts are primarily designed for wood-to-wood or wood-to-metal connections, where the square neck locks into the material. In metal-to-metal applications, the square neck cannot grip, so the bolt may spin during tightening. For metal-to-metal use, a hex bolt or socket head cap screw is generally more appropriate.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eM3–M5 Stainless Steel Carriage Bolts — Secure, Corrosion-Resistant Fastening for Wood \u0026amp; Outdoor Projects\u003c\/h2\u003e\n    \u003cp\u003eWhen a standard bolt spins loose or a hex head mars the surface of your woodwork, you need a fastener designed specifically for the job. DIYers, woodworkers, and contractors who build decks, pergolas, furniture, and outdoor structures rely on carriage bolts for their self-locking square neck and clean dome profile — no exposed drive recess to collect water or rust.\u003c\/p\u003e\n    \u003cp\u003eEach set contains carriage bolts conforming to \u003cstrong\u003eDIN 603\u003c\/strong\u003e, manufactured from \u003cstrong\u003e304 stainless steel\u003c\/strong\u003e for reliable corrosion resistance. Thread diameters available are \u003cstrong\u003eM3 (≈0.12\")\u003c\/strong\u003e, \u003cstrong\u003eM4 (≈0.16\")\u003c\/strong\u003e, and \u003cstrong\u003eM5 (≈0.20\")\u003c\/strong\u003e. Lengths range from \u003cstrong\u003e8mm (≈5\/16\")\u003c\/strong\u003e to \u003cstrong\u003e50mm (≈2\")\u003c\/strong\u003e. Pack quantities of 5, 10, 20, 50, and 100 pieces let you order exactly what your project requires — no waste, no shortage.\u003c\/p\u003e\n    \u003cp\u003eThese stainless steel carriage bolts are well-suited for \u003cstrong\u003eoutdoor deck construction\u003c\/strong\u003e where weather resistance matters, \u003cstrong\u003efurniture assembly and woodworking joints\u003c\/strong\u003e that need a flush, tamper-resistant finish, and \u003cstrong\u003eDIY pergola and fence builds\u003c\/strong\u003e where the dome head provides a clean aesthetic on the visible face of the board.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e\n    \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Fits standard metric hex nuts and flat washers (M3 \/ M4 \/ M5). Conforms to DIN 603. Square neck is designed for wood and soft-material applications — select your thread diameter and length above before adding to cart.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e✅ Key Features of These Stainless Steel Carriage Bolts\u003c\/h2\u003e\n  \u003cul class=\"hdiy-features\"\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔒\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eSelf-Locking Square Neck\u003c\/strong\u003e — The square shoulder under the dome head bites into wood to prevent rotation during tightening, so you can drive the nut without holding the bolt head.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🌧️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e304 Stainless Steel Construction\u003c\/strong\u003e — Resists rust and oxidation in outdoor and humid environments, making these bolts a dependable choice for deck boards, garden structures, and exterior furniture.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eDIN 603 Standard Compliance\u003c\/strong\u003e — Manufactured to DIN 603 dimensional tolerances, ensuring consistent fit with standard metric nuts, washers, and pre-drilled holes across M3, M4, and M5 sizes.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eDome Head Profile\u003c\/strong\u003e — The smooth, rounded head sits flush and tamper-resistant on the visible face of your workpiece — ideal for furniture joints and outdoor woodworking where appearance matters.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e — Available in 5, 10, 20, 50, and 100-piece packs so you can match your order to your project scope without overstocking or running short mid-build.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eWide Length Range\u003c\/strong\u003e — Lengths from 8mm (≈5\/16\") to 50mm (≈2\") cover thin panel connections through thick timber joints, with multiple intermediate sizes for precise fit.\u003c\/span\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003e📐 Technical Specifications — DIN 603 Carriage Bolts\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eStandard\u003c\/th\u003e\n\u003ctd\u003eDIN 603\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eCup Square \/ Dome Head (Mushroom Head)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eDrive Style\u003c\/th\u003e\n\u003ctd\u003eNone — square neck, nut-side tightening only\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e304 Stainless Steel (A2)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Type\u003c\/th\u003e\n\u003ctd\u003eMetric Coarse (ISO 68-1)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Diameter\u003c\/th\u003e\n\u003ctd\u003eM3 \/ M4 \/ M5 (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eLength Range\u003c\/th\u003e\n\u003ctd\u003e8mm (≈5\/16\") – 50mm (≈2\") (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e5 \/ 10 \/ 20 \/ 50 \/ 100 PCS (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural stainless (brushed\/mill finish)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCorrosion Resistance\u003c\/th\u003e\n\u003ctd\u003eGood — suitable for outdoor and humid environments\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCompatible Nut\u003c\/th\u003e\n\u003ctd\u003eStandard metric hex nut (M3 \/ M4 \/ M5)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCompatible Washer\u003c\/th\u003e\n\u003ctd\u003eStandard metric flat washer (M3 \/ M4 \/ M5)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-note\"\u003e\n    \u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e\n    \u003cstrong\u003eNote:\u003c\/strong\u003e Carriage bolts require a pre-drilled hole matching the bolt diameter. The square neck is designed to grip wood and soft materials — it will not self-lock in metal-to-metal applications. Always pair with an appropriate nut and washer.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-faq\"\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right length for my carriage bolt?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eGenerally, the bolt length should equal the total thickness of the materials being joined plus enough thread engagement for the nut — typically at least 1× the thread diameter beyond the material. For example, joining two 10mm boards with M5 bolts would typically require at least 25mm (≈1\") length. Always factor in a washer and nut when calculating the required thread protrusion.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the load-bearing capacity of these carriage bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003e304 stainless steel carriage bolts typically have a tensile strength of around 500–700 MPa. Actual load capacity depends on thread diameter, length, and the materials being fastened. For structural or load-critical applications, consult an engineer and verify the specific grade requirements for your project.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these carriage bolts suitable for outdoor or marine use?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003e304 stainless steel offers good corrosion resistance and is generally suitable for outdoor use in most environments, including decks, fences, and pergolas. For highly corrosive or marine environments with constant saltwater exposure, 316 stainless steel is generally recommended. These bolts perform well in typical outdoor DIY and construction applications.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat thread standard do these carriage bolts use, and what nuts are compatible?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese bolts conform to \u003cstrong\u003eDIN 603\u003c\/strong\u003e and use standard metric coarse threads (M3, M4, or M5). They are compatible with standard metric hex nuts and flat washers of the corresponding size, which are widely available at hardware stores across the US.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat tool do I need to install these bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eCarriage bolts are designed to be tightened from the nut side only. The square neck under the dome head bites into wood or soft material to prevent the bolt from spinning. You only need a wrench or socket on the nut — no screwdriver or hex key is required on the bolt head. This makes them especially convenient for one-person installation.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I select the right thread diameter — M3, M4, or M5?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThread diameter selection depends on the load and material thickness. \u003cstrong\u003eM3\u003c\/strong\u003e (≈0.12\" diameter) is typically used for light-duty or thin-material applications. \u003cstrong\u003eM4\u003c\/strong\u003e (≈0.16\") suits medium-duty joints and general woodworking. \u003cstrong\u003eM5\u003c\/strong\u003e (≈0.20\") is appropriate for heavier loads or thicker timber stock. When in doubt, size up for an added safety margin.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use these bolts in metal-to-metal applications?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eCarriage bolts are primarily designed for wood-to-wood or wood-to-metal connections, where the square neck locks into the material to prevent spinning. In metal-to-metal applications, the square neck cannot grip, so the bolt may rotate during tightening. For metal-to-metal use, a hex bolt or socket head cap screw is generally more appropriate.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your \u003cstrong\u003ethread diameter, length, and pack quantity\u003c\/strong\u003e above, then add to cart — ships from our US warehouse.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M3 \/ 8mm \/ 5PCS","offer_id":52308590821650,"sku":"AdaahSZBRT17573x5","price":2.3,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 8mm \/ 10PCS","offer_id":52308590854418,"sku":"AdaahSZBRT17573x10","price":2.43,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 8mm \/ 20PCS","offer_id":52308590887186,"sku":"AdaahSZBRT17573x20","price":2.72,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 8mm \/ 50PCS","offer_id":52308590919954,"sku":"AdaahSZBRT17573x50","price":3.82,"currency_code":"USD","in_stock":true},{"title":"M3 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5PCS","offer_id":52308595081490,"sku":"AdaahSZBRT17599x5","price":2.67,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 22mm \/ 10PCS","offer_id":52308595114258,"sku":"AdaahSZBRT17599x10","price":3.67,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 22mm \/ 20PCS","offer_id":52308595147026,"sku":"AdaahSZBRT17599x20","price":6.12,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 22mm \/ 50PCS","offer_id":52308595179794,"sku":"AdaahSZBRT17599x50","price":13.37,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 22mm \/ 100PCS","offer_id":52308595212562,"sku":"AdaahSZBRT17599x100","price":24.02,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 25mm \/ 5PCS","offer_id":52308595245330,"sku":"AdaahSZBRT17600x5","price":2.67,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 25mm \/ 10PCS","offer_id":52308595278098,"sku":"AdaahSZBRT17600x10","price":3.88,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 25mm \/ 20PCS","offer_id":52308595310866,"sku":"AdaahSZBRT17600x20","price":6.5,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 25mm \/ 50PCS","offer_id":52308595343634,"sku":"AdaahSZBRT17600x50","price":14.08,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 25mm \/ 100PCS","offer_id":52308595376402,"sku":"AdaahSZBRT17600x100","price":25.62,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 30mm \/ 5PCS","offer_id":52308595409170,"sku":"AdaahSZBRT17601x5","price":2.72,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 30mm \/ 10PCS","offer_id":52308595441938,"sku":"AdaahSZBRT17601x10","price":4.26,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 30mm \/ 20PCS","offer_id":52308595474706,"sku":"AdaahSZBRT17601x20","price":7.13,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 30mm \/ 50PCS","offer_id":52308595507474,"sku":"AdaahSZBRT17601x50","price":14.84,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 30mm \/ 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50PCS","offer_id":52308595998994,"sku":"AdaahSZBRT17604x50","price":20.1,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 45mm \/ 100PCS","offer_id":52308596031762,"sku":"AdaahSZBRT17604x100","price":38.07,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 50mm \/ 5PCS","offer_id":52308596064530,"sku":"AdaahSZBRT17605x5","price":3.54,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 50mm \/ 10PCS","offer_id":52308596097298,"sku":"AdaahSZBRT17605x10","price":5.78,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 50mm \/ 20PCS","offer_id":52308596130066,"sku":"AdaahSZBRT17605x20","price":10.25,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 50mm \/ 50PCS","offer_id":52308596162834,"sku":"AdaahSZBRT17605x50","price":22.48,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 50mm \/ 100PCS","offer_id":52308596195602,"sku":"AdaahSZBRT17605x100","price":42.77,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/2_10_fabdcf90-17b8-40c7-b5c9-92dc5970bc59.jpg?v=1780477944"},{"product_id":"black-carriage-bolts-m3-m4-m5-m6-cup-square-domed-a2-stainless-steel","title":"Black Carriage Bolts M3 M4 M5 M6 — Cup Square Domed Head, A2-70 Stainless Steel","description":"\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose the right bolt length for my project?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"As a general rule, the bolt length should equal the combined thickness of all materials being joined, plus enough thread engagement for the nut — typically at least 1× the bolt diameter. For example, joining two 10mm boards with an M5 bolt would generally require at least 25mm (≈1\\\"): 20mm of material plus ~5mm for the nut. Always measure your stack-up before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What grade is the stainless steel used in these carriage bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These bolts are made from A2-70 stainless steel (equivalent to 304 stainless), which provides a minimum tensile strength of 700 MPa. This grade is suitable for most structural and general-purpose fastening applications.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these bolts suitable for outdoor or marine use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A2 stainless steel offers good corrosion resistance and is generally suitable for outdoor use in most environments. However, for highly aggressive marine or coastal environments with prolonged saltwater exposure, A4 (316) stainless is typically recommended. The black finish on these bolts is a surface treatment and may show wear over time in harsh conditions.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What thread standard do these carriage bolts use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These bolts use standard ISO metric coarse threads (M3, M4, M5, M6). They are compatible with standard metric hex nuts, wing nuts, and washers of the corresponding size. They are not compatible with UNC\/UNF (imperial) threaded hardware.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is a cup square (carriage bolt) head and why does it matter?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A cup square head — also called a carriage bolt head — features a smooth domed top with a square shank section just below the head. When driven into wood or a square hole, the square section bites in and prevents the bolt from spinning while you tighten the nut from the other side. This makes installation faster and cleaner, with no need for a wrench on the bolt head.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these bolts in wood, metal, or plastic applications?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. These carriage bolts are commonly used in wood-to-wood, wood-to-metal, and metal-to-metal assemblies. The square neck is most effective in wood or soft materials where it can embed and resist rotation. For metal applications, a square hole or a separate anti-rotation method is generally needed.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I convert bolt lengths between mm and inches?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A quick reference: 8mm ≈ 5\/16\\\", 10mm ≈ 3\/8\\\", 12mm ≈ 15\/32\\\", 16mm ≈ 5\/8\\\", 20mm ≈ 25\/32\\\", 25mm ≈ 1\\\", 30mm ≈ 1-3\/16\\\", 40mm ≈ 1-9\/16\\\", 50mm ≈ 2\\\", 60mm ≈ 2-3\/8\\\", 80mm ≈ 3-1\/8\\\".\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eBlack Carriage Bolts M3–M6 — Secure, Clean-Looking Fasteners for Wood and Metal Projects\u003c\/h2\u003e\n    \u003cp\u003eWhether you're building a deck, assembling outdoor furniture, or fabricating a metal frame, finding a fastener that holds tight without spinning — and looks clean from the front — is a constant challenge. These black carriage bolts are designed for exactly that: the smooth domed head sits flush and finished on the visible side, while the square neck locks into the material so you can tighten the nut one-handed.\u003c\/p\u003e\n    \u003cp\u003eEach bolt is machined from A2-70 stainless steel (304 grade) with a black surface finish. Available in thread diameters M3, M4, M5, and M6, with lengths ranging from 8mm (≈5\/16\") to 80mm (≈3-1\/8\"). Order in quantities from 2 pcs up to 1,000 pcs depending on your project scale — small sample packs or bulk workshop stock.\u003c\/p\u003e\n    \u003cp\u003eTypical applications include timber deck construction with black carriage bolts for a uniform look, DIY furniture assembly requiring tamper-resistant fasteners, and metal fabrication projects where metric cup square bolts need to resist rotation without a secondary tool. The ISO metric coarse thread ensures compatibility with standard metric nuts and washers across all sizes.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e\n    \u003cstrong\u003eCompatibility:\u003c\/strong\u003e ISO metric coarse thread — M3, M4, M5, M6. Compatible with standard metric hex nuts, flange nuts, and flat washers. \u003cstrong\u003eNot compatible\u003c\/strong\u003e with UNC\/UNF imperial hardware.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-note\"\u003e\n    \u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e\n    \u003cstrong\u003eSizing note:\u003c\/strong\u003e The square neck is most effective in wood or soft materials. For metal-to-metal use, a square punched hole or anti-rotation plate is generally required. Confirm your stack-up thickness before selecting bolt length.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e✅ Key Features of These Black Cup Square Carriage Bolts\u003c\/h2\u003e\n  \u003cul class=\"hdiy-features\"\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔒\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eSelf-Locking Square Neck\u003c\/strong\u003e — The square shank section below the head embeds into wood or soft material, preventing rotation while you tighten the nut — no wrench needed on the bolt side.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚫\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eBlack Domed Head Finish\u003c\/strong\u003e — The smooth cup square head delivers a clean, finished appearance on the visible face, making these bolts a practical choice for exposed joinery and furniture builds.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eA2-70 Stainless Steel Construction\u003c\/strong\u003e — Grade 304 stainless with a minimum tensile strength of 700 MPa provides solid corrosion resistance for indoor, sheltered outdoor, and general structural use.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eWide Size Range — M3 to M6, 8mm to 80mm\u003c\/strong\u003e — Covers the most common metric carriage bolt sizes for DIY and light fabrication, from small cabinet hardware up to structural timber connections.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlexible Quantity Options\u003c\/strong\u003e — Available from 2 pcs for a quick repair to 1,000 pcs for workshop stock, so you only buy what you need without overpaying for a fixed pack size.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eStandard ISO Metric Thread\u003c\/strong\u003e — Coarse metric thread pitch on all sizes ensures straightforward compatibility with off-the-shelf metric nuts, washers, and threaded inserts — no specialty hardware required.\u003c\/span\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003e📐 Technical Specifications — Black Carriage Bolts (Cup Square Domed Head)\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eCup Square (Carriage \/ Domed)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eDrive Style\u003c\/th\u003e\n\u003ctd\u003eNone (square neck, nut-driven)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eA2-70 Stainless Steel (Grade 304)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish \/ Color\u003c\/th\u003e\n\u003ctd\u003eBlack surface treatment\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eISO Metric Coarse (DIN 603)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Diameter\u003c\/th\u003e\n\u003ctd\u003eM3, M4, M5, M6\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e8mm (≈5\/16\") – 80mm (≈3-1\/8\") — see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTensile Strength\u003c\/th\u003e\n\u003ctd\u003e700 MPa (A2-70 grade)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e2 \/ 5 \/ 10 \/ 20 \/ 25 \/ 40 \/ 50 \/ 100 \/ 200 \/ 250 \/ 400 \/ 500 \/ 1000 Pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCompatible Fasteners\u003c\/th\u003e\n\u003ctd\u003eStandard metric hex nuts, flange nuts, flat washers (M3–M6)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eRecommended Use\u003c\/th\u003e\n\u003ctd\u003eWood joinery, furniture assembly, light structural fabrication\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eSee variant options \/ Contact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-faq\"\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right bolt length for my project?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eAs a general rule, the bolt length should equal the combined thickness of all materials being joined, plus enough thread engagement for the nut — typically at least 1× the bolt diameter. For example, joining two 10mm boards with an M5 bolt would generally require at least 25mm (≈1\"): 20mm of material plus ~5mm for the nut. Always measure your stack-up before ordering. Quick inch reference: 25mm ≈ 1\", 50mm ≈ 2\", 80mm ≈ 3-1\/8\".\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat grade is the stainless steel and what load can these bolts handle?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese bolts are A2-70 stainless steel (equivalent to 304 grade), with a minimum tensile strength of 700 MPa. Actual load capacity depends on the bolt diameter, length, and application — an M6 bolt will generally carry significantly more load than an M3. For safety-critical structural applications, consult an engineer and verify load ratings against your specific design requirements.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these bolts suitable for outdoor or marine environments?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA2 stainless steel offers good corrosion resistance and is generally suitable for outdoor use in most climates. For highly aggressive environments — prolonged saltwater exposure, coastal spray zones — A4 (316) stainless is typically recommended. The black surface finish may show wear over time in harsh conditions, though the underlying stainless steel will remain corrosion-resistant.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat thread standard do these use — are they compatible with standard metric nuts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eYes. These bolts use standard ISO metric coarse threads (DIN 603 specification) in M3, M4, M5, and M6. They are compatible with any standard metric hex nut, flange nut, or wing nut of the matching size. They are \u003cstrong\u003enot\u003c\/strong\u003e compatible with UNC or UNF imperial threaded hardware.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is a cup square carriage bolt head and how does the square neck work?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA cup square (carriage bolt) head has a smooth rounded dome on top with no drive recess — it's designed to sit flush and clean on the visible face. Directly below the head is a short square shank section. When inserted into a pre-drilled round hole in wood, the square section bites into the material as the nut is tightened, locking the bolt against rotation. This means you can tighten the nut with one hand and one tool, with no need to hold the bolt head.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use these in wood, metal, and plastic assemblies?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eYes — these carriage bolts work in wood-to-wood, wood-to-metal, and metal-to-metal assemblies. The square neck is most effective in wood or softer materials where it can embed and resist rotation. For metal-to-metal use, a square punched hole or an anti-rotation plate is generally needed to prevent spinning. They are also suitable for use with plastic panels when the hole is sized appropriately.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I convert these bolt lengths from mm to inches?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eQuick reference conversions for the sizes in this listing: 8mm ≈ 5\/16\", 10mm ≈ 3\/8\", 12mm ≈ 15\/32\", 16mm ≈ 5\/8\", 20mm ≈ 25\/32\", 25mm ≈ 1\", 30mm ≈ 1-3\/16\", 35mm ≈ 1-3\/8\", 40mm ≈ 1-9\/16\", 45mm ≈ 1-3\/4\", 50mm ≈ 2\", 60mm ≈ 2-3\/8\", 70mm ≈ 2-3\/4\", 80mm ≈ 3-1\/8\".\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I decide between M3, M4, M5, and M6 for my application?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThread diameter selection generally depends on the load and the material thickness. M3 is typically used for light-duty applications like electronics enclosures or thin sheet assemblies. M4 suits small furniture and light brackets. M5 is a common general-purpose size for furniture, shelving, and light structural work. M6 is appropriate for heavier structural timber connections, outdoor furniture, and applications requiring higher clamping force. When in doubt, size up — a larger bolt in a slightly oversized hole is easier to work with than an undersized bolt under load.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your \u003cstrong\u003esize and quantity\u003c\/strong\u003e above, then add to cart — ships from our US warehouse.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M3 \/ 8mm \/ 50PCS","offer_id":52308596687122,"sku":"WBJHHZUV003LS001x1","price":9.04,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 10mm \/ 50PCS","offer_id":52308596719890,"sku":"WBJHHZUV003LS002x1","price":9.32,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 12mm \/ 50PCS","offer_id":52308596752658,"sku":"WBJHHZUV003LS003x1","price":9.79,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 16mm \/ 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1000PCS","offer_id":52308600455442,"sku":"WBJHHZUV003LS005x20","price":239.22,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 25mm \/ 400PCS","offer_id":52308600488210,"sku":"WBJHHZUV003LS006x20","price":116.42,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 30mm \/ 400PCS","offer_id":52308600520978,"sku":"WBJHHZUV003LS007x20","price":136.07,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 10mm \/ 400PCS","offer_id":52308600553746,"sku":"WBJHHZUV003LS008x20","price":139.94,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 12mm \/ 400PCS","offer_id":52308600586514,"sku":"WBJHHZUV003LS009x20","price":153.61,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 16mm \/ 400PCS","offer_id":52308600619282,"sku":"WBJHHZUV003LS010x20","price":178.23,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 20mm \/ 200PCS","offer_id":52308600652050,"sku":"WBJHHZUV003LS011x20","price":98.46,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 25mm \/ 200PCS","offer_id":52308600684818,"sku":"WBJHHZUV003LS012x20","price":116.14,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 30mm \/ 200PCS","offer_id":52308600717586,"sku":"WBJHHZUV003LS013x20","price":131.44,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 35mm \/ 200PCS","offer_id":52308600750354,"sku":"WBJHHZUV003LS014x20","price":143.28,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 40mm \/ 200PCS","offer_id":52308600783122,"sku":"WBJHHZUV003LS015x20","price":161.09,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 10mm \/ 400PCS","offer_id":52308600815890,"sku":"WBJHHZUV003LS016x20","price":199.24,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 12mm \/ 400PCS","offer_id":52308600848658,"sku":"WBJHHZUV003LS017x20","price":222.36,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 16mm \/ 200PCS","offer_id":52308600881426,"sku":"WBJHHZUV003LS018x20","price":130.56,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 20mm \/ 200PCS","offer_id":52308600914194,"sku":"WBJHHZUV003LS019x20","price":150.42,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 25mm \/ 200PCS","offer_id":52308600946962,"sku":"WBJHHZUV003LS020x20","price":164.56,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 30mm \/ 200PCS","offer_id":52308600979730,"sku":"WBJHHZUV003LS021x20","price":186.59,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 35mm \/ 100PCS","offer_id":52308601012498,"sku":"WBJHHZUV003LS022x20","price":119.82,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 40mm \/ 100PCS","offer_id":52308601045266,"sku":"WBJHHZUV003LS023x20","price":132.74,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 45mm \/ 100PCS","offer_id":52308601078034,"sku":"WBJHHZUV003LS024x20","price":144.64,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 50mm \/ 100PCS","offer_id":52308601110802,"sku":"WBJHHZUV003LS025x20","price":156.06,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 12mm \/ 100PCS","offer_id":52308601143570,"sku":"WBJHHZUV003LS026x20","price":96.36,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 16mm \/ 100PCS","offer_id":52308601176338,"sku":"WBJHHZUV003LS027x20","price":103.09,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 20mm \/ 100PCS","offer_id":52308601209106,"sku":"WBJHHZUV003LS028x20","price":116.48,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 25mm \/ 100PCS","offer_id":52308601241874,"sku":"WBJHHZUV003LS029x20","price":131.38,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 30mm \/ 100PCS","offer_id":52308601274642,"sku":"WBJHHZUV003LS030x20","price":147.97,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 35mm \/ 100PCS","offer_id":52308601307410,"sku":"WBJHHZUV003LS031x20","price":160.89,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 40mm \/ 100PCS","offer_id":52308601340178,"sku":"WBJHHZUV003LS032x20","price":180.34,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 45mm \/ 100PCS","offer_id":52308601372946,"sku":"WBJHHZUV003LS033x20","price":196.38,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 50mm \/ 100PCS","offer_id":52308601405714,"sku":"WBJHHZUV003LS034x20","price":210.94,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 60mm \/ 100PCS","offer_id":52308601438482,"sku":"WBJHHZUV003LS035x20","price":250.72,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 70mm \/ 40PCS","offer_id":52308601471250,"sku":"WBJHHZUV003LS036x20","price":118.12,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 80mm \/ 40PCS","offer_id":52308601504018,"sku":"WBJHHZUV003LS037x20","price":132.53,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-01_159b327d-acf1-4d7b-8831-d2ea5b67a500.jpg?v=1780501869"},{"product_id":"a2-304-stainless-steel-carriage-bolts-cup-square-dome-coach-screws-m6-m8-m10-m12","title":"A2 304 Stainless Steel Carriage Bolts — Cup Square Dome Coach Screws M6 M8 M10 M12","description":"\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose the right bolt length for my project?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"As a general rule, the bolt length should equal the total thickness of the materials being joined plus enough thread engagement for the nut — typically at least 1× the bolt diameter. For example, joining two 20mm (≈3\/4\\u201d) boards with an M8 bolt would generally require a bolt of at least 50mm (≈2\\u201d). When in doubt, size up by one increment.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the tensile strength of A2 304 stainless steel carriage bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A2 304 stainless steel carriage bolts typically have a tensile strength of around 500–700 MPa (≈72,000–101,000 psi), depending on diameter and manufacturing process. They are generally rated to property class 70 per ISO 3506. For structural or load-bearing applications, always verify the specific load requirements with an engineer.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these carriage bolts suitable for outdoor and marine use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. A2 304 stainless steel offers excellent corrosion resistance in most outdoor environments, including rain, humidity, and mild coastal exposure. For highly aggressive marine environments with direct saltwater spray, A4 316 stainless steel is generally recommended. These bolts are well-suited for decking, fencing, pergolas, and general outdoor construction.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What thread standard do these carriage bolts use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These carriage bolts use standard metric coarse threads (ISO 68-1 \/ DIN 603 profile). M6 typically has a 1.0mm pitch, M8 has 1.25mm, M10 has 1.5mm, and M12 has 1.75mm. They are compatible with standard metric hex nuts and washers of the same diameter.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between a carriage bolt and a regular hex bolt?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A carriage bolt (also called a coach screw or cup square bolt) features a smooth, domed head with a square shank section directly beneath it. When driven into wood, the square section bites into the material and prevents the bolt from spinning, so you only need a wrench on the nut side. This makes them ideal for wood-to-wood and wood-to-metal connections where one side is inaccessible.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do I need a washer with these carriage bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A flat washer under the nut is generally recommended to distribute the clamping load and protect the surface of the material. The domed head side typically does not require a washer. Using a washer also helps prevent the nut from pulling through softer materials like timber.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these bolts with pressure-treated lumber?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. A2 304 stainless steel is generally compatible with modern ACQ and CA pressure-treated lumber. Unlike standard zinc-plated hardware, stainless steel resists the accelerated corrosion that treated wood chemicals can cause. Always check the lumber manufacturer's recommendations for fastener compatibility.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eA2 304 Stainless Steel Carriage Bolts — Reliable Fastening for Wood \u0026amp; Structural Projects\u003c\/h2\u003e\n    \u003cp\u003eAnyone who has wrestled with a spinning bolt while trying to tighten a nut single-handed knows the frustration. Whether you're building a deck, assembling a pergola, or securing fence rails, you need a fastener that locks itself in place and stays put — even years later when the weather has done its worst. These A2 304 stainless steel carriage bolts are designed for exactly that: one-sided installation with a self-anchoring square shank, and long-term corrosion resistance that keeps joints tight and rust-free.\u003c\/p\u003e\n    \u003cp\u003eEach bolt features the classic cup square dome (coach screw) head profile — a smooth, low-profile dome on top and a square shoulder beneath that bites into timber to prevent rotation. Available in thread diameters M6, M8, M10, and M12, with lengths ranging from 12mm (≈1\/2\") to 100mm (≈3-15\/16\"), and sold in quantities of 1, 2, 5, 10, 20, or 50 pieces so you can order exactly what your job requires. All bolts conform to the DIN 603 standard and carry standard metric coarse threads.\u003c\/p\u003e\n    \u003cp\u003eThese stainless steel coach screws are a go-to choice for outdoor decking and pergola construction, timber frame connections, garden furniture assembly, and marine-adjacent structures such as docks and boat sheds. Their smooth dome head also suits visible joinery where aesthetics matter alongside function.\u003c\/p\u003e\n    \u003cdiv class=\"hdiy-note\"\u003e\n\u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e Always confirm the required bolt length by measuring total material thickness before ordering. If you need a size not listed, contact us to confirm availability.\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e\n    Compatible with standard metric hex nuts and flat washers (M6 \/ M8 \/ M10 \/ M12). Threads conform to ISO 68-1 metric coarse pitch. Suitable for use with timber, steel plate, and composite materials.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e✅ Key Features of These A2 Stainless Steel Carriage Bolts\u003c\/h2\u003e\n  \u003cul class=\"hdiy-features\"\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eA2 304 Stainless Steel Construction\u003c\/strong\u003e — Manufactured from A2 304 stainless steel for dependable corrosion resistance in outdoor, humid, and mildly coastal environments — no rust staining on your timber over time.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔲\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eSelf-Locking Cup Square Shank\u003c\/strong\u003e — The square shoulder beneath the dome head embeds into wood grain on installation, preventing the bolt from spinning so you can tighten the nut from one side without holding the head.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eWide Size Range — M6 to M12, 12mm to 100mm\u003c\/strong\u003e — Four thread diameters and up to fifteen length options per diameter let you match the exact fastener to your structural requirement, from light furniture joints to heavy timber framing.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e — Order 1, 2, 5, 10, 20, or 50 pieces per variant so you can buy a single replacement bolt or stock up for a large decking or fencing project without overspending.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eDIN 603 Standard Profile\u003c\/strong\u003e — Conforms to DIN 603 cup square bolt geometry, ensuring dimensional compatibility with standard metric nuts, washers, and pre-drilled jigs used in timber construction.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🌿\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eCompatible with Treated Lumber\u003c\/strong\u003e — A2 stainless steel resists the accelerated corrosion caused by ACQ and CA pressure-treatment chemicals, making these carriage bolts a sound choice for treated decking, retaining walls, and landscape structures.\u003c\/span\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003e📐 Technical Specifications — A2 304 Stainless Steel Carriage Bolts (DIN 603)\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eCarriage Bolt \/ Cup Square Dome Coach Screw\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eStandard\u003c\/th\u003e\n\u003ctd\u003eDIN 603\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eA2 304 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eProperty Class\u003c\/th\u003e\n\u003ctd\u003e70 (ISO 3506)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Diameters Available\u003c\/th\u003e\n\u003ctd\u003eM6, M8, M10, M12\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Type\u003c\/th\u003e\n\u003ctd\u003eMetric Coarse (ISO 68-1)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Pitch\u003c\/th\u003e\n\u003ctd\u003eM6: 1.0mm | M8: 1.25mm | M10: 1.5mm | M12: 1.75mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eLengths Available\u003c\/th\u003e\n\u003ctd\u003e12mm (≈1\/2\") – 100mm (≈3-15\/16\"); see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eDome (Cup Square \/ Coach Screw)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eDrive Style\u003c\/th\u003e\n\u003ctd\u003eNo drive — nut-side tightening only\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eMill \/ Natural Stainless\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePack Quantities\u003c\/th\u003e\n\u003ctd\u003e1, 2, 5, 10, 20, 50 pcs — see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCompatible Nut \/ Washer\u003c\/th\u003e\n\u003ctd\u003eStandard metric hex nut + flat washer (same diameter)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSuitable Substrates\u003c\/th\u003e\n\u003ctd\u003eTimber, plywood, steel plate, composite board\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOutdoor \/ Corrosion Rating\u003c\/th\u003e\n\u003ctd\u003eSuitable for outdoor use; not recommended for direct saltwater immersion\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-faq\"\u003e\n    \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right bolt length for my project?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eAs a general rule, the bolt length should equal the total thickness of the materials being joined plus enough thread engagement for the nut — typically at least 1× the bolt diameter. For example, joining two 20mm (≈3\/4\") boards with an M8 bolt would generally require a bolt of at least 50mm (≈2\"). When in doubt, size up by one increment. Lengths in this listing run from 12mm (≈1\/2\") to 100mm (≈3-15\/16\").\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the tensile strength of these A2 304 stainless steel carriage bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA2 304 stainless steel carriage bolts are typically rated to property class 70 per ISO 3506, with a tensile strength of generally around 500–700 MPa (≈72,000–101,000 psi) depending on diameter. For structural or load-bearing applications, always verify specific load requirements with a qualified engineer.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these carriage bolts suitable for outdoor and marine environments?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eYes — A2 304 stainless steel provides excellent corrosion resistance for most outdoor applications including decking, fencing, pergolas, and garden structures exposed to rain and humidity. For highly aggressive marine environments with direct saltwater spray or immersion, A4 316 stainless steel is generally the preferred choice. These bolts are well-suited for coastal-adjacent (but not waterfront) installations.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat thread standard do these bolts use, and what nuts are compatible?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese carriage bolts use standard metric coarse threads per ISO 68-1 \/ DIN 603. Typical pitches are: M6 × 1.0mm, M8 × 1.25mm, M10 × 1.5mm, M12 × 1.75mm. They are compatible with any standard metric hex nut and flat washer of the matching diameter. No special tooling is required.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the difference between a carriage bolt and a regular hex bolt?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA carriage bolt (coach screw \/ cup square bolt) has a smooth, domed head with a square shank section directly beneath it. When driven into timber, the square section bites into the wood and prevents the bolt from rotating, so you only need a wrench on the nut side. This makes them ideal for wood-to-wood and wood-to-metal connections where one face is inaccessible. A standard hex bolt requires a wrench or socket on both ends.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDo I need a washer with these carriage bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA flat washer under the nut is generally recommended to distribute the clamping load and protect the surface of the material. The domed head side typically does not require a washer. Using a washer also helps prevent the nut from pulling through softer or thinner materials. For best results, use an A2 stainless steel washer to match the bolt material and avoid galvanic corrosion.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use these bolts with ACQ or CA pressure-treated lumber?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eYes. A2 304 stainless steel is generally compatible with modern ACQ (Alkaline Copper Quaternary) and CA (Copper Azole) pressure-treated lumber. Unlike standard zinc-plated or hot-dip galvanized hardware, stainless steel resists the accelerated corrosion that copper-based treatment chemicals can cause. Always check the lumber manufacturer's fastener recommendations for your specific treatment type.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your thread diameter, length, and quantity above, then add to cart — ships from our US warehouse.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M6 \/ 12mm \/ 1PCS","offer_id":52308602487058,"sku":"CXH7303x1","price":1.48,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 12mm \/ 5PCS","offer_id":52308602519826,"sku":"CXH7303x5","price":4.07,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 12mm \/ 10PCS","offer_id":52308602552594,"sku":"CXH7303x10","price":5.78,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 12mm \/ 20PCS","offer_id":52308602585362,"sku":"CXH7303x20","price":9.59,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 12mm \/ 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For M4 bolts, that means at least 6mm of thread beyond the material. Available lengths range from 10mm (3\/8\\u2033) to 30mm (1-3\/16\\u2033).\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the tensile strength of G304 stainless steel carriage bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"G304 (A2) stainless steel carriage bolts typically have a tensile strength of around 500–700 MPa, which is generally sufficient for light-to-medium structural and woodworking applications. For heavy load-bearing applications, contact us to confirm suitability.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these carriage bolts suitable for outdoor or marine use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. G304 stainless steel offers good corrosion resistance in most outdoor environments including rain, humidity, and mild coastal conditions. For highly aggressive marine or saltwater environments, G316 stainless steel is generally recommended instead.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What thread standard do these M4 carriage bolts use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These bolts conform to DIN 603, which uses standard M4 metric coarse thread (pitch typically 0.7mm). They are compatible with any standard M4 metric nut or threaded insert.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What nut size should I use with M4 carriage bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Use a standard M4 metric nut. A flat washer under the nut is recommended when fastening into softer materials like wood or plastic to distribute the clamping load and prevent pull-through.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How does the cup square neck prevent the bolt from spinning?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The square section directly under the dome head is designed to bite into wood or seat into a square hole in metal, locking the bolt in place so you can tighten the nut from one side without needing to hold the bolt head.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these bolts with aluminum or plastic panels?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"In most cases, yes. The smooth dome head provides a clean, low-profile finish on the face side. For thin or soft panels, use a backing washer to prevent the square neck from pulling through. Contact us to confirm for specific applications.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003c!-- ① OVERVIEW --\u003e\n  \u003ch2\u003eM4 Carriage Bolts in G304 Stainless Steel — Secure, Rust-Resistant Fastening for Wood \u0026amp; Metal\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003cp\u003eWhether you're building a deck, assembling outdoor furniture, or fastening timber frames, the last thing you want is a bolt that spins freely when you try to tighten the nut — or one that rusts out after a single rainy season. These M4 carriage bolts are built to solve both problems, making them a go-to choice for woodworkers, DIYers, and contractors who need a reliable, corrosion-resistant fastener.\u003c\/p\u003e\n    \u003cp\u003eEach bolt is manufactured to \u003cstrong\u003eDIN 603\u003c\/strong\u003e standard in \u003cstrong\u003eG304 (A2) stainless steel\u003c\/strong\u003e, featuring a smooth dome head with a cup square neck beneath it. Available in nine lengths from \u003cstrong\u003e10mm (3\/8\")\u003c\/strong\u003e to \u003cstrong\u003e30mm (1-3\/16\")\u003c\/strong\u003e, sold in pack sizes of 1, 5, 10, 25, 50, or 100 pieces — so you can grab a single bolt for a repair or stock up for a full project run.\u003c\/p\u003e\n    \u003cp\u003eTypical applications include timber deck construction, garden gate hardware, outdoor furniture assembly, and light structural woodworking where a flush, tamper-resistant dome head finish is required. The M4 thread size makes these M4 stainless steel carriage bolts ideal for thinner stock and precision joinery where larger bolts would split the material.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- ② COMPATIBILITY BAR --\u003e\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e\n    \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Fits standard \u003cstrong\u003eM4 metric nuts\u003c\/strong\u003e (pitch typically 0.7mm) \u0026amp; M4 flat washers. Conforms to \u003cstrong\u003eDIN 603\u003c\/strong\u003e. Suitable for wood, metal, and composite panel applications.\n  \u003c\/div\u003e\n\n  \u003c!-- ③ KEY FEATURES --\u003e\n  \u003ch2\u003e✅ Key Features of These M4 Stainless Steel Carriage Bolts\u003c\/h2\u003e\n  \u003cul class=\"hdiy-features\"\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🦺\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eG304 Stainless Steel Construction\u003c\/strong\u003e — Provides reliable corrosion resistance in outdoor, humid, and mildly coastal environments, keeping your fasteners looking clean and performing long-term.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🔲\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eCup Square Anti-Spin Neck\u003c\/strong\u003e — The square shoulder under the dome head locks into wood grain or a pre-drilled square hole, letting you tighten the nut single-handed without the bolt rotating.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eDIN 603 Standard Compliance\u003c\/strong\u003e — Manufactured to the internationally recognized DIN 603 carriage bolt specification, ensuring consistent thread pitch and dimensional accuracy across every piece.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eNine Length Options (10–30mm)\u003c\/strong\u003e — From 10mm (3\/8\") to 30mm (1-3\/16\"), you can match the bolt length precisely to your material stack without over-penetration or insufficient thread engagement.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🧹\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eSmooth Dome Head Finish\u003c\/strong\u003e — The low-profile rounded head sits flush against the surface, eliminating sharp edges and giving a clean, finished appearance on visible face sides of furniture or structures.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eFlexible Pack Sizes (1–100 Pcs)\u003c\/strong\u003e — Order exactly what you need — a single replacement bolt or a bulk pack of 100 for ongoing projects — with per-unit cost decreasing as quantity increases.\u003c\/span\u003e\n    \u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003c!-- ④ TECHNICAL SPECIFICATIONS --\u003e\n  \u003ch2\u003e📐 Technical Specifications — M4 DIN 603 Carriage Bolts\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Diameter\u003c\/th\u003e\n\u003ctd\u003eM4 (4mm \/ 5\/32\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Pitch\u003c\/th\u003e\n\u003ctd\u003e0.7mm (metric coarse)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eStandard\u003c\/th\u003e\n\u003ctd\u003eDIN 603\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eCup Square Dome (Mushroom Head)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eDrive Style\u003c\/th\u003e\n\u003ctd\u003eNone — nut-driven (anti-spin square neck)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eG304 Stainless Steel (A2)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural stainless (brushed\/mill finish)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e10mm (3\/8\"), 12mm (15\/32\"), 14mm (35\/64\"), 16mm (5\/8\"), 18mm (45\/64\"), 20mm (25\/32\"), 22mm (55\/64\"), 25mm (63\/64\"), 30mm (1-3\/16\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePack Sizes\u003c\/th\u003e\n\u003ctd\u003e1, 5, 10, 25, 50, 100 Pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCompatible Nut\u003c\/th\u003e\n\u003ctd\u003eStandard M4 metric nut\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCorrosion Resistance\u003c\/th\u003e\n\u003ctd\u003eGood — outdoor \u0026amp; humid environments (see FAQ for marine use)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-note\"\u003e\n    \u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e\n    \u003cstrong\u003eNot sure which length to order?\u003c\/strong\u003e Measure the total thickness of your materials, then add at least 6mm (1\/4\") for nut engagement. When in doubt, size up — a slightly longer bolt is easier to work with than one that's too short.\n  \u003c\/div\u003e\n\n  \u003c!-- ⑤ FAQ --\u003e\n  \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-faq\"\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right length for M4 carriage bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eGenerally, select a bolt length equal to the total thickness of the materials being joined, plus enough thread for the nut — typically at least 1.5× the bolt diameter. For M4 bolts, that means at least 6mm of exposed thread beyond the material. Available lengths run from 10mm (3\/8\") to 30mm (1-3\/16\"), so measure your stack before ordering.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the tensile strength of G304 stainless steel carriage bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eG304 (A2) stainless steel carriage bolts typically have a tensile strength of around 500–700 MPa, which is generally sufficient for light-to-medium structural and woodworking applications. For heavy load-bearing or safety-critical uses, contact us to confirm suitability for your specific application.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these carriage bolts suitable for outdoor or marine use?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eYes, for most outdoor applications. G304 stainless steel offers good corrosion resistance in rain, humidity, and mild coastal conditions — making it a solid choice for decks, fences, and garden structures. For highly aggressive marine or saltwater environments, G316 stainless steel is generally recommended instead.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat thread standard do these M4 carriage bolts use?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese bolts conform to \u003cstrong\u003eDIN 603\u003c\/strong\u003e and use standard M4 metric coarse thread with a pitch of typically 0.7mm. They are compatible with any standard M4 metric nut or threaded insert — no special tooling required.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat nut and washer should I use with M4 carriage bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eUse a standard M4 metric nut. When fastening into softer materials like wood, plywood, or plastic, placing an M4 flat washer under the nut is recommended to distribute the clamping load and prevent the nut from pulling into the surface over time.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow does the cup square neck prevent the bolt from spinning?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThe square section directly beneath the dome head is designed to bite into wood fibers or seat into a matching square hole in metal or composite panels. This locks the bolt rotationally, so you can tighten the nut from one side without needing to hold the bolt head — a key advantage in tight spaces or when working alone.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use these bolts with aluminum or plastic panels?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eIn most cases, yes. The smooth dome head provides a clean, low-profile finish on the face side. For thin or soft panels, use a backing washer to prevent the square neck from pulling through the material. Contact us to confirm compatibility for specific panel thicknesses or load requirements.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003c!-- ⑥ CTA BAR --\u003e\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your \u003cstrong\u003elength and pack size\u003c\/strong\u003e above, then add to cart — ships from our US warehouse.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M4 \/ 10mm \/ 1PCS","offer_id":52308610810130,"sku":"DTVKA7710x1","price":3.25,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 12mm \/ 1PCS","offer_id":52308610842898,"sku":"DTVKA7711x1","price":3.41,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 14mm \/ 1PCS","offer_id":52308610875666,"sku":"DTVKA7712x1","price":3.41,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 16mm \/ 1PCS","offer_id":52308610908434,"sku":"DTVKA7713x1","price":3.41,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 18mm \/ 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100PCS","offer_id":52308612546834,"sku":"DTVKA7718x100","price":68.2,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/3_14_d579596a-9752-4b03-b2ca-cc01e36d1b15.jpg?v=1780501869"},{"product_id":"black-88-grade-steel-carriage-bolts-cup-square-dome-head-m6-m24","title":"Black 8.8 Grade Steel Carriage Bolts | Cup Square Dome Head | M6–M24","description":"\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose the right length for my carriage bolt?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Generally, the bolt length should equal the total thickness of all materials being joined plus enough thread engagement for the nut — typically at least 1× the bolt diameter. For example, joining two 20mm (≈3\/4\\u2033) boards with an M8 bolt, a 50mm (≈2\\u2033) bolt is typically sufficient. Always add a washer and nut to your calculation.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does 8.8 grade mean for carriage bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Grade 8.8 indicates a minimum tensile strength of 800 MPa and a yield strength of 640 MPa. These bolts are generally suitable for structural and load-bearing applications in wood, metal, and composite assemblies.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can these black carriage bolts be used outdoors?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The black oxide finish provides mild corrosion resistance and is generally suitable for dry or semi-exposed indoor applications. For prolonged outdoor or high-humidity exposure, we recommend applying a protective coating or using stainless steel fasteners instead.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What thread standard do these carriage bolts use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These bolts use standard metric coarse thread (ISO 898-1), compatible with standard metric nuts and threaded inserts of the same diameter and pitch.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What nut size do I need for each bolt diameter?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Match the nut to the bolt diameter: M6 bolts use M6 nuts, M8 bolts use M8 nuts, and so on. Standard metric hex nuts (DIN 934) are generally compatible with these carriage bolts.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How does the square neck on a carriage bolt work?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The square neck sits directly beneath the dome head. When driven into a pre-drilled square or round hole in wood or soft material, the neck bites into the material and prevents the bolt from spinning while you tighten the nut — no wrench needed on the bolt head.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between a carriage bolt and a hex bolt?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A carriage bolt has a smooth, rounded dome head with a square anti-rotation neck — designed to be tightened from one side only, making it ideal for wood-to-wood or wood-to-metal connections. A hex bolt has a hexagonal head that requires a wrench on both ends for installation.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eBlack 8.8 Grade Steel Carriage Bolts — Secure, Clean, and Ready to Work\u003c\/h2\u003e\n    \u003cp\u003eWhen you need a fastener that locks itself in place without a second wrench, black carriage bolts are the go-to choice for woodworkers, fabricators, and DIY builders. Whether you're assembling a deck frame, building a workbench, or connecting structural timbers, a loose bolt that spins during tightening wastes time and strips holes. These M6–M24 black 8.8 grade steel carriage bolts solve that problem with a self-anchoring square neck that bites into the material the moment you start threading the nut.\u003c\/p\u003e\n    \u003cp\u003eEach bolt features a smooth cup square dome head (round profile, no drive recess) and a square anti-rotation neck beneath it, machined from 8.8 grade carbon steel with a black oxide finish. Sizes range from M6 through M24 in diameter, with lengths from 20mm (≈3\/4\") to 150mm (≈5-7\/8\") depending on the diameter. Packs are available in 5, 10, or 20 pieces to match your project scale — no need to buy more than you need.\u003c\/p\u003e\n    \u003cp\u003eThese cup square dome head bolts are widely used in timber frame construction, garden furniture assembly, playground equipment, steel-to-wood connections, and general structural joinery. The metric coarse thread pattern makes them compatible with standard M-series hex nuts and washers for carriage bolt wood connections across a wide range of applications.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e\n    \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Standard metric coarse thread (ISO 898-1). Compatible with M6–M24 metric hex nuts (DIN 934) and flat washers. Fits pre-drilled round holes — the square neck self-locks in wood and soft composite materials.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e✅ Key Features of These Black 8.8 Grade Steel Carriage Bolts\u003c\/h2\u003e\n  \u003cul class=\"hdiy-features\"\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔒\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eSelf-Anchoring Square Neck\u003c\/strong\u003e — The square shoulder under the dome head bites into wood or soft material on tightening, preventing spin-out without a second tool — ideal for one-sided carriage bolt installation in timber and composite panels.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e8.8 Grade Tensile Strength\u003c\/strong\u003e — Manufactured to ISO 898-1 Grade 8.8, with a minimum tensile strength of 800 MPa and yield strength of 640 MPa, making these bolts suitable for structural wood-to-wood and wood-to-metal load-bearing joints.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🖤\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eBlack Oxide Finish\u003c\/strong\u003e — The matte black surface treatment reduces surface reflectivity and provides mild corrosion resistance for indoor and semi-exposed environments, while giving a clean, consistent appearance on visible fastener heads.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eWide Size Range — M6 to M24\u003c\/strong\u003e — Available in nine diameter options (M6, M8, M10, M12, M14, M16, M18, M20, M24) and lengths from 20mm to 150mm, covering the most common metric carriage bolt sizes for residential and light commercial construction.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e — Choose 5, 10, or 20 pieces per pack depending on your project volume. Smaller packs suit repair jobs and prototyping; larger packs reduce per-unit cost for production runs and bulk framing work.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eStandard Metric Thread Compatibility\u003c\/strong\u003e — Metric coarse thread pitch follows ISO standards, ensuring these cup square dome screws pair correctly with off-the-shelf M-series nuts, washers, and threaded inserts without custom tooling or adapters.\u003c\/span\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003e📐 Technical Specifications — Black Carriage Bolts\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eCarriage Bolt (Cup Square Dome Head)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eCarbon Steel, Grade 8.8\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eBlack Oxide\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eRound dome (cup square), no drive recess\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eNeck Type\u003c\/th\u003e\n\u003ctd\u003eSquare anti-rotation neck\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eMetric Coarse (ISO 898-1)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eDiameter Range\u003c\/th\u003e\n\u003ctd\u003eM6 – M24\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eLength Range\u003c\/th\u003e\n\u003ctd\u003e20mm (≈3\/4\") – 150mm (≈5-7\/8\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Diameters\u003c\/th\u003e\n\u003ctd\u003eM6, M8, M10, M12, M14, M16, M18, M20, M24\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePack Quantities\u003c\/th\u003e\n\u003ctd\u003e5 pcs \/ 10 pcs \/ 20 pcs (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTensile Strength\u003c\/th\u003e\n\u003ctd\u003e800 MPa (Grade 8.8)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eYield Strength\u003c\/th\u003e\n\u003ctd\u003e640 MPa (Grade 8.8)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCompatible Nut Standard\u003c\/th\u003e\n\u003ctd\u003eDIN 934 Metric Hex Nut (same diameter)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eRecommended Application\u003c\/th\u003e\n\u003ctd\u003eWood-to-wood, wood-to-metal structural connections\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eDrive Tool Required\u003c\/th\u003e\n\u003ctd\u003eNone on bolt head — wrench on nut only\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-note\"\u003e\n    \u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e\n    \u003cstrong\u003eNote:\u003c\/strong\u003e Black oxide finish is not equivalent to hot-dip galvanizing or stainless steel. For prolonged outdoor or marine exposure, apply a topcoat sealant or contact us to confirm suitability for your environment.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-faq\"\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right length for my carriage bolt?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eGenerally, the bolt length should equal the total thickness of all materials being joined plus enough thread engagement for the nut — typically at least 1× the bolt diameter. For example, joining two 20mm (≈3\/4\") boards with an M8 bolt, a 50mm (≈2\") bolt is typically sufficient. Always factor in a flat washer and nut thickness when calculating your required length.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat does 8.8 grade mean, and is it strong enough for structural use?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eGrade 8.8 indicates a minimum tensile strength of 800 MPa and a yield strength of 640 MPa per ISO 898-1. These bolts are generally suitable for structural and load-bearing connections in timber framing, furniture, and light steel fabrication. For critical structural applications, always verify load requirements with an engineer.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan these black carriage bolts be used outdoors or in wet conditions?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThe black oxide finish provides mild corrosion resistance and is generally suitable for dry or semi-exposed indoor environments. For prolonged outdoor, high-humidity, or marine exposure, we recommend applying a protective topcoat (e.g., clear lacquer or wax) or switching to stainless steel fasteners. Contact us to confirm suitability for your specific environment.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat thread standard do these bolts use, and what nuts are compatible?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese carriage bolts use standard metric coarse thread (ISO 898-1). They are compatible with standard DIN 934 metric hex nuts of the same diameter — M6 nuts for M6 bolts, M8 nuts for M8 bolts, and so on. Standard metric flat washers (DIN 125) are also compatible.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow does the square neck prevent the bolt from spinning?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThe square shoulder sits directly beneath the dome head. When inserted into a pre-drilled hole in wood or soft composite material, the square neck embeds into the surrounding material as you tighten the nut, locking the bolt in place. This allows one-person installation — no wrench or tool needed on the bolt head side.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the difference between a carriage bolt and a hex bolt?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA carriage bolt has a smooth, rounded dome head with no drive recess and a square anti-rotation neck — designed for one-sided tightening, making it ideal for wood-to-wood or wood-to-metal connections where the head side is inaccessible. A hex bolt has a hexagonal head that requires a wrench on both ends. Carriage bolts also present a cleaner, tamper-resistant appearance on the visible face.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat hole size should I drill for these carriage bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eIn most cases, drill a round hole equal to the bolt's nominal diameter (e.g., 8mm hole for an M8 bolt). The square neck is typically slightly larger than the shank, so it will self-lock as you pull the bolt through. For harder materials, a slightly undersized hole may improve grip. Contact us to confirm exact neck dimensions for your specific size.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your size and quantity above, then add to cart — ships from our US warehouse.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M6 \/ 20mm \/ 20PCS","offer_id":52308613071122,"sku":"XYHBRT5-364x1","price":5.43,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 25mm \/ 20PCS","offer_id":52308613103890,"sku":"XYHBRT5-365x1","price":6.32,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 30mm \/ 20PCS","offer_id":52308613136658,"sku":"XYHBRT5-366x1","price":7.06,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 35mm \/ 20PCS","offer_id":52308613169426,"sku":"XYHBRT5-367x1","price":7.87,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 40mm \/ 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10PCS","offer_id":52308613660946,"sku":"XYHBRT5-382x1","price":12.85,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 80mm \/ 10PCS","offer_id":52308613693714,"sku":"XYHBRT5-383x1","price":12.31,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 90mm \/ 5PCS","offer_id":52308613726482,"sku":"XYHBRT5-384x1","price":7.68,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 100mm \/ 5PCS","offer_id":52308613759250,"sku":"XYHBRT5-385x1","price":8.01,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 20mm \/ 10PCS","offer_id":52308613792018,"sku":"XYHBRT5-386x1","price":8.69,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 25mm \/ 10PCS","offer_id":52308613824786,"sku":"XYHBRT5-387x1","price":9.78,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 30mm \/ 10PCS","offer_id":52308613857554,"sku":"XYHBRT5-388x1","price":10.87,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 35mm \/ 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\"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose the right bolt length for my project?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A general rule: bolt length should equal the total thickness of the materials being joined, plus typically 1–2 thread pitches beyond the nut. For example, joining two 10mm boards would generally call for a bolt of at least 20–25mm (about 13\/16\\\"–1\\\"). When in doubt, size up — you can always trim excess thread, but a bolt that's too short won't grip securely.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is A2 stainless steel and how strong is it?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A2 stainless steel (also known as 304 stainless) is an austenitic grade with a tensile strength of typically 500–700 MPa. It offers a solid balance of strength and corrosion resistance, making it suitable for most indoor and light outdoor fastening applications.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can these carriage bolts be used outdoors?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes, A2 stainless steel provides good resistance to rust and oxidation in most outdoor environments. It performs well in rain, humidity, and mild coastal conditions. For highly aggressive marine or saltwater environments, A4 (316) stainless would generally be a better choice.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What thread standard do these bolts use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These bolts follow the ISO metric coarse thread standard (DIN 603 profile). M3 typically has a 0.5mm pitch, M4 a 0.7mm pitch, and M5 a 0.8mm pitch. The included hex flange nuts are matched to the same metric coarse thread.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is a hex flange nut and why is it included?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A hex flange nut has a wide integrated washer-like flange at its base. This distributes clamping load over a larger surface area, reducing the chance of the nut pulling through softer materials like wood or plastic — making it a practical choice for DIY and furniture assembly.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do I need a separate washer with these bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"In most cases, no. The hex flange nut's built-in flange acts as an integrated washer on the nut side. On the bolt head side, the domed carriage bolt head seats flush against the material surface. For very soft materials, adding a flat washer under the bolt head is generally recommended.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I install a carriage bolt correctly?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Drill a hole matching the bolt diameter, insert the bolt from the front face, and tap the domed head flush so the square neck bites into the material — this prevents the bolt from spinning. Thread the hex flange nut from the back and tighten with a wrench. No tool is needed on the bolt head side.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003c!-- ① OVERVIEW --\u003e\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eM3–M5 Carriage Bolts with Hex Flange Nuts — Secure Metric Fastening in A2 Stainless Steel\u003c\/h2\u003e\n    \u003cp\u003eAnyone who has wrestled with a spinning bolt head mid-assembly knows the frustration. Whether you're building a garden bench, assembling flat-pack furniture, or reinforcing a wooden frame, you need a fastener that locks in place and stays put. These A2 stainless steel carriage bolts with hex flange nuts are designed for exactly that — the square neck under the domed head bites into the material on insertion, so you can tighten from one side without holding the bolt.\u003c\/p\u003e\n    \u003cp\u003eEach kit pairs a carriage bolt with a matching hex flange nut. Bolts are available in M3, M4, and M5 thread diameters with lengths ranging from 8mm (≈5\/16\") to 50mm (≈2\"), sold in quantities of 1 to 80 pieces per order. The material is A2 (304) stainless steel throughout — bolt and nut — providing consistent corrosion resistance and a clean, uniform finish.\u003c\/p\u003e\n    \u003cp\u003eThese metric carriage bolts with flange nuts are well-suited for outdoor furniture assembly, DIY woodworking projects, electronics enclosure mounting, and light structural connections where a flush, tamper-resistant bolt head is needed. The flange nut's integrated bearing surface makes them a practical choice for stainless steel fastener kits used in wood-to-wood or wood-to-metal applications.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- ② COMPATIBILITY BAR --\u003e\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e\n    \u003cstrong\u003eThread Standard:\u003c\/strong\u003e ISO Metric Coarse (DIN 603 profile) — M3 × 0.5mm pitch, M4 × 0.7mm pitch, M5 × 0.8mm pitch. Hex flange nuts are matched to the same metric coarse thread.\n  \u003c\/div\u003e\n\n  \u003c!-- ③ KEY FEATURES --\u003e\n  \u003ch2\u003e✅ Key Features of These Metric Carriage Bolts with Hex Flange Nuts\u003c\/h2\u003e\n  \u003cul class=\"hdiy-features\"\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔒\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eSelf-Locking Square Neck\u003c\/strong\u003e — The square shoulder under the domed head embeds into the material on installation, preventing rotation so you can tighten from one side only — no second wrench needed on the bolt.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🌊\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eA2 Stainless Steel Construction\u003c\/strong\u003e — Both bolt and nut are made from A2 (304) stainless steel, offering reliable resistance to rust, oxidation, and moisture in indoor and outdoor environments.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eWide Size Range\u003c\/strong\u003e — Available in M3, M4, and M5 diameters with lengths from 8mm (≈5\/16\") to 50mm (≈2\"), covering the most common metric carriage bolt sizes for DIY and light structural work.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eIntegrated Flange Nut\u003c\/strong\u003e — The hex flange nut's built-in washer flange distributes clamping load over a wider area, reducing pull-through risk in wood, MDF, and plastic — a practical upgrade over standard hex nuts.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlexible Quantity Options\u003c\/strong\u003e — Order as few as 1 piece for a repair or up to 80 pieces for a larger build, so you only buy what you need for your stainless steel fastener kit.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e✨\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eSmooth Domed Head Profile\u003c\/strong\u003e — The rounded carriage bolt head sits flush and snag-free on the visible face of your workpiece, giving a clean finish on furniture, gates, and outdoor structures.\u003c\/span\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003c!-- ④ TECHNICAL SPECIFICATIONS --\u003e\n  \u003ch2\u003e📐 Technical Specifications — Metric Carriage Bolt and Hex Flange Nut Kit\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eCarriage Bolt + Hex Flange Nut Kit\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Diameters\u003c\/th\u003e\n\u003ctd\u003eM3, M4, M5\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e8mm (≈5\/16\") — 50mm (≈2\"); see variant options for full list\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eISO Metric Coarse (DIN 603 bolt profile)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Pitch\u003c\/th\u003e\n\u003ctd\u003eM3: 0.5mm · M4: 0.7mm · M5: 0.8mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eA2 Stainless Steel (304)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural stainless, smooth domed head\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eRound \/ Domed (Carriage bolt)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eDrive Style\u003c\/th\u003e\n\u003ctd\u003eNo drive — square neck self-locks into material\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eNut Type\u003c\/th\u003e\n\u003ctd\u003eHex Flange Nut (integrated washer flange)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 \/ 5 \/ 10 \/ 20 \/ 30 \/ 50 \/ 80 pieces (bolt + nut pairs)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTensile Strength\u003c\/th\u003e\n\u003ctd\u003eTypically 500–700 MPa (A2-70 class)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCorrosion Resistance\u003c\/th\u003e\n\u003ctd\u003eGood — suitable for outdoor and humid environments\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-note\"\u003e\n    \u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e\n    \u003cstrong\u003eSize confirmation tip:\u003c\/strong\u003e Measure your material thickness before ordering. Bolt length is measured from under the head to the tip. If you need help selecting the right size, contact us to confirm.\n  \u003c\/div\u003e\n\n  \u003c!-- ⑤ FAQ --\u003e\n  \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-faq\"\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right bolt length for my project?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA general rule: bolt length should equal the total thickness of the materials being joined, plus typically 1–2 thread pitches beyond the nut. For example, joining two 10mm boards would generally call for a bolt of at least 20–25mm (about 13\/16\"–1\"). When in doubt, size up — you can always trim excess thread, but a bolt that's too short won't grip securely.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is A2 stainless steel and how strong is it?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA2 stainless steel (also known as 304 stainless) is an austenitic grade with a tensile strength of typically 500–700 MPa. It offers a solid balance of strength and corrosion resistance, making it suitable for most indoor and light outdoor fastening applications. For higher-load structural connections, consult an engineer.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan these carriage bolts be used outdoors?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eYes, A2 stainless steel provides good resistance to rust and oxidation in most outdoor environments. It performs well in rain, humidity, and mild coastal conditions. For highly aggressive marine or saltwater environments, A4 (316) stainless would generally be a better choice.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat thread standard do these bolts use — are they compatible with standard metric nuts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese bolts follow the ISO metric coarse thread standard (DIN 603 profile). M3 typically has a 0.5mm pitch, M4 a 0.7mm pitch, and M5 a 0.8mm pitch. The included hex flange nuts are matched to the same metric coarse thread, and in most cases they will also be compatible with standard ISO metric hex nuts of the same size.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is a hex flange nut and why is it better than a standard hex nut here?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA hex flange nut has a wide integrated washer-like flange at its base. This distributes clamping load over a larger surface area, reducing the chance of the nut pulling through softer materials like wood or plastic. It also eliminates the need for a separate washer on the nut side, simplifying assembly — a practical advantage for DIY woodworking and furniture projects.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDo I need a separate washer with these bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eIn most cases, no. The hex flange nut's built-in flange acts as an integrated washer on the nut side. On the bolt head side, the domed carriage bolt head seats flush against the material surface. For very soft materials (e.g., thin plywood or MDF), adding a flat washer under the bolt head is generally recommended to prevent the head from sinking in.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I install a carriage bolt correctly?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eDrill a hole matching the bolt diameter (e.g., 3mm hole for M3, 4mm for M4, 5mm for M5). Insert the bolt from the front face of the material and tap the domed head flush — the square neck will bite into the wood or material, preventing the bolt from spinning. Thread the hex flange nut from the back and tighten with a wrench. No tool is needed on the bolt head side, which is one of the key advantages of the carriage bolt design.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003c!-- ⑥ CTA BAR --\u003e\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your size and quantity above, then add to cart — ships from our US warehouse.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M3 \/ 8mm \/ 1PCS","offer_id":52308618281234,"sku":"GLFBLFFGLFBLFFDZ51441x1","price":1.97,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 10mm \/ 1PCS","offer_id":52308618314002,"sku":"GLFBLFFGLFBLFFDZ51442x1","price":1.97,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 12mm \/ 1PCS","offer_id":52308618346770,"sku":"GLFBLFFGLFBLFFDZ51443x1","price":1.97,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 14mm \/ 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50PCS","offer_id":52308623884562,"sku":"GLFBLFFGLFBLFFDZ51447x50","price":7.53,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 25mm \/ 50PCS","offer_id":52308623917330,"sku":"GLFBLFFGLFBLFFDZ51448x50","price":8.02,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 30mm \/ 50PCS","offer_id":52308623950098,"sku":"GLFBLFFGLFBLFFDZ51449x50","price":9.37,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 10mm \/ 50PCS","offer_id":52308623982866,"sku":"GLFBLFFGLFBLFFDZ51450x50","price":10.38,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 12mm \/ 50PCS","offer_id":52308624015634,"sku":"GLFBLFFGLFBLFFDZ51451x50","price":10.7,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 14mm \/ 50PCS","offer_id":52308624048402,"sku":"GLFBLFFGLFBLFFDZ51452x50","price":11.04,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 16mm \/ 50PCS","offer_id":52308624081170,"sku":"GLFBLFFGLFBLFFDZ51453x50","price":11.71,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 18mm \/ 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50PCS","offer_id":52308624343314,"sku":"GLFBLFFGLFBLFFDZ51461x50","price":14.85,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 12mm \/ 50PCS","offer_id":52308624376082,"sku":"GLFBLFFGLFBLFFDZ51462x50","price":15.35,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 14mm \/ 50PCS","offer_id":52308624408850,"sku":"GLFBLFFGLFBLFFDZ51463x50","price":16.18,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 16mm \/ 50PCS","offer_id":52308624441618,"sku":"GLFBLFFGLFBLFFDZ51464x50","price":16.84,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 8mm \/ 80PCS","offer_id":52308624474386,"sku":"GLFBLFFGLFBLFFDZ51441x80","price":7.64,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 10mm \/ 80PCS","offer_id":52308624507154,"sku":"GLFBLFFGLFBLFFDZ51442x80","price":8.0,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 12mm \/ 80PCS","offer_id":52308624539922,"sku":"GLFBLFFGLFBLFFDZ51443x80","price":8.7,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 14mm \/ 80PCS","offer_id":52308624572690,"sku":"GLFBLFFGLFBLFFDZ51444x80","price":9.23,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 16mm \/ 80PCS","offer_id":52308624605458,"sku":"GLFBLFFGLFBLFFDZ51445x80","price":9.59,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 18mm \/ 80PCS","offer_id":52308624638226,"sku":"GLFBLFFGLFBLFFDZ51446x80","price":10.49,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 20mm \/ 80PCS","offer_id":52308624670994,"sku":"GLFBLFFGLFBLFFDZ51447x80","price":11.49,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 25mm \/ 80PCS","offer_id":52308624703762,"sku":"GLFBLFFGLFBLFFDZ51448x80","price":12.25,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 30mm \/ 80PCS","offer_id":52308624736530,"sku":"GLFBLFFGLFBLFFDZ51449x80","price":14.42,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 10mm \/ 80PCS","offer_id":52308624769298,"sku":"GLFBLFFGLFBLFFDZ51450x80","price":16.03,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 12mm \/ 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80PCS","offer_id":52308625031442,"sku":"GLFBLFFGLFBLFFDZ51458x80","price":24.25,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 35mm \/ 80PCS","offer_id":52308625064210,"sku":"GLFBLFFGLFBLFFDZ51459x80","price":26.1,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 40mm \/ 80PCS","offer_id":52308625096978,"sku":"GLFBLFFGLFBLFFDZ51460x80","price":30.61,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 10mm \/ 80PCS","offer_id":52308625129746,"sku":"GLFBLFFGLFBLFFDZ51461x80","price":23.19,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 12mm \/ 80PCS","offer_id":52308625162514,"sku":"GLFBLFFGLFBLFFDZ51462x80","price":23.99,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 14mm \/ 80PCS","offer_id":52308625195282,"sku":"GLFBLFFGLFBLFFDZ51463x80","price":25.31,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 16mm \/ 80PCS","offer_id":52308625228050,"sku":"GLFBLFFGLFBLFFDZ51464x80","price":26.37,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/1_5_d14e409a-1d80-4db4-a3a0-b30bcda5ddb3.jpg?v=1780479517"},{"product_id":"m8-x-40mm-carriage-bolts-grade-8-8-steel-64-set","title":"M8 x 40mm Carriage Bolts Grade 8.8 Steel with Nuts and Washers — 64-Set","description":"\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose the right length for M8 carriage bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Generally, the bolt length should equal the total thickness of the materials being joined plus enough thread engagement for the nut — typically an additional 10–15mm (about 3\/8\\\"–5\/8\\\"). For example, joining two 15mm boards would typically call for a bolt at least 40mm (≈1-9\/16\\\") long. The M8x40mm in this set suits material stacks up to approximately 30mm thick.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does Grade 8.8 mean for carriage bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Grade 8.8 is a medium-high strength classification for metric steel fasteners. It indicates a minimum tensile strength of 800 MPa and a yield strength of 640 MPa, making these bolts suitable for structural and load-bearing applications in wood, metal, and composite assemblies.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can these carriage bolts be used outdoors?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These bolts are made from carbon steel with a zinc-plated or similar protective finish that provides basic corrosion resistance for covered or semi-exposed outdoor use. For fully exposed environments — such as direct rain, coastal areas, or pressure-treated lumber — stainless steel fasteners are generally recommended for long-term durability.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What thread standard do these M8 carriage bolts use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These bolts follow the standard metric coarse thread specification: M8 diameter with a 1.25mm pitch. They are compatible with any standard M8 hex nut or coupling nut. The included nuts in this set are matched to the same thread specification.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is included in the 64-set?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Each 64-set typically includes M8x40mm carriage bolts, matching M8 hex nuts, and flat washers. The exact piece count per component is listed in the variant options. All hardware in the set shares the same M8 thread specification for direct interchangeability.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the cup square dome head design and why does it matter?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A cup square (also called mushroom or dome) head features a smooth, rounded top surface with a square shank section just below the head. The square shank bites into wood to prevent the bolt from spinning during tightening — no wrench needed on the bolt head. This makes installation faster and leaves a clean, snag-free surface on the visible side of the joint.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these bolts suitable for structural deck or fence building?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. M8 Grade 8.8 carriage bolts are commonly used in deck framing, fence rail connections, pergola assembly, and similar structural wood applications. Always verify local building codes for minimum fastener requirements on load-bearing structures.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003c!-- ① OVERVIEW --\u003e\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eM8 x 40mm Carriage Bolts Grade 8.8 — Reliable Fasteners for Wood Framing \u0026amp; Structural Joints\u003c\/h2\u003e\n    \u003cp\u003eWhen a loose joint or a stripped bolt threatens your deck build, fence project, or workshop assembly, you need fasteners that hold without compromise. These M8 x 40mm carriage bolts are designed for DIYers, contractors, and woodworkers who demand consistent clamping force and a clean finished look — without spending extra time fighting a spinning bolt head.\u003c\/p\u003e\n    \u003cp\u003eEach 64-set includes M8 x 40mm Grade 8.8 carbon steel carriage bolts with a cup square dome head, paired with matching M8 hex nuts and flat washers. The M8 thread diameter measures 8mm (≈5\/16\") with a standard 1.25mm coarse pitch, and the 40mm (≈1-9\/16\") shank length suits material stacks up to approximately 30mm thick. Hardware is finished with a protective coating for general indoor and semi-exposed use.\u003c\/p\u003e\n    \u003cp\u003eTypical applications include deck rail connections, pergola and gazebo framing, fence post-to-rail joints, workbench assembly, and playground equipment repair — anywhere a flush, tamper-resistant bolt head and strong M8 carriage bolt for wood framing is required.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- ② COMPATIBILITY BAR --\u003e\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e\n    \u003cstrong\u003eThread Compatibility:\u003c\/strong\u003e Standard M8 × 1.25mm coarse thread — fits any M8 hex nut, coupling nut, or threaded insert. Square shank self-locks in wood; pre-drill a round hole equal to the bolt diameter.\n  \u003c\/div\u003e\n\n  \u003c!-- ③ KEY FEATURES --\u003e\n  \u003ch2\u003e✅ Key Features of These M8 Grade 8.8 Carriage Bolts\u003c\/h2\u003e\n  \u003cul class=\"hdiy-features\"\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🔒\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eSelf-Locking Square Shank\u003c\/strong\u003e — The square neck under the dome head bites into wood on installation, preventing rotation so you can tighten the nut with one hand and no second wrench.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e💪\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eGrade 8.8 Structural Strength\u003c\/strong\u003e — Minimum 800 MPa tensile strength handles the shear and tension loads found in deck framing, fence construction, and carriage bolt structural wood joints.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🧲\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eSmooth Dome Head Profile\u003c\/strong\u003e — The low-profile rounded head sits flush against the surface, eliminating sharp edges and giving a finished appearance on visible faces of furniture or outdoor structures.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eComplete 64-Piece Hardware Set\u003c\/strong\u003e — Bolts, nuts, and washers are included together so you can start your project immediately without sourcing matching hardware separately.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eConsistent M8 × 1.25mm Thread Pitch\u003c\/strong\u003e — Machined to standard metric coarse thread spec for reliable engagement with any M8-compatible nut, insert, or coupling across your project.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eProtective Surface Finish\u003c\/strong\u003e — A zinc-based or equivalent coating provides a barrier against surface oxidation during storage and in covered outdoor applications such as pergola bolt kits and sheltered deck assemblies.\u003c\/span\u003e\n    \u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003c!-- ④ TECHNICAL SPECIFICATIONS --\u003e\n  \u003ch2\u003e📐 Technical Specifications — M8 Carriage Bolt Set\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eMetric coarse — M8 × 1.25mm pitch\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBolt Length\u003c\/th\u003e\n\u003ctd\u003e40mm (≈1-9\/16\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Diameter\u003c\/th\u003e\n\u003ctd\u003e8mm (≈5\/16\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eCup square dome (mushroom head)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eDrive Style\u003c\/th\u003e\n\u003ctd\u003eNone — self-locking square shank (nut-side tightening only)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eStrength Grade\u003c\/th\u003e\n\u003ctd\u003eGrade 8.8 (min. tensile 800 MPa \/ yield 640 MPa)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eCarbon steel with protective surface finish\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSet Contents\u003c\/th\u003e\n\u003ctd\u003eCarriage bolts, M8 hex nuts, flat washers — see variant options for piece count\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eQuantity per Set\u003c\/th\u003e\n\u003ctd\u003e64 pieces total\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eRecommended Hole Size\u003c\/th\u003e\n\u003ctd\u003e8mm (≈5\/16\") round clearance hole in wood\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSuitable Material Thickness\u003c\/th\u003e\n\u003ctd\u003eUp to approximately 30mm (≈1-3\/16\") combined stack\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish \/ Coating\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eIndoor \/ Outdoor Use\u003c\/th\u003e\n\u003ctd\u003eIndoor and semi-exposed outdoor (covered structures)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSKU\u003c\/th\u003e\n\u003ctd\u003eXYHBRT4-331x3\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-note\"\u003e\n    \u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e\n    \u003cstrong\u003eSpec Confirmation:\u003c\/strong\u003e Finish type and exact per-component piece count vary by variant. Please confirm with us before ordering for fully exposed or coastal outdoor applications.\n  \u003c\/div\u003e\n\n  \u003c!-- ⑤ FAQ --\u003e\n  \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-faq\"\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right length for M8 carriage bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eGenerally, the bolt length should equal the total thickness of the materials being joined plus enough thread engagement for the nut — typically an additional 10–15mm (about 3\/8\"–5\/8\"). For example, joining two 15mm boards would typically call for a bolt at least 40mm (≈1-9\/16\") long. The M8x40mm in this set suits material stacks up to approximately 30mm thick.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat does Grade 8.8 mean for carriage bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eGrade 8.8 is a medium-high strength classification for metric steel fasteners. It indicates a minimum tensile strength of 800 MPa and a yield strength of 640 MPa, making these bolts suitable for structural and load-bearing applications in wood, metal, and composite assemblies.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan these carriage bolts be used outdoors?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese bolts are made from carbon steel with a protective finish that provides basic corrosion resistance for covered or semi-exposed outdoor use. For fully exposed environments — such as direct rain, coastal areas, or pressure-treated lumber — stainless steel fasteners are generally recommended for long-term durability.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat thread standard do these M8 carriage bolts use?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese bolts follow the standard metric coarse thread specification: M8 diameter with a 1.25mm pitch. They are compatible with any standard M8 hex nut or coupling nut. The included nuts in this set are matched to the same thread specification.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is included in the 64-set?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eEach 64-set typically includes M8x40mm carriage bolts, matching M8 hex nuts, and flat washers. The exact piece count per component is listed in the variant options. All hardware in the set shares the same M8 thread specification for direct interchangeability.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the cup square dome head design and why does it matter?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA cup square (also called mushroom or dome) head features a smooth, rounded top surface with a square shank section just below the head. The square shank bites into wood to prevent the bolt from spinning during tightening — no wrench needed on the bolt head. This makes installation faster and leaves a clean, snag-free surface on the visible side of the joint.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these bolts suitable for structural deck or fence building?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eYes. M8 Grade 8.8 carriage bolts are commonly used in deck framing, fence rail connections, pergola assembly, and similar structural wood applications. Always verify local building codes for minimum fastener requirements on load-bearing structures.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003c!-- ⑥ CTA BAR --\u003e\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your size and quantity above, then add to cart — ships from our US warehouse.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M8 \/ 40mm \/ 64PCS","offer_id":52308625457426,"sku":"XYHBRT4-331x3","price":81.34,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/64_-M8x40mm8.8___-_1_1.jpg?v=1780501869"},{"product_id":"cup-square-carriage-bolts-hex-nut-zinc-plated-m4-m12","title":"Cup Square Carriage Bolts with Hex Nut — Zinc Plated, M4 to M12","description":"\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose the right bolt length for my project?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Generally, add the total thickness of all materials being joined, then add enough for the hex nut and at least one thread of engagement beyond it. For example, joining two 20mm (≈3\/4\\u2033) boards typically calls for a bolt around 50mm (≈2\\u2033) long. When in doubt, size up — a slightly longer bolt is easier to trim than a short one is to replace.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What thread standard do these carriage bolts use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These bolts use standard ISO metric coarse threads (M4, M5, M6, M8, M10, M12). They are compatible with standard metric hex nuts and metric-threaded holes of the same diameter.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can these bolts be used outdoors?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The zinc plating provides moderate corrosion resistance suitable for covered outdoor structures and dry interior applications. For prolonged direct exposure to rain, salt air, or ground contact, stainless steel or hot-dip galvanized fasteners are generally recommended.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong are these carriage bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These are carbon steel bolts with zinc plating, typically meeting Grade 4.8 or equivalent tensile strength. For structural or load-bearing applications, consult your local building code and verify the grade marking on the bolt head before use.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do I need a washer with these bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A flat washer under the hex nut is generally recommended when fastening into soft materials like timber, as it distributes the clamping load and prevents the nut from pulling through. The dome head side does not require a washer — it seats flush against the surface.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How does the square neck prevent the bolt from spinning?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The square neck just below the dome head is designed to bite into timber or soft material as the nut is tightened. This locks the bolt in place so you can tighten the nut with a single wrench — no need to hold the head. In harder materials like metal, a square hole or a second wrench may be needed.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What packing quantities are available?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Depending on the size selected, kits are available in quantities of 2, 5, 10, 20, or 50 pieces per pack. Smaller sizes (M4, M5) are available in larger packs of up to 50 pieces, while larger sizes (M10, M12) come in smaller packs of 2–5 pieces.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eCup Square Carriage Bolts with Hex Nut — Zinc Plated, M4 to M12 for Timber \u0026amp; General Fastening\u003c\/h2\u003e\n    \u003cp\u003eWhether you're building a deck, assembling garden furniture, or framing a shed, loose or spinning fasteners slow every job down. These cup square carriage bolts are designed for woodworkers, contractors, and serious DIYers who need a bolt that seats cleanly, stays put while you tighten the nut, and won't rust out after the first rainy season.\u003c\/p\u003e\n    \u003cp\u003eEach kit includes matching hex nuts. Bolts are zinc-plated carbon steel with a smooth dome head and an anti-rotation square neck. Sizes range from M4 × 8mm (≈5\/16\\u2033 × 5\/16\\u2033) up to M12 × 150mm (≈1\/2\\u2033 × 5-29\/32\\u2033), available in multiple lengths. Packing quantities vary by size — from 2-piece packs for large bolts up to 50-piece packs for smaller sizes.\u003c\/p\u003e\n    \u003cp\u003eTypical applications include timber frame construction, pergola and fence assembly, playground equipment, furniture joinery, and general workshop fastening where a flush, tool-free head is needed on the face side of the workpiece.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e\n    \u003cstrong\u003eCompatibility:\u003c\/strong\u003e ISO metric coarse thread (M4–M12). Fits standard metric hex nuts of the same diameter. Square neck is designed for timber and soft materials — use a square-punched hole or backing wrench in metal applications.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-note\"\u003e\n    \u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e\n    \u003cstrong\u003eConfirm your size before ordering.\u003c\/strong\u003e Thread diameter and bolt length are listed in the variant selector above. If you need a size not shown, contact us to confirm availability.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e✅ Key Features of These Cup Square Carriage Bolts\u003c\/h2\u003e\n  \u003cul class=\"hdiy-features\"\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔵\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eDome Head Profile\u003c\/strong\u003e — The smooth, rounded dome head sits flush and snag-free on the surface, making these carriage bolts ideal for furniture and timber frame projects where a clean face finish matters.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔲\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eAnti-Rotation Square Neck\u003c\/strong\u003e — The square shank section below the head bites into timber as the nut is tightened, locking the bolt in place so you can drive the hex nut with a single wrench — no second tool needed on the head side.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eZinc-Plated Finish\u003c\/strong\u003e — Electroplated zinc coating provides corrosion resistance for covered outdoor structures, interior framing, and workshop applications where moderate moisture exposure is expected.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eWide Size Range — M4 to M12\u003c\/strong\u003e — Available in thread diameters from M4 through M12 and lengths from 8mm (≈5\/16\\u2033) to 150mm (≈5-29\/32\\u2033), covering the most common metric carriage bolt sizes for timber construction and general fastening.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eHex Nut Included\u003c\/strong\u003e — Each kit ships with matching metric hex nuts, so you have everything needed to complete the joint without a separate hardware run.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e — Choose from 2, 5, 10, 20, or 50 pieces per kit depending on your project scale, so you only buy what you need without overstocking your hardware drawer.\u003c\/span\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003e📐 Technical Specifications — Cup Square Carriage Bolts\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eCup square (dome head)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eDrive Style\u003c\/th\u003e\n\u003ctd\u003eNone — anti-rotation square neck (wrench on nut only)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eISO metric coarse (M4, M5, M6, M8, M10, M12)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Diameter Range\u003c\/th\u003e\n\u003ctd\u003eM4 (≈5\/32\\u2033) — M12 (≈15\/32\\u2033)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eLength Range\u003c\/th\u003e\n\u003ctd\u003e8mm (≈5\/16\\u2033) — 150mm (≈5-29\/32\\u2033)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eCarbon steel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish \/ Coating\u003c\/th\u003e\n\u003ctd\u003eZinc plated (electroplated)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eIncluded Hardware\u003c\/th\u003e\n\u003ctd\u003eMatching metric hex nut (1 per bolt)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePack Quantities\u003c\/th\u003e\n\u003ctd\u003e2 \/ 5 \/ 10 \/ 20 \/ 50 pcs (varies by size — see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eStrength Grade\u003c\/th\u003e\n\u003ctd\u003eSee variant options \/ Contact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-faq\"\u003e\n    \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right bolt length for my project?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eGenerally, add the total thickness of all materials being joined, then add enough for the hex nut and at least one thread of engagement beyond it. For example, joining two 20mm (≈3\/4\\u2033) boards typically calls for a bolt around 50mm (≈2\\u2033) long. When in doubt, size up — a slightly longer bolt is easier to trim than a short one is to replace.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat thread standard do these carriage bolts use?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese bolts use standard ISO metric coarse threads (M4, M5, M6, M8, M10, M12). They are compatible with standard metric hex nuts and metric-threaded holes of the same diameter.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan these bolts be used outdoors?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThe zinc plating provides moderate corrosion resistance suitable for covered outdoor structures and dry interior applications. For prolonged direct exposure to rain, salt air, or ground contact, stainless steel or hot-dip galvanized fasteners are generally recommended.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow strong are these carriage bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese are carbon steel bolts with zinc plating, typically meeting Grade 4.8 or equivalent tensile strength. For structural or load-bearing applications, consult your local building code and verify the grade marking on the bolt head before use.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDo I need a washer with these bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA flat washer under the hex nut is generally recommended when fastening into soft materials like timber, as it distributes the clamping load and prevents the nut from pulling through. The dome head side does not require a washer — it seats flush against the surface.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow does the square neck prevent the bolt from spinning?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThe square neck just below the dome head is designed to bite into timber or soft material as the nut is tightened. This locks the bolt in place so you can tighten the nut with a single wrench — no need to hold the head. In harder materials like metal, a square hole or a second wrench may be needed.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat packing quantities are available?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eDepending on the size selected, kits are available in quantities of 2, 5, 10, 20, or 50 pieces per pack. Smaller sizes (M4, M5) are available in larger packs of up to 50 pieces, while larger sizes (M10, M12) come in smaller packs of 2–5 pieces.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your size and quantity above, then add to cart — ships from our US warehouse.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M4 \/ 8mm \/ 50PCS","offer_id":52308625522962,"sku":"XYHBRT3-188x1","price":47.33,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 10mm \/ 50PCS","offer_id":52308625555730,"sku":"XYHBRT3-189x1","price":48.85,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 12mm \/ 20PCS","offer_id":52308625588498,"sku":"XYHBRT3-190x1","price":26.0,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 16mm \/ 20PCS","offer_id":52308625621266,"sku":"XYHBRT3-191x1","price":28.83,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 20mm \/ 20PCS","offer_id":52308625654034,"sku":"XYHBRT3-192x1","price":31.44,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 25mm \/ 20PCS","offer_id":52308625686802,"sku":"XYHBRT3-193x1","price":34.71,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 30mm \/ 20PCS","offer_id":52308625719570,"sku":"XYHBRT3-194x1","price":37.97,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 35mm \/ 20PCS","offer_id":52308625752338,"sku":"XYHBRT3-195x1","price":40.15,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 40mm \/ 20PCS","offer_id":52308625785106,"sku":"XYHBRT3-196x1","price":41.89,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 45mm \/ 20PCS","offer_id":52308625817874,"sku":"XYHBRT3-197x1","price":44.5,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 50mm \/ 20PCS","offer_id":52308625850642,"sku":"XYHBRT3-198x1","price":47.76,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 10mm \/ 50PCS","offer_id":52308625883410,"sku":"XYHBRT3-199x1","price":70.61,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 12mm \/ 20PCS","offer_id":52308625916178,"sku":"XYHBRT3-200x1","price":34.71,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 16mm \/ 20PCS","offer_id":52308625948946,"sku":"XYHBRT3-201x1","price":39.06,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 20mm \/ 20PCS","offer_id":52308625981714,"sku":"XYHBRT3-202x1","price":43.41,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 25mm \/ 20PCS","offer_id":52308626014482,"sku":"XYHBRT3-203x1","price":48.85,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 30mm \/ 20PCS","offer_id":52308626047250,"sku":"XYHBRT3-204x1","price":54.29,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 35mm \/ 20PCS","offer_id":52308626080018,"sku":"XYHBRT3-205x1","price":60.38,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 40mm \/ 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type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\"@type\":\"Question\",\"name\":\"How do I choose the right length for my carriage bolt?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Generally, the bolt length should equal the combined thickness of all materials being joined, plus enough thread engagement for the nut — typically at least 1× the bolt diameter beyond the last material. For example, joining two 10mm boards with an M6 bolt would typically require at least 26mm (≈1 inch) of length. Always measure your stack-up before ordering.\"}},\n    {\"@type\":\"Question\",\"name\":\"What is the tensile strength of these carriage bolts?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"These bolts are made from A2 (304) stainless steel, which typically has a tensile strength of around 500–700 MPa depending on diameter and manufacturing tolerances. For structural or load-bearing applications, please verify the specific grade requirements with an engineer.\"}},\n    {\"@type\":\"Question\",\"name\":\"Can these bolts be used outdoors or in wet environments?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. A2 stainless steel offers good corrosion resistance for most outdoor and moist environments. For marine or highly chloride-rich environments, A4 (316) stainless steel is generally recommended for longer service life.\"}},\n    {\"@type\":\"Question\",\"name\":\"What thread standard do these carriage bolts use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"These bolts use standard ISO metric coarse threads (DIN 603 \/ ISO 8677 profile). M3 through M12 sizes are compatible with standard metric nuts and washers of the same diameter designation.\"}},\n    {\"@type\":\"Question\",\"name\":\"Why choose a carriage bolt over a hex bolt for woodworking?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Carriage bolts feature a smooth domed head and a square neck that locks into wood when tightened, preventing rotation without needing a wrench on the bolt head. This makes them ideal for through-bolting timber, furniture, and decking where a clean, snag-free surface is needed.\"}},\n    {\"@type\":\"Question\",\"name\":\"Do I need a washer with these carriage bolts?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"On the nut side, using a flat washer is generally recommended to distribute clamping load and protect the material surface. On the bolt-head side, the dome head typically seats directly into the material — no washer is needed there.\"}},\n    {\"@type\":\"Question\",\"name\":\"What packing quantities are available?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Depending on the size selected, packing quantities range from 1 pc up to 100 pcs per order. Smaller sizes (M3–M4 short lengths) are available in larger packs of 50 or 100, while larger sizes (M10–M12 long lengths) are typically sold in packs of 1–5.\"}}\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003ch2\u003eBlack Stainless Steel Carriage Bolts M3–M12 — Secure, Corrosion-Resistant Fastening for Wood \u0026amp; Metal\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003cp\u003eWhether you're building a garden gate, assembling outdoor furniture, or fastening structural timber, finding a bolt that won't rust, spin, or leave an ugly exposed head is a constant challenge. These A2 black stainless steel carriage bolts are designed for DIYers, woodworkers, and contractors who need a fastener that holds firm, looks clean, and stands up to the elements.\u003c\/p\u003e\n\u003cp\u003eEach bolt features a smooth cup square dome head with a square neck shank, machined from A2 (304) stainless steel with a black finish. Sizes range from M3 × 8mm (≈5\/16\") up to M12 × 100mm (≈3-15\/16\"), with packing quantities from 1 pc to 100 pcs — so you can buy exactly what your project needs. Thread pitch follows standard ISO metric coarse specifications (DIN 603 profile).\u003c\/p\u003e\n\u003cp\u003eTypical applications include through-bolting hardwood decking and pergola beams, securing gate hinges and latch hardware to timber posts, assembling metal-to-wood brackets in workshop jigs, and fastening playground equipment where a snag-free dome head is a safety requirement. These black carriage bolts for wood fence and deck projects deliver a finished look that bare silver fasteners simply can't match.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Fits standard ISO metric nuts and washers (M3–M12). Square neck seats into softwood and hardwood. Compatible with DIN 603 \/ ISO 8677 metric coarse thread specifications.\n\u003c\/div\u003e\n\n\u003ch2\u003e✅ Key Features of These Black Stainless Steel Carriage Bolts\u003c\/h2\u003e\n\u003cul class=\"hdiy-features\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🖤\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eBlack Finish for a Clean Look\u003c\/strong\u003e — The dark finish blends with painted timber, black ironmongery, and modern outdoor structures, eliminating the visual clash of bare silver fasteners on dark wood or metal.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eA2 Stainless Steel Core\u003c\/strong\u003e — Made from 304-grade stainless steel, these bolts resist rust and surface corrosion in outdoor, humid, and mildly marine environments without sacrificing structural integrity.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔲\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eSquare Neck Anti-Rotation Design\u003c\/strong\u003e — The square shank under the dome head bites into wood grain when pulled tight, locking the bolt in place so you can tighten the nut single-handed — no wrench needed on the head side.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eWide Size Range M3–M12\u003c\/strong\u003e — Thread diameters from 3mm (≈1\/8\") to 12mm (≈1\/2\") and lengths from 8mm (≈5\/16\") to 100mm (≈3-15\/16\") cover the majority of timber and light structural fastening needs in one listing.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e — Order as few as 1 bolt for a repair job or up to 100 pcs for a full deck build. Pack sizes scale with bolt size so you're not overpaying for fasteners you won't use.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eISO Metric Coarse Thread\u003c\/strong\u003e — Standard DIN 603 thread profile ensures compatibility with off-the-shelf metric hex nuts, nylon lock nuts, and flat washers available at any hardware store.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003e📐 Technical Specifications — Black Stainless Steel Carriage Bolts\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eCarriage Bolt (Cup Square Dome Head)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eDome \/ Round (Cup Square)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDrive Style\u003c\/th\u003e\n\u003ctd\u003eNone — square neck, tightened from nut side\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eA2 Stainless Steel (304 grade)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eBlack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eISO Metric Coarse (DIN 603 \/ ISO 8677)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Diameter Range\u003c\/th\u003e\n\u003ctd\u003eM3 – M12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLength Range\u003c\/th\u003e\n\u003ctd\u003e8mm (≈5\/16\") – 100mm (≈3-15\/16\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNeck Type\u003c\/th\u003e\n\u003ctd\u003eSquare (anti-rotation)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePacking Quantity Options\u003c\/th\u003e\n\u003ctd\u003e1 \/ 2 \/ 5 \/ 10 \/ 20 \/ 50 \/ 100 pcs (varies by size)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Nut Type\u003c\/th\u003e\n\u003ctd\u003eStandard ISO metric hex nut, nylon lock nut (same diameter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRecommended Washer\u003c\/th\u003e\n\u003ctd\u003eFlat washer on nut side — see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCorrosion Resistance\u003c\/th\u003e\n\u003ctd\u003eGood — suitable for outdoor and humid environments; contact us to confirm for marine use\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-note\"\u003e\n\u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e\n\u003cstrong\u003eSize Tip:\u003c\/strong\u003e Measure the total thickness of all materials being joined and add at least 1× the bolt diameter for nut thread engagement. Contact us to confirm if you need a specific torque rating or load specification.\n\u003c\/div\u003e\n\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right length for my carriage bolt?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eGenerally, the bolt length should equal the combined thickness of all materials being joined, plus enough thread engagement for the nut — typically at least 1× the bolt diameter beyond the last material. For example, joining two 10mm boards with an M6 bolt would typically require at least 26mm (≈1\") of length. If in doubt, size up — a slightly longer bolt can be accommodated with an extra washer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the tensile strength of these carriage bolts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese bolts are made from A2 (304) stainless steel, which typically has a tensile strength of around 500–700 MPa depending on diameter and manufacturing tolerances. For structural or load-bearing applications, please verify the specific grade requirements with a qualified engineer before specifying these fasteners.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan these bolts be used outdoors or in wet environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. A2 stainless steel offers good corrosion resistance for most outdoor, garden, and moist environments — including decking, fencing, and pergola construction. For coastal or marine environments with high chloride exposure, A4 (316) stainless steel is generally recommended for longer service life. Contact us if you need marine-grade confirmation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat thread standard do these carriage bolts use — are they compatible with standard metric nuts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. These bolts use standard ISO metric coarse threads conforming to the DIN 603 \/ ISO 8677 profile. M3 through M12 sizes are fully compatible with standard metric hex nuts, nylon lock nuts, and flat washers of the same diameter designation available at any hardware store in the US and internationally.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhy choose a carriage bolt over a hex bolt for woodworking projects?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eCarriage bolts feature a smooth domed head and a square neck that locks into wood grain when tightened, preventing rotation without needing a wrench on the bolt head. This makes them ideal for through-bolting timber, furniture, and decking where a clean, snag-free surface is needed — particularly where the bolt head is on a visible or touch-accessible face.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eDo I need a washer with these carriage bolts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eOn the nut side, using a flat washer is generally recommended to distribute clamping load and protect the material surface from the nut bearing face. On the bolt-head side, the dome head typically seats directly into the material — no washer is needed there. For softer woods, a washer under the dome head can help prevent pull-through under heavy load.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat packing quantities are available, and how do I pick the right one?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eDepending on the size selected, packing quantities range from 1 pc up to 100 pcs per order. Smaller sizes (M3–M4 in short lengths) are available in larger packs of 50 or 100, while larger sizes (M10–M12 in longer lengths) are typically sold in packs of 1–5. For a deck or fence project, count your bolt positions and add 10% for spares. For a repair job, a single-piece pack keeps costs low.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-cta\"\u003e\n🛒 Select your size and packing quantity above, then add to cart — ships from our US warehouse.\n\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M3 \/ 8mm \/ 50PCS","offer_id":52308629684498,"sku":"XYHBRT4-288x1","price":7.86,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 10mm \/ 50PCS","offer_id":52308629717266,"sku":"XYHBRT4-289x1","price":8.4,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 12mm \/ 50PCS","offer_id":52308629750034,"sku":"XYHBRT4-290x1","price":9.93,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 16mm \/ 20PCS","offer_id":52308629782802,"sku":"XYHBRT4-291x1","price":6.5,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 20mm \/ 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10PCS","offer_id":52308630274322,"sku":"XYHBRT4-306x1","price":8.95,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 25mm \/ 10PCS","offer_id":52308630307090,"sku":"XYHBRT4-307x1","price":10.04,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 30mm \/ 5PCS","offer_id":52308630339858,"sku":"XYHBRT4-308x1","price":6.5,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 35mm \/ 5PCS","offer_id":52308630372626,"sku":"XYHBRT4-309x1","price":7.59,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 40mm \/ 5PCS","offer_id":52308630405394,"sku":"XYHBRT4-310x1","price":8.4,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 45mm \/ 5PCS","offer_id":52308630438162,"sku":"XYHBRT4-311x1","price":8.95,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 50mm \/ 5PCS","offer_id":52308630470930,"sku":"XYHBRT4-312x1","price":9.66,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 12mm \/ 5PCS","offer_id":52308630503698,"sku":"XYHBRT4-313x1","price":7.75,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 16mm \/ 5PCS","offer_id":52308630536466,"sku":"XYHBRT4-314x1","price":6.77,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 20mm \/ 5PCS","offer_id":52308630569234,"sku":"XYHBRT4-315x1","price":7.32,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 25mm \/ 5PCS","offer_id":52308630602002,"sku":"XYHBRT4-316x1","price":8.02,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 30mm \/ 5PCS","offer_id":52308630634770,"sku":"XYHBRT4-317x1","price":8.84,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 35mm \/ 5PCS","offer_id":52308630667538,"sku":"XYHBRT4-318x1","price":9.49,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 40mm \/ 5PCS","offer_id":52308630700306,"sku":"XYHBRT4-319x1","price":10.47,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 45mm \/ 5PCS","offer_id":52308630733074,"sku":"XYHBRT4-320x1","price":11.29,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 50mm \/ 5PCS","offer_id":52308630765842,"sku":"XYHBRT4-321x1","price":12.1,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 60mm \/ 2PCS","offer_id":52308630798610,"sku":"XYHBRT4-322x1","price":6.77,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 70mm \/ 2PCS","offer_id":52308630831378,"sku":"XYHBRT4-323x1","price":7.32,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 80mm \/ 2PCS","offer_id":52308630864146,"sku":"XYHBRT4-324x1","price":7.86,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 12mm \/ 2PCS","offer_id":52308630896914,"sku":"XYHBRT4-325x1","price":8.02,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 16mm \/ 2PCS","offer_id":52308630929682,"sku":"XYHBRT4-326x1","price":6.39,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 20mm \/ 2PCS","offer_id":52308630962450,"sku":"XYHBRT4-327x1","price":6.5,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 25mm \/ 2PCS","offer_id":52308630995218,"sku":"XYHBRT4-328x1","price":6.77,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 30mm \/ 2PCS","offer_id":52308631027986,"sku":"XYHBRT4-329x1","price":7.32,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 35mm \/ 2PCS","offer_id":52308631060754,"sku":"XYHBRT4-330x1","price":7.86,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 40mm \/ 2PCS","offer_id":52308631093522,"sku":"XYHBRT4-331x1","price":8.57,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 45mm \/ 2PCS","offer_id":52308631126290,"sku":"XYHBRT4-332x1","price":9.22,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 50mm \/ 2PCS","offer_id":52308631159058,"sku":"XYHBRT4-333x1","price":9.76,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 60mm \/ 1PCS","offer_id":52308631191826,"sku":"XYHBRT4-334x1","price":6.5,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 70mm \/ 1PCS","offer_id":52308631224594,"sku":"XYHBRT4-335x1","price":6.94,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 80mm \/ 1PCS","offer_id":52308631257362,"sku":"XYHBRT4-336x1","price":7.32,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 90mm \/ 1PCS","offer_id":52308631290130,"sku":"XYHBRT4-337x1","price":7.75,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 100mm \/ 1PCS","offer_id":52308631322898,"sku":"XYHBRT4-338x1","price":8.13,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 16mm \/ 1PCS","offer_id":52308631355666,"sku":"XYHBRT4-339x1","price":7.21,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 20mm \/ 1PCS","offer_id":52308631388434,"sku":"XYHBRT4-340x1","price":6.23,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 25mm \/ 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5PCS","offer_id":52308634632466,"sku":"XYHBRT4-363x5","price":79.67,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-02_952759d3-0f04-4ea0-a997-f841043940c6.jpg?v=1780639171"},{"product_id":"m4-m12-zinc-plated-cup-square-carriage-bolts-flange-nuts","title":"M4–M12 Zinc-Plated Cup Square Carriage Bolts with Flange Nuts | 8–150mm","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eZinc-Plated Carriage Bolts M4–M12 — One Listing, Every Size You Need\u003c\/h2\u003e\n\u003cp\u003eWhether you're building a deck, assembling outdoor furniture, framing a pergola, or tackling a workshop project, hunting down the right fastener in the right length wastes time and delays your build. These zinc-plated cup square carriage bolts cover M4 through M12 diameters and lengths from 8mm (5\/16\") to 150mm (≈5-29\/32\"), so you can source everything from a single, reliable listing.\u003c\/p\u003e\n\u003cp\u003eEach bolt features a smooth domed head and a square shank section that locks into wood or a pre-drilled square hole, preventing rotation while you tighten from the nut side. The zinc electroplating provides a uniform corrosion-resistant coating across the full shank and head. Matching M4–M12 flange nuts are available in the same listing — the integrated flange acts as a built-in washer, spreading clamping load and reducing surface damage on softer materials. Sizes span M4 × 8mm through M12 × 150mm, with packing quantities from 2 to 200 pieces per order.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include timber deck construction with M8–M12 bolts through joists and posts, flat-pack furniture assembly and repair using M4–M6 bolts in pre-drilled knockdown fittings, and DIY playground or swing-set builds where a tamper-resistant smooth head is required for child safety. The metric coarse thread profile also makes these a go-to replacement fastener for machinery guards, equipment enclosures, and light structural brackets.\u003c\/p\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eThread Standard:\u003c\/strong\u003e Metric coarse thread (ISO 68-1 \/ DIN 603) — compatible with all standard metric hex nuts and flange nuts of the matching diameter.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-note\"\u003e\n\u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e \u003cstrong\u003eConfirm your length before ordering.\u003c\/strong\u003e Measure total material stack thickness and add at least one full nut height. If your exact length is not listed, please contact us to confirm availability.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These Zinc-Plated Carriage Bolts\u003c\/h2\u003e\n\u003cul class=\"hdiy-features\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔒\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eAnti-Rotation Square Shank\u003c\/strong\u003e — The square neck section below the domed head bites into timber or a matching square hole, keeping the bolt stationary while you torque the nut from one side — no second wrench needed.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eZinc Electroplated Finish\u003c\/strong\u003e — A uniform zinc coating across the full bolt body resists surface oxidation in indoor and sheltered outdoor environments, extending service life compared to bare steel fasteners.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eWide Size Range in One Listing\u003c\/strong\u003e — M4 through M12 diameters and 8mm to 150mm lengths let you match the exact fastener to your material stack without ordering from multiple suppliers.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eMatching Flange Nuts Included as Variants\u003c\/strong\u003e — M4–M12 flange nuts with an integrated load-spreading flange are available in the same listing, eliminating the need for separate flat washers on most wood and metal applications.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e — Choose from 2, 5, 10, 20, 50, 100, or 200 pieces per order depending on your project scale — from a single repair job to a full deck build.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏗️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eDIN 603 Cup Square Head Profile\u003c\/strong\u003e — The low-profile domed head sits flush and smooth on the surface, making these carriage bolts suitable for child-safe playground equipment, furniture, and any application where a protruding hex head is undesirable.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e📐 Technical Specifications — Cup Square Carriage Bolts \u0026amp; Flange Nuts\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eCup Square Carriage Bolt (Coach Bolt) + Flange Nut\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eDomed \/ Cup Square (DIN 603)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDrive Style\u003c\/th\u003e\n\u003ctd\u003eNo drive — anti-rotation square shank (nut-side tightening only)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eMetric Coarse (ISO 68-1)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Diameters\u003c\/th\u003e\n\u003ctd\u003eM4, M5, M6, M8, M10, M12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e8mm (5\/16\") – 150mm (≈5-29\/32\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Pitch\u003c\/th\u003e\n\u003ctd\u003eM4: 0.7mm | M5: 0.8mm | M6: 1.0mm | M8: 1.25mm | M10: 1.5mm | M12: 1.75mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eCarbon steel with zinc electroplating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish \/ Coating\u003c\/th\u003e\n\u003ctd\u003eZinc-plated (electroplated)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFlange Nut Compatibility\u003c\/th\u003e\n\u003ctd\u003eM4, M5, M6, M8, M10, M12 — metric coarse thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePacking Quantity\u003c\/th\u003e\n\u003ctd\u003e2 \/ 5 \/ 10 \/ 20 \/ 50 \/ 100 \/ 200 pcs (varies by size — see variant selector)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eProperty Class\u003c\/th\u003e\n\u003ctd\u003eSee variant options (contact us to confirm for load-critical applications)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCorrosion Resistance\u003c\/th\u003e\n\u003ctd\u003eModerate — suitable for indoor and sheltered outdoor use\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right bolt length for my project?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eGenerally, add the total thickness of all materials being joined, then add at least one full nut height plus a few thread pitches for secure engagement. For example, joining two 10mm (3\/8\") boards with an M6 bolt typically requires a length of 25–30mm (1\"–1-3\/16\"). When in doubt, size up — a bolt that's slightly too long can be managed with an extra nut or washer, but one that's too short won't clamp properly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the tensile strength of these carriage bolts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese bolts are typically manufactured to property class 4.8 or 8.8, which generally provides tensile strengths of approximately 400–800 MPa depending on the grade. For load-critical or structural applications, please contact us to confirm the exact property class before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these bolts suitable for outdoor or wet environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe zinc electroplating provides moderate corrosion resistance, making these bolts well-suited for indoor use and sheltered outdoor applications such as covered decks, pergolas, and carports. For prolonged direct exposure to rain, salt spray, or standing water, a stainless steel or hot-dip galvanized fastener is generally recommended. Applying a zinc-compatible thread sealant or anti-corrosion compound can extend service life in damp conditions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat thread standard do these bolts use, and are they compatible with standard nuts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese bolts follow the metric coarse thread standard (ISO 68-1 \/ DIN 603). Standard pitches are: M4 = 0.7mm, M5 = 0.8mm, M6 = 1.0mm, M8 = 1.25mm, M10 = 1.5mm, M12 = 1.75mm. They are fully compatible with any standard metric coarse hex nut or flange nut of the matching diameter, including the flange nuts available as variants in this listing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between a carriage bolt and a regular hex bolt?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA carriage bolt (also called a coach bolt) has a smooth, domed head and a square shank section directly below the head. When inserted into wood or a square-punched hole, the square shank locks the bolt in place so it cannot rotate — allowing you to tighten the nut from one side only with a single wrench. A standard hex bolt has a hex head that requires a wrench on both ends. The smooth dome head of a carriage bolt also eliminates sharp edges, making it safer for furniture and playground equipment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use the flange nuts with other metric bolts I already have?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. The M4, M5, M6, M8, M10, and M12 flange nuts use standard metric coarse threads and are compatible with any metric bolt of the matching diameter and coarse pitch. The integrated flange distributes clamping load over a wider bearing area, reducing the need for a separate flat washer and helping prevent pull-through on softer materials like wood or thin sheet metal.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow many pieces are included per order?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003ePacking quantity varies by size and is displayed in the \u003cstrong\u003ePacking Quantity (Pcs)\u003c\/strong\u003e variant selector. Options include 2, 5, 10, 20, 50, 100, and 200 pieces depending on the bolt diameter and length selected. Flange nuts are sold in packs of 10–200 pieces. Select your preferred quantity before adding to cart.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your \u003cstrong\u003esize and length\u003c\/strong\u003e above, then add to cart — ships from our US warehouse.\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M4 \/ 8 mm \/ 100PCS","offer_id":52308634894610,"sku":"XYHGY-VKA2603-045-001x1","price":12.63,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 10 mm \/ 100PCS","offer_id":52308634927378,"sku":"XYHGY-VKA2603-045-002x1","price":15.49,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 12 mm \/ 50PCS","offer_id":52308634960146,"sku":"XYHGY-VKA2603-045-003x1","price":10.19,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 16 mm \/ 50PCS","offer_id":52308634992914,"sku":"XYHGY-VKA2603-045-004x1","price":12.09,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 20 mm \/ 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35 mm \/ 50PCS","offer_id":52308635484434,"sku":"XYHGY-VKA2603-045-019x1","price":31.13,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 40 mm \/ 50PCS","offer_id":52308635517202,"sku":"XYHGY-VKA2603-045-020x1","price":35.07,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 45 mm \/ 50PCS","offer_id":52308635549970,"sku":"XYHGY-VKA2603-045-021x1","price":38.88,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 50 mm \/ 50PCS","offer_id":52308635582738,"sku":"XYHGY-VKA2603-045-022x1","price":42.64,"currency_code":"USD","in_stock":true},{"title":"M5 \/ Flange Nut \/ 100PCS","offer_id":52308635615506,"sku":"XYHGY-VKA2603-045-023x1","price":12.36,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 10 mm \/ 100PCS","offer_id":52308635648274,"sku":"XYHGY-VKA2603-045-024x1","price":27.68,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 12 mm \/ 50PCS","offer_id":52308635681042,"sku":"XYHGY-VKA2603-045-025x1","price":17.26,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 14 mm \/ 50PCS","offer_id":52308635713810,"sku":"XYHGY-VKA2603-045-026x1","price":19.52,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 16 mm \/ 50PCS","offer_id":52308635746578,"sku":"XYHGY-VKA2603-045-027x1","price":21.75,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 20 mm \/ 50PCS","offer_id":52308635779346,"sku":"XYHGY-VKA2603-045-028x1","price":26.1,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 25 mm \/ 50PCS","offer_id":52308635812114,"sku":"XYHGY-VKA2603-045-029x1","price":31.67,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 30 mm \/ 50PCS","offer_id":52308635844882,"sku":"XYHGY-VKA2603-045-030x1","price":37.25,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 35 mm \/ 50PCS","offer_id":52308635877650,"sku":"XYHGY-VKA2603-045-031x1","price":42.77,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 40 mm \/ 50PCS","offer_id":52308635910418,"sku":"XYHGY-VKA2603-045-032x1","price":56.51,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 45 mm \/ 50PCS","offer_id":52308635943186,"sku":"XYHGY-VKA2603-045-033x1","price":63.23,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 50 mm \/ 50PCS","offer_id":52308635975954,"sku":"XYHGY-VKA2603-045-034x1","price":69.89,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 55 mm \/ 20PCS","offer_id":52308636008722,"sku":"XYHGY-VKA2603-045-035x1","price":27.81,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 60 mm \/ 20PCS","offer_id":52308636041490,"sku":"XYHGY-VKA2603-045-036x1","price":29.91,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 65 mm \/ 20PCS","offer_id":52308636074258,"sku":"XYHGY-VKA2603-045-037x1","price":32.35,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 70 mm \/ 20PCS","offer_id":52308636107026,"sku":"XYHGY-VKA2603-045-038x1","price":34.61,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 75 mm \/ 20PCS","offer_id":52308636139794,"sku":"XYHGY-VKA2603-045-039x1","price":37.25,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 80 mm \/ 20PCS","offer_id":52308636172562,"sku":"XYHGY-VKA2603-045-040x1","price":39.7,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 90 mm \/ 20PCS","offer_id":52308636205330,"sku":"XYHGY-VKA2603-045-041x1","price":44.05,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 100 mm \/ 10PCS","offer_id":52308636238098,"sku":"XYHGY-VKA2603-045-042x1","price":25.42,"currency_code":"USD","in_stock":true},{"title":"M6 \/ Flange Nut \/ 50PCS","offer_id":52308636270866,"sku":"XYHGY-VKA2603-045-043x1","price":9.23,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 12 mm \/ 50PCS","offer_id":52308636303634,"sku":"XYHGY-VKA2603-045-044x1","price":27.81,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 16 mm \/ 50PCS","offer_id":52308636336402,"sku":"XYHGY-VKA2603-045-045x1","price":36.79,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 20 mm \/ 50PCS","offer_id":52308636369170,"sku":"XYHGY-VKA2603-045-046x1","price":44.73,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 25 mm \/ 20PCS","offer_id":52308636401938,"sku":"XYHGY-VKA2603-045-047x1","price":23.32,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 30 mm \/ 20PCS","offer_id":52308636434706,"sku":"XYHGY-VKA2603-045-048x1","price":27.05,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 35 mm \/ 20PCS","offer_id":52308636467474,"sku":"XYHGY-VKA2603-045-049x1","price":30.99,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 40 mm \/ 20PCS","offer_id":52308636500242,"sku":"XYHGY-VKA2603-045-050x1","price":35.02,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 45 mm \/ 20PCS","offer_id":52308636533010,"sku":"XYHGY-VKA2603-045-051x1","price":38.88,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 50 mm \/ 20PCS","offer_id":52308636565778,"sku":"XYHGY-VKA2603-045-052x1","price":42.96,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 55 mm \/ 20PCS","offer_id":52308636598546,"sku":"XYHGY-VKA2603-045-053x1","price":46.85,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 60 mm \/ 20PCS","offer_id":52308636631314,"sku":"XYHGY-VKA2603-045-054x1","price":59.55,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 65 mm \/ 10PCS","offer_id":52308636664082,"sku":"XYHGY-VKA2603-045-055x1","price":28.68,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 70 mm \/ 10PCS","offer_id":52308636696850,"sku":"XYHGY-VKA2603-045-056x1","price":30.8,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 75 mm \/ 10PCS","offer_id":52308636729618,"sku":"XYHGY-VKA2603-045-057x1","price":32.9,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 80 mm \/ 10PCS","offer_id":52308636762386,"sku":"XYHGY-VKA2603-045-058x1","price":35.07,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 90 mm \/ 10PCS","offer_id":52308636795154,"sku":"XYHGY-VKA2603-045-059x1","price":38.88,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 100 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\/ 20 mm \/ 20PCS","offer_id":52308637057298,"sku":"XYHGY-VKA2603-045-067x1","price":29.44,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 25 mm \/ 20PCS","offer_id":52308637090066,"sku":"XYHGY-VKA2603-045-068x1","price":35.48,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 30 mm \/ 10PCS","offer_id":52308637122834,"sku":"XYHGY-VKA2603-045-069x1","price":22.02,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 35 mm \/ 10PCS","offer_id":52308637155602,"sku":"XYHGY-VKA2603-045-070x1","price":25.15,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 40 mm \/ 10PCS","offer_id":52308637188370,"sku":"XYHGY-VKA2603-045-071x1","price":28.27,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 45 mm \/ 10PCS","offer_id":52308637221138,"sku":"XYHGY-VKA2603-045-072x1","price":31.35,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 50 mm \/ 10PCS","offer_id":52308637253906,"sku":"XYHGY-VKA2603-045-073x1","price":34.53,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 55 mm \/ 10PCS","offer_id":52308637286674,"sku":"XYHGY-VKA2603-045-074x1","price":37.74,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 60 mm \/ 10PCS","offer_id":52308637319442,"sku":"XYHGY-VKA2603-045-075x1","price":40.87,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 65 mm \/ 10PCS","offer_id":52308637352210,"sku":"XYHGY-VKA2603-045-076x1","price":44.0,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 70 mm \/ 10PCS","offer_id":52308637384978,"sku":"XYHGY-VKA2603-045-077x1","price":47.12,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 75 mm \/ 5PCS","offer_id":52308637417746,"sku":"XYHGY-VKA2603-045-078x1","price":26.23,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 80 mm \/ 5PCS","offer_id":52308637450514,"sku":"XYHGY-VKA2603-045-079x1","price":27.73,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 90 mm \/ 5PCS","offer_id":52308637483282,"sku":"XYHGY-VKA2603-045-080x1","price":30.94,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 100 mm \/ 5PCS","offer_id":52308637516050,"sku":"XYHGY-VKA2603-045-081x1","price":34.2,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 110 mm \/ 5PCS","offer_id":52308637548818,"sku":"XYHGY-VKA2603-045-082x1","price":37.33,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 120 mm \/ 5PCS","offer_id":52308637581586,"sku":"XYHGY-VKA2603-045-083x1","price":40.46,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 130 mm \/ 5PCS","offer_id":52308637614354,"sku":"XYHGY-VKA2603-045-084x1","price":43.51,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 140 mm \/ 5PCS","offer_id":52308637647122,"sku":"XYHGY-VKA2603-045-085x1","price":46.58,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 150 mm \/ 5PCS","offer_id":52308637679890,"sku":"XYHGY-VKA2603-045-086x1","price":58.33,"currency_code":"USD","in_stock":true},{"title":"M10 \/ Flange Nut \/ 20PCS","offer_id":52308637712658,"sku":"XYHGY-VKA2603-045-087x1","price":9.78,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 25 mm \/ 10PCS","offer_id":52308637745426,"sku":"XYHGY-VKA2603-045-088x1","price":26.51,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 30 mm \/ 10PCS","offer_id":52308637778194,"sku":"XYHGY-VKA2603-045-089x1","price":31.08,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 35 mm \/ 10PCS","offer_id":52308637810962,"sku":"XYHGY-VKA2603-045-090x1","price":35.48,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 40 mm \/ 10PCS","offer_id":52308637843730,"sku":"XYHGY-VKA2603-045-091x1","price":39.97,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 45 mm \/ 5PCS","offer_id":52308637876498,"sku":"XYHGY-VKA2603-045-092x1","price":23.32,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 50 mm \/ 5PCS","offer_id":52308637909266,"sku":"XYHGY-VKA2603-045-093x1","price":25.5,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 55 mm \/ 5PCS","offer_id":52308637942034,"sku":"XYHGY-VKA2603-045-094x1","price":27.81,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 60 mm \/ 5PCS","offer_id":52308637974802,"sku":"XYHGY-VKA2603-045-095x1","price":30.12,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 70 mm \/ 5PCS","offer_id":52308638007570,"sku":"XYHGY-VKA2603-045-096x1","price":34.39,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 75 mm \/ 5PCS","offer_id":52308638040338,"sku":"XYHGY-VKA2603-045-097x1","price":36.79,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 80 mm \/ 5PCS","offer_id":52308638073106,"sku":"XYHGY-VKA2603-045-098x1","price":39.24,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 90 mm \/ 5PCS","offer_id":52308638105874,"sku":"XYHGY-VKA2603-045-099x1","price":43.78,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 100 mm \/ 5PCS","offer_id":52308638138642,"sku":"XYHGY-VKA2603-045-100x1","price":56.97,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 110 mm \/ 5PCS","offer_id":52308638171410,"sku":"XYHGY-VKA2603-045-101x1","price":62.27,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 120 mm \/ 2PCS","offer_id":52308638204178,"sku":"XYHGY-VKA2603-045-102x1","price":25.15,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 130 mm \/ 2PCS","offer_id":52308638236946,"sku":"XYHGY-VKA2603-045-103x1","price":27.05,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 140 mm \/ 2PCS","offer_id":52308638269714,"sku":"XYHGY-VKA2603-045-104x1","price":29.23,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 150 mm \/ 2PCS","offer_id":52308638302482,"sku":"XYHGY-VKA2603-045-105x1","price":31.21,"currency_code":"USD","in_stock":true},{"title":"M12 \/ Flange Nut \/ 10PCS","offer_id":52308638335250,"sku":"XYHGY-VKA2603-045-106x1","price":9.23,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-03_c94c267b-355e-401b-931e-38b5c837879d.jpg?v=1780639495"},{"product_id":"m4-m12-cup-square-carriage-bolts-hex-nuts-zinc","title":"M4–M12 Cup Square Carriage Bolts with Hex Full Nuts | Zinc Plated | Sets of 2–50","description":"\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose the right bolt length for my project?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Generally, the bolt length should equal the total thickness of all materials being joined, plus enough thread engagement for the nut — typically at least 1× the bolt diameter beyond the last material layer. For example, joining two 10mm boards with an M6 bolt would typically require at least 26mm (20mm material + 6mm thread). When in doubt, size up by one increment.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the load-bearing or shear strength of these carriage bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Zinc-plated carriage bolts are generally manufactured to a Grade 4.8 or equivalent standard, which typically provides a tensile strength of around 400 MPa. Actual load capacity depends on bolt diameter, material thickness, and joint design. For structural or load-critical applications, please confirm the grade with us before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these bolts suitable for outdoor or wet environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The zinc electroplating provides moderate corrosion resistance suitable for indoor use and occasional moisture exposure. For prolonged outdoor exposure, high humidity, or direct contact with treated lumber, a hot-dip galvanized or stainless steel fastener is generally recommended. Contact us to confirm suitability for your specific environment.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What thread standard do these carriage bolts use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These bolts use standard ISO metric coarse thread (M4 through M12). The included hex nuts are matched to the same metric coarse pitch, so no additional hardware is needed for a complete fastening assembly.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does the square shoulder under the head do?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The cup square (also called a carriage bolt) design features a smooth domed head and a square shank section directly beneath it. When driven into wood or a square-punched hole, the square shoulder bites into the material and prevents the bolt from spinning while you tighten the nut — no wrench needed on the bolt head.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many pieces come in each set, and can I buy a single size?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Each listing is sold as a set that includes both the carriage bolts and matching hex full nuts. Pack quantities vary by size: smaller diameters (M4–M5) are available in sets of 20 or 50, while larger diameters (M8–M12) come in sets of 2, 5, or 10. Select your preferred size and quantity combination from the variant options above.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these bolts with metal, not just wood?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Carriage bolts are most commonly used with wood, but they can also be used with metal if the receiving hole is square-punched or if a backing plate is used to prevent rotation. For metal-to-metal applications without a square hole, a standard hex bolt is generally a better choice.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eZinc-Plated Carriage Bolts with Hex Nuts — Secure, Spin-Free Fastening for Wood \u0026amp; DIY Assemblies\u003c\/h2\u003e\n    \u003cp\u003eIf you've ever struggled to hold a bolt still while tightening a nut on the other side — especially in tight spaces or overhead — you know how frustrating a standard hex bolt can be. These M4–M12 cup square carriage bolts solve that problem with a self-locking square shoulder that grips the material and keeps the bolt from rotating, so one person can do the job of two.\u003c\/p\u003e\n    \u003cp\u003eEach set includes both the carriage bolts and matching hexagon full nuts, ready to use straight out of the bag. Available in metric thread sizes M4, M5, M6, M8, M10, and M12, with lengths ranging from 8mm (≈5\/16\") to 150mm (≈5-29\/32\"), and pack quantities of 2, 5, 10, 20, or 50 pieces per set depending on the size selected. The zinc electroplating provides a clean silver finish and baseline corrosion resistance for general-purpose use.\u003c\/p\u003e\n    \u003cp\u003eTypical applications include timber frame construction and deck building where carriage bolts through-fasten structural members, furniture assembly and workbench builds where a flush dome head is preferred over a protruding hex head, and DIY gate hardware, fence rails, and playground equipment where a smooth exterior surface reduces snag hazards.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e\n    \u003cstrong\u003eCompatibility:\u003c\/strong\u003e ISO metric coarse thread (M4–M12). Hex full nuts included and pre-matched to bolt thread. Fits standard metric square-punched holes or wood applications. Not compatible with UNC\/UNF inch-thread hardware.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e✅ Key Features of These Zinc-Plated Carriage Bolts with Hex Nuts\u003c\/h2\u003e\n  \u003cul class=\"hdiy-features\"\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔒\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eSelf-Locking Square Shoulder\u003c\/strong\u003e — The cup square shank section beneath the dome head bites into wood or a square-punched hole, preventing bolt rotation while you tighten the nut — no second wrench or helper needed.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🪙\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eZinc Electroplated Finish\u003c\/strong\u003e — A uniform zinc coating provides baseline corrosion resistance and a clean appearance for indoor and sheltered outdoor fastening applications.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eWide Size Range in One Listing\u003c\/strong\u003e — Covers M4 through M12 thread diameters and lengths from 8mm (≈5\/16\") to 150mm (≈5-29\/32\"), making it easy to source multiple sizes for a single project without multiple orders.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eComplete Bolt-and-Nut Sets\u003c\/strong\u003e — Every pack includes matching hexagon full nuts, so you have everything needed for a through-bolt assembly without hunting for compatible hardware separately.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🪵\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eSmooth Dome Head Design\u003c\/strong\u003e — The rounded head sits flush and snag-free on the surface, making these carriage bolts well-suited for furniture, playground equipment, and any application where exposed fastener heads could cause injury or snagging.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e — Available in sets of 2, 5, 10, 20, or 50 depending on the size, so you can buy exactly what a repair job needs or stock up for larger timber framing and deck fastening projects.\u003c\/span\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003e📐 Technical Specifications — Cup Square Carriage Bolts with Hex Nuts\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eCup Square Carriage Bolt with Hexagon Full Nut\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eISO Metric Coarse (M4, M5, M6, M8, M10, M12)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e8mm (≈5\/16\") – 150mm (≈5-29\/32\"); see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eDome (round\/cup) head with square anti-rotation shank\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eIncluded Hardware\u003c\/th\u003e\n\u003ctd\u003eCarriage bolts + matching hexagon full nuts (per set)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eCarbon steel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eZinc electroplated\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e2 \/ 5 \/ 10 \/ 20 \/ 50 pcs per set (varies by size — see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eDrive Style\u003c\/th\u003e\n\u003ctd\u003eNo drive required on bolt head (nut-side tightening only)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eGrade \/ Strength Class\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-note\"\u003e\n    \u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e\n    \u003cstrong\u003eNote:\u003c\/strong\u003e Zinc-plated fasteners are suitable for general indoor use and sheltered applications. For prolonged outdoor exposure, pressure-treated lumber, or marine environments, consider hot-dip galvanized or stainless steel alternatives. Contact us if you need confirmation on grade or finish suitability.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-faq\"\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right bolt length for my project?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eGenerally, the bolt length should equal the total thickness of all materials being joined, plus enough thread engagement for the nut — typically at least 1× the bolt diameter beyond the last material layer. For example, joining two 10mm boards with an M6 bolt would typically require at least 26mm (20mm material + 6mm thread). When in doubt, size up by one increment.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the load-bearing or shear strength of these carriage bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eZinc-plated carriage bolts are generally manufactured to a Grade 4.8 or equivalent standard, which typically provides a tensile strength of around 400 MPa. Actual load capacity depends on bolt diameter, material thickness, and joint design. For structural or load-critical applications, please confirm the grade with us before ordering.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these bolts suitable for outdoor or wet environments?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThe zinc electroplating provides moderate corrosion resistance suitable for indoor use and occasional moisture exposure. For prolonged outdoor exposure, high humidity, or direct contact with treated lumber, a hot-dip galvanized or stainless steel fastener is generally recommended. Contact us to confirm suitability for your specific environment.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat thread standard do these carriage bolts use — are they compatible with my existing nuts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese bolts use standard ISO metric coarse thread (M4 through M12). The included hex nuts are matched to the same metric coarse pitch, so no additional hardware is needed for a complete fastening assembly. They are \u003cstrong\u003enot\u003c\/strong\u003e compatible with UNC or UNF inch-thread hardware.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat does the square shoulder under the head do, and do I need a wrench on the bolt?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThe cup square (carriage bolt) design features a smooth domed head and a square shank section directly beneath it. When driven into wood or a square-punched hole, the square shoulder bites into the material and prevents the bolt from spinning while you tighten the nut — no wrench needed on the bolt head side.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow many pieces come in each set, and do the nuts come included?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eEach listing is sold as a complete set that includes both the carriage bolts and matching hex full nuts. Pack quantities vary by size: smaller diameters (M4–M5) are available in sets of 20 or 50, while larger diameters (M8–M12) come in sets of 2, 5, or 10. Select your preferred size and quantity combination from the variant options above.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use these carriage bolts with metal, not just wood?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eCarriage bolts are most commonly used with wood, but they can also be used with metal if the receiving hole is square-punched or if a backing plate is used to prevent rotation. For metal-to-metal applications without a square hole, a standard hex bolt is generally a better choice. Contact us if you are unsure which fastener type suits your application.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your size and quantity above, then add to cart — ships from our US warehouse.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M4 \/ 8 mm \/ 50PCS","offer_id":52308639482130,"sku":"XYHGY-VKA2603-048-001x1","price":9.04,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 10 mm \/ 50PCS","offer_id":52308639514898,"sku":"XYHGY-VKA2603-048-002x1","price":10.4,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 12 mm \/ 20PCS","offer_id":52308639547666,"sku":"XYHGY-VKA2603-048-003x1","price":7.47,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 16 mm \/ 20PCS","offer_id":52308639580434,"sku":"XYHGY-VKA2603-048-004x1","price":7.47,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 20 mm \/ 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110 mm \/ 2PCS","offer_id":52308642595090,"sku":"XYHGY-VKA2603-048-096x1","price":23.24,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 120 mm \/ 2PCS","offer_id":52308642627858,"sku":"XYHGY-VKA2603-048-097x1","price":25.01,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 130 mm \/ 2PCS","offer_id":52308642660626,"sku":"XYHGY-VKA2603-048-098x1","price":26.86,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 140 mm \/ 2PCS","offer_id":52308642693394,"sku":"XYHGY-VKA2603-048-099x1","price":28.63,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 150 mm \/ 2PCS","offer_id":52308642726162,"sku":"XYHGY-VKA2603-048-100x1","price":30.67,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-03_8a531cbf-c799-4cf9-bc00-8f888cc00d18.jpg?v=1780639819"},{"product_id":"m6-m8-carriage-bolts-steel-zinc-plated-din-603","title":"M6 M8 Carriage Bolts Steel Zinc Plated – DIN 603 Cup Head Square Neck Screws","description":"\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose the right length for my carriage bolt?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Generally, select a bolt length equal to the total thickness of the materials being joined plus enough thread engagement for the nut — typically at least 1× the bolt diameter. For example, joining two 6mm (1\/4\\u2033) boards with an M6 bolt, a 12mm (1\/2\\u2033) or 16mm (5\/8\\u2033) length is typically sufficient. Always measure your stack-up before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the shear and tensile strength of these carriage bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These bolts are manufactured to DIN 603 standards and are generally rated at property class 4.6, which typically provides a tensile strength of around 400 MPa and a yield strength of around 240 MPa. For structural or load-bearing applications, please verify the exact grade with us before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these carriage bolts suitable for outdoor or wet environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The zinc plating provides moderate corrosion resistance suitable for indoor and sheltered outdoor use. For prolonged direct exposure to rain, salt spray, or high humidity, a stainless steel or hot-dip galvanized option is generally recommended.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What thread standard do these bolts use — are they compatible with standard metric nuts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. These bolts use standard ISO metric coarse threads (M6×1.0mm pitch and M8×1.25mm pitch) and are compatible with any standard DIN 934 or ISO 4032 metric hex nuts of the matching size.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How does the square neck work and why does it matter?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The square neck sits directly under the round cup head. When driven into a pre-drilled square hole or soft material like wood, the neck bites in and prevents the bolt from spinning while you tighten the nut from the other side — no wrench needed on the bolt head.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many pieces should I order for my project?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"We offer quantities of 1, 5, 10, 20, 50, and 100 pieces per size. For small repairs or prototyping, 1–5 pcs is typically enough. For deck building, fencing, or furniture projects, ordering 20–100 pcs generally offers better per-unit value.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these bolts with metal or only with wood?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"DIN 603 carriage bolts are most commonly used with wood, but they can also be used with thin metal plates when a pre-drilled square hole or a square-hole washer is used to prevent rotation. For heavy steel-to-steel connections, a hex bolt is generally a better choice.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eM6 M8 Carriage Bolts Zinc Plated — Reliable DIN 603 Fasteners for Wood \u0026amp; Light Metal\u003c\/h2\u003e\n    \u003cp\u003eWhether you're building a backyard deck, assembling outdoor furniture, or reinforcing a fence post, finding a fastener that stays put without spinning is half the battle. DIYers and contractors alike need a bolt that seats itself firmly so one person can tighten the nut solo — that's exactly what these zinc-plated M6 M8 carriage bolts are designed to do.\u003c\/p\u003e\n    \u003cp\u003eEach bolt is manufactured to the \u003cstrong\u003eDIN 603\u003c\/strong\u003e standard and features a smooth round cup head with a square neck shank. Available in \u003cstrong\u003eM6 (6mm) and M8 (8mm)\u003c\/strong\u003e diameters with lengths ranging from \u003cstrong\u003e12mm (≈1\/2\") to 25mm (≈1\")\u003c\/strong\u003e. Thread pitches are \u003cstrong\u003e1.0mm for M6\u003c\/strong\u003e and \u003cstrong\u003e1.25mm for M8\u003c\/strong\u003e, matching standard ISO metric coarse thread. The steel body is finished with a zinc plating layer for corrosion resistance in typical indoor and sheltered outdoor conditions. Order in quantities of 1, 5, 10, 20, 50, or 100 pieces to match your project scale.\u003c\/p\u003e\n    \u003cp\u003eThese carriage bolts are a go-to choice for \u003cstrong\u003ewood deck construction\u003c\/strong\u003e, \u003cstrong\u003etimber frame joinery\u003c\/strong\u003e, and \u003cstrong\u003eDIY furniture assembly\u003c\/strong\u003e — anywhere you need a flush, snag-free bolt head on the visible face of the workpiece. The square neck locks into softwood or a pre-drilled square hole in metal, making single-handed installation straightforward.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e\n    \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Fits standard ISO metric hex nuts — M6 (DIN 934, 1.0mm pitch) and M8 (DIN 934, 1.25mm pitch). Designed for use with wood, plywood, and light-gauge metal with a pre-drilled square hole or square-hole washer.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e✅ Key Features of These M6 M8 Zinc-Plated Carriage Bolts\u003c\/h2\u003e\n  \u003cul class=\"hdiy-features\"\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔘\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eDIN 603 Cup Head Design\u003c\/strong\u003e — The smooth, domed round head sits flush and snag-free on the surface, making it ideal for carriage bolt wood deck applications where appearance and safety matter.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔲\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eAnti-Spin Square Neck\u003c\/strong\u003e — The square shoulder under the head bites into wood or a matching square hole, locking the bolt in place so you can tighten the nut without holding the head — a key advantage for single-person installation.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eZinc-Plated Steel Body\u003c\/strong\u003e — The electroplated zinc finish provides a protective barrier against oxidation and light moisture, extending service life in sheltered outdoor and indoor environments.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003ePrecise ISO Metric Threading\u003c\/strong\u003e — M6×1.0mm and M8×1.25mm coarse threads are cut to standard tolerances, ensuring smooth engagement with any compatible metric hex nut for carriage bolt and nut assemblies.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlexible Quantity Options\u003c\/strong\u003e — Choose from 1 to 100 pieces per size so you can buy exactly what your project needs — from a single replacement bolt to a bulk pack for large-scale timber framing or fencing projects.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eMultiple Size Combinations\u003c\/strong\u003e — Five size variants (M6×12, M6×16, M8×16, M8×20, M8×25) cover the most common fastening depths, reducing the need to stock multiple bolt types for typical DIY and light construction work.\u003c\/span\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003e📐 Technical Specifications — DIN 603 Carriage Bolts\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eStandard\u003c\/th\u003e\n\u003ctd\u003eDIN 603\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eRound cup head (mushroom head)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eNeck Style\u003c\/th\u003e\n\u003ctd\u003eSquare neck (anti-rotation)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eCarbon steel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eZinc plated (electroplated)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Type\u003c\/th\u003e\n\u003ctd\u003eISO metric coarse thread\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Diameters\u003c\/th\u003e\n\u003ctd\u003eM6 (6mm \/ ≈1\/4\"), M8 (8mm \/ ≈5\/16\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Pitch — M6\u003c\/th\u003e\n\u003ctd\u003e1.0mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Pitch — M8\u003c\/th\u003e\n\u003ctd\u003e1.25mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e12mm (≈1\/2\"), 16mm (≈5\/8\"), 20mm (≈3\/4\"), 25mm (≈1\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eM6 Length Options\u003c\/th\u003e\n\u003ctd\u003eM6×12, M6×16\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eM8 Length Options\u003c\/th\u003e\n\u003ctd\u003eM8×16, M8×20, M8×25\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eProperty Class\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eNut Compatibility\u003c\/th\u003e\n\u003ctd\u003eStandard ISO metric hex nut (DIN 934)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eQuantity Options\u003c\/th\u003e\n\u003ctd\u003e1, 5, 10, 20, 50, 100 pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-faq\"\u003e\n    \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right length for my carriage bolt?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eGenerally, select a bolt length equal to the total thickness of the materials being joined plus enough thread engagement for the nut — typically at least 1× the bolt diameter. For example, joining two 6mm (1\/4\") boards with an M6 bolt, a 12mm (1\/2\") or 16mm (5\/8\") length is typically sufficient. Always measure your stack-up before ordering.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the shear and tensile strength of these carriage bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese bolts are manufactured to DIN 603 standards and are generally rated at property class 4.6, which typically provides a tensile strength of around 400 MPa and a yield strength of around 240 MPa. For structural or load-bearing applications, please verify the exact grade with us before ordering.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these carriage bolts suitable for outdoor or wet environments?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThe zinc plating provides moderate corrosion resistance suitable for indoor and sheltered outdoor use. For prolonged direct exposure to rain, salt spray, or high humidity, a stainless steel or hot-dip galvanized option is generally recommended.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat thread standard do these bolts use — are they compatible with standard metric nuts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eYes. These bolts use standard ISO metric coarse threads (M6×1.0mm pitch and M8×1.25mm pitch) and are compatible with any standard DIN 934 or ISO 4032 metric hex nuts of the matching size.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow does the square neck work and why does it matter?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThe square neck sits directly under the round cup head. When driven into a pre-drilled square hole or soft material like wood, the neck bites in and prevents the bolt from spinning while you tighten the nut from the other side — no wrench needed on the bolt head.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow many pieces should I order for my project?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eWe offer quantities of 1, 5, 10, 20, 50, and 100 pieces per size. For small repairs or prototyping, 1–5 pcs is typically enough. For deck building, fencing, or furniture projects, ordering 20–100 pcs generally offers better per-unit value.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use these bolts with metal or only with wood?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eDIN 603 carriage bolts are most commonly used with wood, but they can also be used with thin metal plates when a pre-drilled square hole or a square-hole washer is used to prevent rotation. For heavy steel-to-steel connections, a hex bolt is generally a better choice.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your \u003cstrong\u003esize and quantity\u003c\/strong\u003e above, then add to cart — ships from our US warehouse.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M6 \/ 12mm \/ 1PCS","offer_id":52308643053842,"sku":"GYLZWMGBRT26223x1","price":1.46,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 16mm \/ 1PCS","offer_id":52308643086610,"sku":"GYLZWMGBRT26224x1","price":1.46,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 16mm \/ 1PCS","offer_id":52308643119378,"sku":"GYLZWMGBRT26225x1","price":1.46,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 20mm \/ 1PCS","offer_id":52308643152146,"sku":"GYLZWMGBRT26226x1","price":1.46,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 25mm \/ 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100PCS","offer_id":52308643873042,"sku":"GYLZWMGBRT26223x100","price":21.81,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 16mm \/ 100PCS","offer_id":52308643905810,"sku":"GYLZWMGBRT26224x100","price":24.75,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 16mm \/ 100PCS","offer_id":52308643938578,"sku":"GYLZWMGBRT26225x100","price":40.46,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 20mm \/ 100PCS","offer_id":52308643971346,"sku":"GYLZWMGBRT26226x100","price":46.69,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 25mm \/ 100PCS","offer_id":52308644004114,"sku":"GYLZWMGBRT26227x100","price":50.51,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/6f6ca16d-6bac-4257-9064-3b5c4dc56d08.jpg?v=1780639921"},{"product_id":"a2-stainless-steel-carriage-bolts-coach-bolts-m3-m12","title":"A2 Stainless Steel Carriage Bolts (Coach Bolts) — M3 M4 M5 M6 M8 M10 M12","description":"\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose the right carriage bolt length?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Generally, add the thickness of all materials being joined, then add enough for a washer and nut — typically 6–12mm (about 1\/4\\\"–1\/2\\\") of thread should protrude. For example, joining two 20mm boards would typically call for a 50mm (≈2\\\") bolt.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What diameter carriage bolt do I need?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"For light-duty timber or panel work, M6 or M8 is generally sufficient. For structural or load-bearing connections, M10 or M12 is typically recommended. Always check the load requirements for your specific application.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these carriage bolts suitable for outdoor use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. A2 stainless steel (also known as 304 stainless) offers good corrosion resistance for most outdoor environments including garden furniture, decking, and fencing. For marine or coastal environments with heavy salt exposure, A4 (316) stainless is generally preferred.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What thread standard do these carriage bolts use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These bolts use standard ISO metric coarse thread (M3–M12). They are compatible with standard metric nuts and washers of the same diameter.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do I need a special tool to install a carriage bolt?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"No special tools are required. The domed head and square neck are designed to be driven flush into timber by hand or with a mallet, preventing rotation while you tighten the nut from the other side with a standard wrench or socket.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the tensile strength of A2 stainless steel carriage bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A2-70 stainless steel fasteners typically have a minimum tensile strength of 700 MPa (≈101,500 psi). Actual load capacity depends on bolt diameter, thread engagement, and the materials being joined.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these bolts with pressure-treated lumber?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. A2 stainless steel is generally compatible with most pressure-treated lumber. It resists the corrosive chemicals commonly used in treated wood better than standard zinc-plated fasteners.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eA2 Stainless Steel Carriage Bolts — Reliable Fastening for Wood, Metal \u0026amp; Outdoor Projects\u003c\/h2\u003e\n    \u003cp\u003eWhen a standard bolt just spins in place and ruins your workpiece, you need a fastener designed to grip and stay put. A2 stainless steel carriage bolts are the go-to choice for woodworkers, contractors, and serious DIYers who need a clean, tamper-resistant connection in timber, composite panels, or light metalwork — without the rust that plagues ordinary zinc-plated hardware.\u003c\/p\u003e\n    \u003cp\u003eEach bolt features a smooth domed head and a square neck that bites into the material to prevent rotation during tightening. Available in metric thread sizes M3 through M12 and lengths from 8mm (≈5\/16\") to 100mm (≈3-15\/16\"), these cup square coach bolts are sold individually or in packs of 3 or 5 so you can order exactly what your project requires. Material: A2 stainless steel (304 grade), ISO metric coarse thread.\u003c\/p\u003e\n    \u003cp\u003eTypical applications include garden furniture assembly, deck and fence construction, timber frame joinery, gate hardware, and playground equipment — anywhere you need a metric carriage bolt for outdoor wood connections that will hold up season after season.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e\n    \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Standard ISO metric coarse thread (M3–M12). Pair with metric hex nuts and flat washers of the matching diameter. Not compatible with UNC\/UNF inch-thread hardware.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-note\"\u003e\n    \u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e\n    \u003cstrong\u003eSize confirmation:\u003c\/strong\u003e Variant names follow the format \u003cstrong\u003eDiameter × Length\u003c\/strong\u003e (e.g., M8×50 = 8mm diameter, 50mm long). Please verify your required size before ordering — see the FAQ below for length selection guidance.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e✅ Key Features of These A2 Stainless Steel Carriage Bolts\u003c\/h2\u003e\n  \u003cul class=\"hdiy-features\"\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eA2 Stainless Steel Construction\u003c\/strong\u003e — Grade 304 stainless resists rust, oxidation, and staining, making these metric carriage bolts for outdoor wood connections a long-lasting choice in wet or humid environments.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔲\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eCup Square (Coach Bolt) Head Design\u003c\/strong\u003e — The low-profile domed head and square shank neck lock into timber or pre-drilled holes to prevent spinning, so you can tighten the nut single-handed without holding the bolt.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eWide Size Range: M3–M12, 8–100mm\u003c\/strong\u003e — From small M3×8mm fasteners for light panel work to heavy-duty M12×100mm (≈3-15\/16\") bolts for structural timber joinery, one listing covers your full project.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔗\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eISO Metric Coarse Thread\u003c\/strong\u003e — Standard pitch threading ensures compatibility with any metric nut or coupling nut of the same diameter, no guesswork on thread matching.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🌲\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eSuitable for Pressure-Treated Lumber\u003c\/strong\u003e — A2 stainless holds up against the preservative chemicals in treated wood that quickly corrode standard zinc-plated fasteners used in deck and fence construction.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e — Order 1, 3, or 5 bolts per size so you can match your exact project count, reduce waste, and avoid overstocking hardware you won't use.\u003c\/span\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003e📐 Technical Specifications — A2 Stainless Steel Cup Square Carriage Bolts\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eA2 Stainless Steel (Grade 304)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eCup Square (Dome \/ Coach Bolt)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eDrive Style\u003c\/th\u003e\n\u003ctd\u003eNone — square neck, nut-driven\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eISO Metric Coarse (DIN 603)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Diameter Range\u003c\/th\u003e\n\u003ctd\u003eM3 – M12\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eLength Range\u003c\/th\u003e\n\u003ctd\u003e8mm (≈5\/16\") – 100mm (≈3-15\/16\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural stainless (no coating)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTensile Strength (typical)\u003c\/th\u003e\n\u003ctd\u003e700 MPa (A2-70 grade)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePack Quantities Available\u003c\/th\u003e\n\u003ctd\u003e1, 3, or 5 bolts per order\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCompatible Fasteners\u003c\/th\u003e\n\u003ctd\u003eMetric hex nuts, flat washers (same diameter)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eRecommended Applications\u003c\/th\u003e\n\u003ctd\u003eTimber joinery, decking, fencing, garden furniture, gate hardware\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-faq\"\u003e\n    \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right carriage bolt length?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eGenerally, add the total thickness of all materials being joined, then allow enough thread to fit a washer and nut — typically 6–12mm (about 1\/4\"–1\/2\") of thread should protrude beyond the nut. For example, joining two 20mm boards would typically call for a 50mm (≈2\") bolt. When in doubt, size up rather than down.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat diameter carriage bolt do I need for my project?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eFor light-duty panel or furniture work, M6 or M8 is generally sufficient. For structural or load-bearing timber connections such as decking joists or gate posts, M10 or M12 is typically recommended. Always verify the load requirements for your specific application before selecting a size.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these carriage bolts suitable for outdoor and weathered environments?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eYes. A2 stainless steel (304 grade) offers good corrosion resistance for most outdoor environments including garden furniture, decking, fencing, and playground equipment. For marine or coastal environments with heavy salt spray exposure, A4 (316) stainless is generally preferred for maximum corrosion resistance.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat thread standard do these bolts use — are they compatible with standard nuts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese bolts use standard ISO metric coarse thread conforming to DIN 603. They are compatible with any standard metric hex nut and flat washer of the matching diameter (e.g., an M8 carriage bolt takes an M8 nut). They are \u003cstrong\u003enot\u003c\/strong\u003e compatible with UNC or UNF inch-thread hardware.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDo I need a special tool to install a carriage bolt?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eNo special tools are required. The smooth domed head and square neck are designed to be seated flush into timber by hand or with a mallet. The square neck grips the material and prevents rotation while you tighten the nut from the opposite side using a standard wrench or socket set.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the tensile strength of these A2 stainless carriage bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA2-70 grade stainless steel fasteners typically have a minimum tensile strength of 700 MPa (≈101,500 psi). Actual load capacity in your application depends on bolt diameter, thread engagement length, and the materials being joined. For critical structural applications, consult an engineer.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use these bolts with pressure-treated lumber?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eYes. A2 stainless steel is generally compatible with most pressure-treated lumber. It resists the copper-based preservative chemicals used in treated wood far better than standard zinc-plated or hot-dip galvanized fasteners, making it a reliable choice for treated deck boards and fence posts.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your \u003cstrong\u003esize and quantity\u003c\/strong\u003e above, then add to cart — ships from our US warehouse.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M3 \/ 8mm \/ 1PCS","offer_id":52308644036882,"sku":"WWLFBRTQJD023309x1","price":2.03,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 10mm \/ 1PCS","offer_id":52308644069650,"sku":"WWLFBRTQJD023310x1","price":2.03,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 14mm \/ 1PCS","offer_id":52308644102418,"sku":"WWLFBRTQJD023311x1","price":2.03,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 16mm \/ 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1PCS","offer_id":52308645052690,"sku":"WWLFBRTQJD018774x1","price":2.03,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 20mm \/ 1PCS","offer_id":52308645085458,"sku":"WWLFBRTQJD018775x1","price":2.11,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 25mm \/ 1PCS","offer_id":52308645118226,"sku":"WWLFBRTQJD018776x1","price":2.11,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 30mm \/ 1PCS","offer_id":52308645150994,"sku":"WWLFBRTQJD018777x1","price":2.11,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 35mm \/ 1PCS","offer_id":52308645183762,"sku":"WWLFBRTQJD018778x1","price":2.11,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 40mm \/ 1PCS","offer_id":52308645216530,"sku":"WWLFBRTQJD018779x1","price":2.11,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 45mm \/ 1PCS","offer_id":52308645249298,"sku":"WWLFBRTQJD018780x1","price":2.16,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 50mm \/ 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For example, joining two 20mm (≈3\/4\\u201d) boards typically calls for a bolt of at least 50mm (≈2\\u201d). When in doubt, size up — a bolt that is slightly too long can be trimmed or fitted with extra washers.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What tensile strength can I expect from A2 stainless steel carriage bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A2 stainless steel (ISO 3506 property class 70) generally provides a minimum tensile strength of 700 MPa and a proof load stress of 450 MPa. Actual load capacity depends on bolt diameter, thread engagement, and the materials being fastened. For structural or load-bearing applications, consult an engineer.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these carriage bolts suitable for outdoor or marine use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A2 stainless steel offers good corrosion resistance and is suitable for most outdoor environments including garden furniture, decking, and fencing. For highly aggressive marine or coastal environments with prolonged saltwater exposure, A4 (316) stainless steel is generally recommended.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What thread standard do these carriage bolts use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These bolts use standard ISO metric coarse threads (DIN 603 \/ ISO 8677 profile). The thread pitch varies by diameter — for example, M6 is typically 1.0mm pitch, M8 is 1.25mm pitch, and M10 is 1.5mm pitch. They are compatible with standard metric hex nuts and washers.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How does the cup square neck prevent the bolt from spinning?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The square section directly beneath the domed head bites into the material as the nut is tightened, locking the bolt in place without needing a wrench on the head. This makes carriage bolts ideal for wood-to-wood and wood-to-metal connections where one side is inaccessible.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Which size should I choose for connecting timber framing?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"For light timber framing and furniture, M6 or M8 bolts are generally sufficient. For heavier structural connections such as pergola posts or deck ledger boards, M10 or M12 is typically preferred. Always verify load requirements against your local building code.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do I need a washer with these carriage bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A flat washer under the nut is strongly recommended. It distributes the clamping load over a larger surface area, reduces the risk of the nut pulling through softer materials like wood or plastic, and makes future disassembly easier.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003c!-- ① OVERVIEW --\u003e\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eA2 Stainless Steel Carriage Bolts — Reliable Fastening for Wood, Metal \u0026amp; Outdoor Projects\u003c\/h2\u003e\n    \u003cp\u003eWhether you're building a backyard deck, assembling garden furniture, or tackling a structural timber frame, finding a fastener that stays put without spinning — and won't rust out after one rainy season — is half the battle. These A2 stainless steel carriage bolts are designed for DIYers, woodworkers, and contractors who need a dependable, corrosion-resistant connection the first time, every time.\u003c\/p\u003e\n    \u003cp\u003eEach bolt features the classic cup square neck (DIN 603) profile: a smooth domed head for a clean finished look and a square shank section that locks into wood or pre-drilled metal to prevent rotation while you tighten the nut. Available in diameters from M4 to M12 and lengths from 10mm (≈3\/8\") to 100mm (≈3-15\/16\"), with pack sizes ranging from 1 to 500 pieces to suit both one-off repairs and bulk project needs.\u003c\/p\u003e\n    \u003cp\u003eTypical applications include deck and pergola construction, outdoor furniture assembly, timber-frame connections, playground equipment, and general workshop joinery — anywhere you need a flush-head fastener that resists the elements and stays tight under vibration.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- ② COMPATIBILITY BAR --\u003e\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e\n    \u003cstrong\u003eThread Standard:\u003c\/strong\u003e ISO metric coarse thread (DIN 603 \/ ISO 8677) — compatible with standard metric hex nuts, nyloc nuts, and flat washers. Sizes M4 through M12.\n  \u003c\/div\u003e\n\n  \u003c!-- ③ KEY FEATURES --\u003e\n  \u003ch2\u003e✅ Key Features of These A2 Stainless Steel Carriage Bolts\u003c\/h2\u003e\n  \u003cul class=\"hdiy-features\"\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eA2 Stainless Steel Construction\u003c\/strong\u003e — Manufactured from A2 (304) stainless steel, these carriage bolts resist rust, oxidation, and staining in outdoor and humid environments, making them a long-lasting choice for exterior timber projects.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🔲\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eCup Square Neck Anti-Rotation Design\u003c\/strong\u003e — The square shank section beneath the domed head embeds into wood or slots into a square-punched hole in metal, preventing the bolt from spinning during tightening — no wrench needed on the head side.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eWide Size Range — M4 to M12, 10mm to 100mm\u003c\/strong\u003e — With over 60 diameter-and-length combinations, you can match the exact fastener to your material stack-up, from light furniture joints (M4 × 10mm) to heavy structural timber connections (M12 × 100mm).\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eSmooth Domed Head for a Clean Finish\u003c\/strong\u003e — The low-profile rounded head sits flush against the surface without sharp edges, reducing snag hazards on playground equipment, furniture, and handrails where exposed fastener heads are a concern.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eFlexible Pack Quantities — 1 to 500 Pieces\u003c\/strong\u003e — Order a single bolt for a quick repair or a bulk pack of 500 for a large-scale build. Flexible quantities mean you only pay for what you need, reducing waste on smaller jobs.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e✅\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eDIN 603 \/ ISO 8677 Compliant Profile\u003c\/strong\u003e — Conforms to internationally recognized dimensional standards, ensuring consistent thread engagement with standard metric nuts and compatibility with metric hardware across brands and suppliers.\u003c\/span\u003e\n    \u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003c!-- ④ SPECIFICATIONS --\u003e\n  \u003ch2\u003e📐 Technical Specifications — A2 Stainless Steel Carriage Bolts\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eCarriage Bolt (Cup Square Neck \/ Round Head Square Neck)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eStandard\u003c\/th\u003e\n\u003ctd\u003eDIN 603 \/ ISO 8677\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eA2 Stainless Steel (AISI 304 equivalent)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Type\u003c\/th\u003e\n\u003ctd\u003eISO Metric Coarse Thread\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Pitch\u003c\/th\u003e\n\u003ctd\u003eM4: 0.7mm | M5: 0.8mm | M6: 1.0mm | M8: 1.25mm | M10: 1.5mm | M12: 1.75mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Diameters\u003c\/th\u003e\n\u003ctd\u003eM4, M5, M6, M8, M10, M12\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e10mm (≈3\/8\") – 100mm (≈3-15\/16\") — see variant options for full list\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eDomed \/ Round (smooth, no drive recess)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eNeck Style\u003c\/th\u003e\n\u003ctd\u003eCup Square (square shank section under head)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eMill \/ Natural Stainless (no coating)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTensile Strength (typical)\u003c\/th\u003e\n\u003ctd\u003e≥ 700 MPa (ISO 3506 Property Class 70)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePack Sizes Available\u003c\/th\u003e\n\u003ctd\u003e1, 2, 5, 10, 20, 500 pieces\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCompatible Fasteners\u003c\/th\u003e\n\u003ctd\u003eStandard metric hex nuts, nyloc nuts, flat washers\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eRecommended Hole Size\u003c\/th\u003e\n\u003ctd\u003eSee variant options — typically bolt diameter + 0.2–0.5mm clearance\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- ⑤ FAQ --\u003e\n  \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-faq\"\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right carriage bolt length?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA general rule is to add the total thickness of all materials being joined, then add at least one full nut height plus a few threads of engagement. For example, joining two 20mm (≈3\/4\") boards typically calls for a bolt of at least 50mm (≈2\"). When in doubt, size up — a bolt that is slightly too long can be fitted with extra washers or a coupling nut.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat tensile strength can I expect from these A2 stainless steel carriage bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA2 stainless steel (ISO 3506 property class 70) generally provides a minimum tensile strength of 700 MPa and a proof load stress of approximately 450 MPa. Actual load capacity depends on bolt diameter, thread engagement length, and the materials being fastened. For structural or load-bearing applications, always consult a qualified engineer.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these carriage bolts suitable for outdoor or marine environments?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA2 stainless steel offers good corrosion resistance and is suitable for most outdoor applications including garden furniture, decking, fencing, and playground equipment. For highly aggressive environments with prolonged saltwater or chemical exposure — such as coastal marine installations — A4 (316) stainless steel is generally recommended for superior chloride resistance.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat thread standard do these bolts use, and are they compatible with standard nuts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese bolts use standard ISO metric coarse threads conforming to DIN 603 \/ ISO 8677. Thread pitch varies by diameter: M4 = 0.7mm, M5 = 0.8mm, M6 = 1.0mm, M8 = 1.25mm, M10 = 1.5mm, M12 = 1.75mm. They are fully compatible with standard metric hex nuts, nyloc (prevailing torque) nuts, and flat washers available from any hardware supplier.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow does the cup square neck stop the bolt from spinning when I tighten the nut?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThe square section directly beneath the domed head bites into the wood grain or seats into a square-punched hole in metal sheet as the nut is tightened. This mechanical lock prevents rotation without requiring a wrench or screwdriver on the head side — ideal for connections where one face is inaccessible or where a clean, tool-mark-free surface is required.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhich diameter should I choose for timber framing or deck construction?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eFor light timber furniture and shelving, M6 or M8 bolts are typically sufficient. For heavier structural connections such as pergola posts, deck ledger boards, or load-bearing beams, M10 or M12 is generally preferred. Always verify load requirements against your local building code and consult a structural engineer for critical applications.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDo I need to use a washer with these carriage bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA flat washer under the nut is strongly recommended in most applications. It distributes the clamping load over a larger surface area, reduces the risk of the nut pulling through softer materials like wood or plastic sheeting, and makes future disassembly easier. For outdoor use, choose a washer in the same A2 stainless steel grade to avoid galvanic corrosion.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003c!-- ⑥ CTA BAR --\u003e\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your size and pack quantity above, then add to cart — ships from our US warehouse.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M4 \/ 10mm \/ 5PCS","offer_id":52308652523794,"sku":"GYWWWMGBRT21422x5","price":3.36,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 12mm \/ 5PCS","offer_id":52308652556562,"sku":"GYWWWMGBRT21423x5","price":3.36,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 14mm \/ 5PCS","offer_id":52308652589330,"sku":"GYWWWMGBRT21424x5","price":3.36,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 16mm \/ 5PCS","offer_id":52308652622098,"sku":"GYWWWMGBRT21425x5","price":3.41,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 18mm \/ 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5PCS","offer_id":52308652884242,"sku":"GYWWWMGBRT21433x5","price":3.55,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 16mm \/ 5PCS","offer_id":52308652917010,"sku":"GYWWWMGBRT21434x5","price":3.64,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 18mm \/ 5PCS","offer_id":52308652949778,"sku":"GYWWWMGBRT21435x5","price":3.7,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 20mm \/ 5PCS","offer_id":52308652982546,"sku":"GYWWWMGBRT21436x5","price":3.7,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 22mm \/ 5PCS","offer_id":52308653015314,"sku":"GYWWWMGBRT21437x5","price":3.78,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 25mm \/ 5PCS","offer_id":52308653048082,"sku":"GYWWWMGBRT21438x5","price":3.84,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 30mm \/ 5PCS","offer_id":52308653080850,"sku":"GYWWWMGBRT21439x5","price":4.22,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 35mm \/ 5PCS","offer_id":52308653113618,"sku":"GYWWWMGBRT21440x5","price":4.5,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 40mm \/ 5PCS","offer_id":52308653146386,"sku":"GYWWWMGBRT21441x5","price":4.84,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 45mm \/ 5PCS","offer_id":52308653179154,"sku":"GYWWWMGBRT21442x5","price":5.21,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 50mm \/ 5PCS","offer_id":52308653211922,"sku":"GYWWWMGBRT21443x5","price":5.7,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 12mm \/ 5PCS","offer_id":52308653244690,"sku":"GYWWWMGBRT21444x5","price":3.7,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 16mm \/ 5PCS","offer_id":52308653277458,"sku":"GYWWWMGBRT21445x5","price":3.84,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 20mm \/ 5PCS","offer_id":52308653310226,"sku":"GYWWWMGBRT21446x5","price":4.07,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 25mm \/ 5PCS","offer_id":52308653342994,"sku":"GYWWWMGBRT21447x5","price":4.41,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 30mm \/ 5PCS","offer_id":52308653375762,"sku":"GYWWWMGBRT21448x5","price":4.84,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 35mm \/ 5PCS","offer_id":52308653408530,"sku":"GYWWWMGBRT21449x5","price":5.21,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 40mm \/ 5PCS","offer_id":52308653441298,"sku":"GYWWWMGBRT21450x5","price":5.55,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 45mm \/ 5PCS","offer_id":52308653474066,"sku":"GYWWWMGBRT21451x5","price":5.93,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 50mm \/ 5PCS","offer_id":52308653506834,"sku":"GYWWWMGBRT21452x5","price":6.35,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 55mm \/ 5PCS","offer_id":52308653539602,"sku":"GYWWWMGBRT21453x5","price":6.79,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 60mm \/ 5PCS","offer_id":52308653572370,"sku":"GYWWWMGBRT21454x5","price":7.13,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 12mm \/ 5PCS","offer_id":52308653605138,"sku":"GYWWWMGBRT21455x5","price":5.55,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 16mm \/ 5PCS","offer_id":52308653637906,"sku":"GYWWWMGBRT21456x5","price":6.12,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 20mm \/ 5PCS","offer_id":52308653670674,"sku":"GYWWWMGBRT21457x5","price":6.79,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 25mm \/ 5PCS","offer_id":52308653703442,"sku":"GYWWWMGBRT21458x5","price":7.13,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 30mm \/ 5PCS","offer_id":52308653736210,"sku":"GYWWWMGBRT21459x5","price":7.98,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 35mm \/ 5PCS","offer_id":52308653768978,"sku":"GYWWWMGBRT21460x5","price":8.79,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 40mm \/ 5PCS","offer_id":52308653801746,"sku":"GYWWWMGBRT21461x5","price":9.49,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 45mm \/ 5PCS","offer_id":52308653834514,"sku":"GYWWWMGBRT21462x5","price":10.21,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 50mm \/ 5PCS","offer_id":52308653867282,"sku":"GYWWWMGBRT21463x5","price":10.84,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 55mm \/ 5PCS","offer_id":52308653900050,"sku":"GYWWWMGBRT21464x5","price":11.55,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 60mm \/ 5PCS","offer_id":52308653932818,"sku":"GYWWWMGBRT21465x5","price":12.27,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 70mm \/ 5PCS","offer_id":52308653965586,"sku":"GYWWWMGBRT21466x5","price":13.7,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 80mm \/ 5PCS","offer_id":52308653998354,"sku":"GYWWWMGBRT21467x5","price":15.12,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 20mm \/ 5PCS","offer_id":52308654031122,"sku":"GYWWWMGBRT21468x5","price":10.98,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 25mm \/ 5PCS","offer_id":52308654063890,"sku":"GYWWWMGBRT21469x5","price":11.93,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 30mm \/ 5PCS","offer_id":52308654096658,"sku":"GYWWWMGBRT21470x5","price":13.07,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 35mm \/ 5PCS","offer_id":52308654129426,"sku":"GYWWWMGBRT21471x5","price":14.21,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 40mm \/ 5PCS","offer_id":52308654162194,"sku":"GYWWWMGBRT21472x5","price":15.12,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 45mm \/ 5PCS","offer_id":52308654194962,"sku":"GYWWWMGBRT21473x5","price":16.21,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 50mm \/ 5PCS","offer_id":52308654227730,"sku":"GYWWWMGBRT21474x5","price":17.26,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 55mm \/ 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500PCS","offer_id":52308660650258,"sku":"GYWWWMGBRT21458x500","price":508.37,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/5ca5f74e-8f39-46a8-9aec-c5bc05a6c271.jpg?v=1780640581"},{"product_id":"a2-stainless-steel-cup-square-carriage-bolts-coach-bolt-m4-m5-m6-m8","title":"A2 Stainless Steel Cup Square Carriage Bolts (Coach Bolts) — M4 M5 M6 M8","description":"\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose the right length for a carriage bolt?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure the total thickness of the materials being joined, then add enough length for a washer and nut — typically 6–12mm (about 1\/4\\\"–1\/2\\\") beyond the material. For example, joining two 20mm (≈3\/4\\\") boards would generally call for a bolt at least 50mm (≈2\\\") long.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the load-bearing or shear strength of these carriage bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A2 stainless steel carriage bolts are generally rated to property class 70 (ISO 3506), which typically provides a tensile strength of around 700 MPa. Actual load capacity depends on bolt diameter, length, and the materials being fastened. Consult an engineer for structural applications.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these carriage bolts suitable for outdoor or marine use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. A2 stainless steel offers good corrosion resistance for most outdoor environments including garden structures, decking, and fencing. For highly aggressive marine or coastal environments, A4 (316) stainless steel is generally recommended.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What thread standard do these carriage bolts use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These bolts use standard ISO metric coarse threads (DIN 603 \/ ISO 8677 equivalent). M4, M5, M6, and M8 are all standard metric sizes compatible with corresponding metric nuts and washers.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do I need a special tool to install a carriage bolt?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"No special tools are required. The cup square (domed) head is designed to be driven flush into wood, preventing rotation. You simply need a hammer to seat the head, then tighten the nut from the opposite side with a standard wrench or socket.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between a carriage bolt and a regular hex bolt?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A carriage bolt (coach bolt) has a smooth domed head and a square neck that bites into wood to prevent spinning during tightening — no wrench needed on the bolt head. A hex bolt has a hexagonal head that requires a wrench on both ends. Carriage bolts are preferred for wood-to-wood and wood-to-metal connections.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Which size should I choose for timber framing or decking?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"For light timber joinery and decking boards, M6 or M8 carriage bolts are most commonly used. M8 is generally preferred for structural connections where higher clamping force is needed. Always verify with your local building code or a structural engineer.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eA2 Stainless Steel Carriage Bolts — Reliable Fastening for Wood, Metal \u0026amp; Outdoor Structures\u003c\/h2\u003e\n    \u003cp\u003eWhether you're building a garden gate, assembling deck framing, or securing timber joints, finding a fastener that won't rust, loosen, or strip is half the battle. These A2 stainless steel cup square carriage bolts are designed for DIYers, contractors, and woodworkers who need a dependable, corrosion-resistant connection without the hassle of holding the bolt head during tightening.\u003c\/p\u003e\n    \u003cp\u003eEach bolt features a smooth domed head with a square neck shank, manufactured to DIN 603 \/ ISO 8677 standards in A2 (304) stainless steel. Available in thread diameters M4, M5, M6, and M8, with lengths ranging from 10mm (≈3\/8\") to 80mm (≈3-1\/8\"), sold in flexible pack quantities of 2, 5, 10, 20, 50, or 100 pieces so you can order exactly what your project requires.\u003c\/p\u003e\n    \u003cp\u003eTypical applications include timber deck construction with M6 or M8 carriage bolts through joists, garden furniture assembly using M5 stainless coach bolts for rust-free outdoor joints, and light structural woodworking where a flush, tamper-resistant bolt head is needed on the visible face.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e\n    \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Standard ISO metric coarse thread — fits all metric nuts and washers in M4, M5, M6, and M8. Compatible with DIN 934 hex nuts and DIN 125 flat washers.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-note\"\u003e\n    \u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e\n    \u003cstrong\u003eNote:\u003c\/strong\u003e Bolt length is measured from under the head to the tip. Always confirm total material thickness before selecting length. For marine or coastal environments, consider A4 (316) stainless steel instead.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e✅ Key Features of These A2 Stainless Steel Carriage Bolts\u003c\/h2\u003e\n  \u003cul class=\"hdiy-features\"\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eA2 Stainless Steel Construction\u003c\/strong\u003e — Made from 304-grade stainless steel for solid corrosion resistance in outdoor, damp, and general-purpose environments, without the surface rust common on zinc-plated alternatives.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔲\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eCup Square (Domed) Head Design\u003c\/strong\u003e — The smooth rounded head sits flush and tamper-resistant on the visible face, while the square neck bites into timber to prevent rotation during nut tightening — no wrench needed on the bolt side.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eWide Size Range: M4 to M8, 10mm to 80mm\u003c\/strong\u003e — Covers the most common metric carriage bolt sizes for light joinery through medium structural timber connections, with lengths available in both millimeter and inch-equivalent spans.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e — Order as few as 2 bolts for a quick repair or up to 100 for a full deck or framing project, reducing waste and keeping your hardware costs in line with actual job requirements.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eDIN 603 \/ ISO 8677 Standard\u003c\/strong\u003e — Manufactured to recognized international fastener standards, ensuring consistent thread pitch, head dimensions, and mechanical properties across all sizes for reliable, repeatable installations.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🪵\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eIdeal for Wood-to-Wood and Wood-to-Metal Joints\u003c\/strong\u003e — The square neck shank is specifically engineered to grip timber grain, making these stainless coach bolts the go-to choice for deck boards, fence rails, gate hardware, and outdoor furniture frames.\u003c\/span\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003e📐 Technical Specifications — A2 Stainless Steel Cup Square Carriage Bolts\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eA2 Stainless Steel (304 grade)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eCup Square (Domed \/ Mushroom Head)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eNeck Type\u003c\/th\u003e\n\u003ctd\u003eSquare neck (anti-rotation)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eISO Metric Coarse (DIN 603 \/ ISO 8677)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Diameters\u003c\/th\u003e\n\u003ctd\u003eM4, M5, M6, M8\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e10mm (≈3\/8\") – 80mm (≈3-1\/8\"); see variant options for full range\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePack Quantities\u003c\/th\u003e\n\u003ctd\u003e2, 5, 10, 20, 50, 100 pieces\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural stainless (no coating)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTensile Strength\u003c\/th\u003e\n\u003ctd\u003eTypically ~700 MPa (Property Class 70, ISO 3506)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eDrive Style\u003c\/th\u003e\n\u003ctd\u003eNo drive required (square neck self-locks in timber)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCompatible Nut\u003c\/th\u003e\n\u003ctd\u003eDIN 934 Metric Hex Nut (M4 \/ M5 \/ M6 \/ M8)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCompatible Washer\u003c\/th\u003e\n\u003ctd\u003eDIN 125 Flat Washer (M4 \/ M5 \/ M6 \/ M8)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-faq\"\u003e\n    \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right length for a carriage bolt?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eMeasure the total thickness of the materials being joined, then add enough length for a washer and nut — typically 6–12mm (about 1\/4\"–1\/2\") beyond the material. For example, joining two 20mm (≈3\/4\") boards would generally call for a bolt at least 50mm (≈2\") long. When in doubt, size up — a slightly longer bolt can always be trimmed or accommodated with an extra washer.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the load-bearing or shear strength of these carriage bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA2 stainless steel carriage bolts are generally rated to property class 70 (ISO 3506), which typically provides a tensile strength of around 700 MPa. Actual load capacity depends on bolt diameter, length, and the materials being fastened. M8 bolts carry significantly more load than M4. Consult a structural engineer for load-critical applications.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these carriage bolts suitable for outdoor or marine use?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eYes — A2 stainless steel offers good corrosion resistance for most outdoor environments including garden structures, decking, fencing, and pergolas. For highly aggressive marine or coastal salt-spray environments, A4 (316) stainless steel is generally recommended for longer service life. These bolts are not suitable for use with treated lumber containing copper-based preservatives without verifying compatibility.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat thread standard do these carriage bolts use, and what nuts are compatible?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese bolts use standard ISO metric coarse threads (DIN 603 \/ ISO 8677 equivalent). M4, M5, M6, and M8 are all standard metric sizes. They are compatible with DIN 934 metric hex nuts and DIN 125 flat washers in the corresponding size. Standard metric thread pitch applies: M4 = 0.7mm, M5 = 0.8mm, M6 = 1.0mm, M8 = 1.25mm.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDo I need a special tool to install a carriage bolt?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eNo special tools are required. The cup square (domed) head is designed to be driven flush into wood, preventing rotation. You simply need a hammer or mallet to seat the square neck into the timber, then tighten the nut from the opposite side with a standard wrench or socket set. No wrench is needed on the bolt head side, making installation faster in tight spaces.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the difference between a carriage bolt and a regular hex bolt?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA carriage bolt (also called a coach bolt) has a smooth domed head and a square neck that bites into wood to prevent spinning during tightening — no wrench needed on the bolt head. A hex bolt has a hexagonal head that requires a wrench on both ends. Carriage bolts are preferred for wood-to-wood and wood-to-metal connections where a clean, flush, tamper-resistant head is desired on the visible face.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhich size should I choose for timber framing, decking, or garden furniture?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eFor light garden furniture and thin timber panels, M4 or M5 carriage bolts are typically sufficient. For decking boards and fence rails, M6 is the most common choice. For structural timber framing, post connections, and heavy-duty outdoor structures, M8 is generally preferred for its higher clamping force. Always verify with your local building code or a structural engineer for load-bearing applications.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow many bolts do I need for my project, and which pack size should I order?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eCount the number of connection points in your project and add 10–15% extra for mistakes or future repairs. For a small repair or prototype, the 2-pack or 5-pack is ideal. For a deck or fence project, the 20, 50, or 100-pack offers the best per-unit value. All pack sizes ship the same bolt — only the quantity differs.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your bolt size and pack quantity above, then add to cart — ships from our US warehouse.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M4 \/ 10mm \/ 2PCS","offer_id":52308661010706,"sku":"YMXVKA7710x2","price":1.35,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 12mm \/ 2PCS","offer_id":52308661043474,"sku":"YMXVKA7711x2","price":1.56,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 14mm \/ 2PCS","offer_id":52308661076242,"sku":"YMXVKA7712x2","price":1.56,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 16mm \/ 2PCS","offer_id":52308661109010,"sku":"YMXVKA7713x2","price":1.56,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 18mm \/ 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100PCS","offer_id":52308669169938,"sku":"YMXVKA7729x100","price":47.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture1of5_9cd469b6-5745-47c8-95d5-0bc4f5b6d429.jpg?v=1780640911"},{"product_id":"m10-m12-carriage-bolts-hex-flange-nuts-a2-stainless-steel","title":"M10 M12 Carriage Bolts with Hex Flange Nuts – A2 Stainless Steel Kit","description":"\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose the right bolt length for my project?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A general rule: add the thickness of all materials being joined, then add approximately 1–1.5× the bolt diameter for the nut and washer stack. For example, joining two 10mm panels with an M10 bolt typically calls for a length of 25–30mm (about 1\\\" to 1-3\/16\\\"). When in doubt, size up — a slightly longer bolt is easier to work with than one that's too short.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the tensile strength of A2 stainless steel carriage bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A2 stainless steel (304 grade) carriage bolts are generally rated at a minimum tensile strength of 500 MPa (≈72,500 psi) per ISO 3506. This is suitable for most structural and general-purpose fastening applications. For high-load or safety-critical uses, consult an engineer.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these bolts suitable for outdoor or marine use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A2 stainless steel offers good corrosion resistance and is suitable for most outdoor environments including rain, humidity, and mild coastal exposure. For heavily salt-laden marine environments, A4 (316) stainless steel is generally recommended for longer service life.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What thread standard do these carriage bolts use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These bolts follow the metric coarse thread standard (ISO 68-1 \/ DIN 603). M10 bolts typically have a 1.5mm pitch and M12 bolts a 1.75mm pitch. The included hex flange nuts are matched to the same thread standard, so no separate nut sourcing is needed.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"When should I choose M10 vs M12?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"M10 is generally used for lighter structural connections, furniture assembly, and medium-duty brackets. M12 is better suited for heavier loads, deck framing, gate hardware, and applications where greater clamping force is needed. If you're unsure, M12 provides a wider safety margin.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is a hex flange nut and why is it used with carriage bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A hex flange nut has a built-in wide bearing flange that distributes clamping load over a larger surface area — similar to using a washer, but in one piece. This reduces the chance of the nut pulling through softer materials and provides a more secure, vibration-resistant connection, making it a practical choice for wood, composite, and thin-metal assemblies.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do I need a washer with these bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The included hex flange nut already incorporates a bearing flange, so a separate nut-side washer is generally not required. On the bolt head side, a washer is recommended when fastening into soft wood or composite materials to prevent the domed head from pulling through under load.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eM10 \u0026amp; M12 Carriage Bolts with Hex Flange Nuts — A2 Stainless Steel Kit for Lasting Connections\u003c\/h2\u003e\n    \u003cp\u003eWhether you're building a backyard deck, hanging a gate, assembling outdoor furniture, or tackling a structural repair, finding fasteners that won't rust out or loosen over time is half the battle. These M10 M12 carriage bolts with hex flange nuts are designed for DIYers and tradespeople who need a reliable, corrosion-resistant connection without the guesswork of sourcing matching hardware separately.\u003c\/p\u003e\n    \u003cp\u003eEach kit pairs a round-head, square-neck carriage bolt with a matching hex flange nut — both manufactured from A2 stainless steel (304 grade). Available in M10 and M12 thread diameters, with lengths ranging from 16mm (5\/8\") to 100mm (≈3-15\/16\"), and sold in quantities of 1, 3, 5, or 8 pieces per order. The bolt's smooth domed head sits flush against the surface while the square neck locks into wood or pre-drilled square holes to prevent spinning during tightening.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include timber deck framing and railing posts, garden gate and fence hardware, outdoor furniture and pergola assembly, and general-purpose structural fastening where a stainless steel carriage bolt and flange nut combination is specified. The metric coarse thread profile ensures compatibility with standard DIN 603 hardware across the board.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e\n    \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Metric coarse thread (ISO 68-1 \/ DIN 603). M10 pitch typically 1.5mm · M12 pitch typically 1.75mm. Hex flange nuts are thread-matched and included — no separate nut required.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e✅ Key Features of These M10 M12 A2 Stainless Steel Carriage Bolts\u003c\/h2\u003e\n  \u003cul class=\"hdiy-features\"\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🦀\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eA2 Stainless Steel Construction\u003c\/strong\u003e — Made from 304-grade stainless steel for solid corrosion resistance in outdoor, humid, and mildly coastal environments without surface coatings that can chip or peel.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔒\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eAnti-Spin Square Neck\u003c\/strong\u003e — The square shoulder under the domed head bites into wood or square-punched holes, keeping the bolt stationary while you tighten the nut — no second wrench needed on the bolt side.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eHex Flange Nut Included\u003c\/strong\u003e — Each bolt ships with a matching hex flange nut whose integrated bearing flange spreads clamping load over a wider area, reducing pull-through risk in wood and composite materials.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eWide Size Selection\u003c\/strong\u003e — M10 lengths from 16mm (5\/8\") to 100mm (≈3-15\/16\") and M12 lengths from 25mm (≈1\") to 100mm (≈3-15\/16\") cover the most common structural fastening scenarios in a single product listing.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlexible Quantity Options\u003c\/strong\u003e — Order 1, 3, 5, or 8 pieces to match your exact project needs — whether you need a single replacement or a small batch for a framing job, without buying a full box of 50.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eDIN 603 Compliant Profile\u003c\/strong\u003e — The round countersunk head and square neck conform to DIN 603 geometry, making these bolts a direct fit wherever a metric carriage bolt is called out in plans or specifications.\u003c\/span\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003e📐 Technical Specifications — M10 M12 Carriage Bolt \u0026amp; Hex Flange Nut Kit\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Diameter\u003c\/th\u003e\n\u003ctd\u003eM10 \/ M12\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eMetric coarse (ISO 68-1 \/ DIN 603)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Pitch\u003c\/th\u003e\n\u003ctd\u003eM10: typically 1.5mm · M12: typically 1.75mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Lengths (M10)\u003c\/th\u003e\n\u003ctd\u003e16mm (5\/8\") · 20mm (25\/32\") · 25mm (1\") · 30mm (1-3\/16\") · 35mm (1-3\/8\") · 40mm (1-9\/16\") · 45mm (1-3\/4\") · 50mm (2\") · 55mm (2-3\/16\") · 60mm (2-3\/8\") · 70mm (2-3\/4\") · 80mm (3-1\/8\") · 90mm (3-9\/16\") · 100mm (3-15\/16\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Lengths (M12)\u003c\/th\u003e\n\u003ctd\u003e25mm (1\") · 30mm (1-3\/16\") · 35mm (1-3\/8\") · 40mm (1-9\/16\") · 45mm (1-3\/4\") · 50mm (2\") · 55mm (2-3\/16\") · 60mm (2-3\/8\") · 70mm (2-3\/4\") · 80mm (3-1\/8\") · 90mm (3-9\/16\") · 100mm (3-15\/16\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eRound dome (mushroom head), square neck\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eNut Type\u003c\/th\u003e\n\u003ctd\u003eHex flange nut (integrated bearing flange)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eA2 Stainless Steel (304 grade)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eMill \/ natural stainless (no coating)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTensile Strength\u003c\/th\u003e\n\u003ctd\u003eTypically ≥500 MPa (ISO 3506 A2-50)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 \/ 3 \/ 5 \/ 8 pieces (bolt + nut set)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eDrive Tool (nut side)\u003c\/th\u003e\n\u003ctd\u003eSee variant options (M10: typically 17mm hex · M12: typically 19mm hex)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-note\"\u003e\n    \u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e\n    \u003cstrong\u003eHeads up:\u003c\/strong\u003e Bolt length is measured from under the head to the tip. If you're fastening through thick stock, measure your material stack and add clearance for the nut before selecting a length.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-faq\"\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right bolt length for my project?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA general rule: add the thickness of all materials being joined, then add approximately 1–1.5× the bolt diameter for the nut and washer stack. For example, joining two 10mm panels with an M10 bolt typically calls for a length of 25–30mm (about 1\" to 1-3\/16\"). When in doubt, size up — a slightly longer bolt is easier to work with than one that's too short.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the tensile strength of A2 stainless steel carriage bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA2 stainless steel (304 grade) carriage bolts are generally rated at a minimum tensile strength of 500 MPa (≈72,500 psi) per ISO 3506. This is suitable for most structural and general-purpose fastening applications. For high-load or safety-critical uses, consult a structural engineer.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these bolts suitable for outdoor or marine use?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA2 stainless steel offers good corrosion resistance and is suitable for most outdoor environments including rain, humidity, and mild coastal exposure. For heavily salt-laden marine environments, A4 (316) stainless steel is generally recommended for longer service life.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat thread standard do these carriage bolts use — are they compatible with standard metric nuts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese bolts follow the metric coarse thread standard (ISO 68-1 \/ DIN 603). M10 bolts typically have a 1.5mm pitch and M12 bolts a 1.75mm pitch. The included hex flange nuts are matched to the same thread standard, so no separate nut sourcing is needed. They are also compatible with standard ISO metric hex nuts of the same size.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhen should I choose M10 vs M12 for my application?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eM10 is generally used for lighter structural connections, furniture assembly, and medium-duty brackets. M12 is better suited for heavier loads, deck framing, gate hardware, and applications where greater clamping force is needed. If you're unsure, M12 provides a wider safety margin for most outdoor structural work.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is a hex flange nut and why is it paired with carriage bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA hex flange nut has a built-in wide bearing flange that distributes clamping load over a larger surface area — similar to using a washer, but in one piece. This reduces the chance of the nut pulling through softer materials and provides a more secure, vibration-resistant connection, making it a practical choice for wood, composite, and thin-metal assemblies.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDo I need a separate washer with these bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThe included hex flange nut already incorporates a bearing flange, so a separate nut-side washer is generally not required. On the bolt head side, a washer is recommended when fastening into soft wood or composite materials to prevent the domed head from pulling through under load.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your \u003cstrong\u003esize and quantity\u003c\/strong\u003e above, then add to cart — ships from our US warehouse.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M10 \/ 16mm \/ 1PCS","offer_id":52308670185746,"sku":"GLFBLFFGLFBLFFDZ51506x1","price":7.47,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 20mm \/ 1PCS","offer_id":52308670218514,"sku":"GLFBLFFGLFBLFFDZ51507x1","price":7.53,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 25mm \/ 1PCS","offer_id":52308670251282,"sku":"GLFBLFFGLFBLFFDZ51508x1","price":7.6,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 30mm \/ 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\"@type\": \"Answer\",\n        \"text\": \"As a general rule, add the thickness of all materials being joined, then add approximately 1–1.5× the bolt diameter for thread engagement beyond the nut. For example, joining two 10mm panels with an M6 bolt typically requires at least 30mm (≈1-3\/16\\u201d) of length. When in doubt, size up — a slightly longer bolt is easier to work with than one that\\u2019s too short.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the tensile strength of A2 stainless steel carriage bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A2 stainless steel (ISO 3506 property class 70) generally has a minimum tensile strength of 700 MPa and a proof load stress of approximately 450 MPa. This makes it suitable for most structural and general-purpose fastening applications. For high-load or safety-critical uses, consult an engineer.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these carriage bolts suitable for outdoor or marine use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A2 stainless steel offers good corrosion resistance and is typically suitable for outdoor environments including garden furniture, decking, and light marine applications. For highly aggressive saltwater or chemical environments, A4 (316) stainless steel is generally recommended instead.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What thread standard do these bolts use — metric or imperial?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These are metric fasteners following the ISO\/DIN standard. M6 bolts have a standard pitch of 1.0mm and M8 bolts have a standard pitch of 1.25mm. They are not compatible with UNC\/UNF (inch) threaded holes or nuts.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do the hex flange nuts included in this kit require a separate washer?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"No. The hex flange nut features an integrated flange that acts as a built-in washer, distributing the clamping load over a wider surface area. This eliminates the need for a separate flat washer in most applications and helps prevent the nut from pulling through softer materials.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I install a carriage bolt correctly?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Drill a hole matching the bolt diameter through your material. Insert the carriage bolt from the front — the domed head sits flush on the surface. The square shank under the head bites into the material to prevent rotation. Thread the hex flange nut from the back and tighten with a wrench. No tool is needed on the bolt head side.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these bolts with wood, metal, or plastic?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Carriage bolts are commonly used with wood (decking, furniture, framing), thin metal sheet, and rigid plastics. The square neck anti-rotation feature works best in wood or soft materials. For metal applications, a square hole or a separate anti-rotation method may be needed.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003ch2\u003eM6 M8 Carriage Bolts with Hex Flange Nuts — A2 Stainless Steel for Reliable Metric Fastening\u003c\/h2\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003cp\u003eWhen a loose joint or a corroded bolt ruins a project — whether it's a garden bench, a deck railing, or a structural frame — the fix starts with the right fastener. DIYers, woodworkers, and contractors who need a clean, tamper-resistant bolt head with a matching nut that won't spin loose will find this kit built for exactly that job. The domed head of a carriage bolt sits flush and smooth on the visible face of your work, while the square shank locks it in place without needing a second wrench.\u003c\/p\u003e\n    \u003cp\u003eEach kit pairs \u003cstrong\u003eA2 stainless steel carriage bolts\u003c\/strong\u003e with matching \u003cstrong\u003ehex flange nuts\u003c\/strong\u003e. Available in M6 (lengths 10mm–90mm \/ ≈3\/8\"–3-1\/2\") and M8 (lengths 12mm–120mm \/ ≈1\/2\"–4-3\/4\"), with quantity options of 1, 5, 10, 15, or 20 pieces per order. The hex flange nut's integrated washer flange distributes clamping load evenly, eliminating the need for a separate flat washer in most applications.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include outdoor furniture assembly, deck and pergola construction, gate hardware, timber framing connections, and general workshop jigs — anywhere you need a metric carriage bolt that resists corrosion and stays put. The A2 stainless steel grade makes these a go-to choice for stainless carriage bolts for wood projects and light outdoor structural work.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e\n    \u003cstrong\u003eThread Compatibility:\u003c\/strong\u003e M6 (pitch 1.0mm) and M8 (pitch 1.25mm) — ISO metric standard. Not compatible with UNC\/UNF inch threads. Confirm your hole diameter matches the bolt shank before ordering.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e✅ Key Features of These M6 M8 Stainless Steel Carriage Bolts with Flange Nuts\u003c\/h2\u003e\n\n  \u003cul class=\"hdiy-features\"\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔘\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eDomed, Tool-Free Head\u003c\/strong\u003e — The smooth rounded head sits flush on the surface and requires no wrench on the bolt side, making it ideal for carriage bolts for wood furniture and decking where a clean finish matters.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔒\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eSquare-Neck Anti-Rotation Shank\u003c\/strong\u003e — The square section under the head bites into wood or soft material to prevent spinning during tightening, so one person can fasten without holding the bolt head.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eA2 Stainless Steel Construction\u003c\/strong\u003e — Resists rust and oxidation in outdoor and damp environments, making these stainless carriage bolts suitable for garden, deck, and light marine applications without surface treatment.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eIntegrated Flange Nut\u003c\/strong\u003e — The hex flange nut's built-in washer face spreads the clamping load over a wider area, reducing pull-through risk on softer substrates and eliminating a separate washer from your parts list.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eWide Size Range\u003c\/strong\u003e — M6 from 10mm (≈3\/8\") to 90mm (≈3-1\/2\") and M8 from 12mm (≈1\/2\") to 120mm (≈4-3\/4\") covers the most common metric bolt lengths for structural and furniture fastening in one listing.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlexible Quantity Options\u003c\/strong\u003e — Order 1, 5, 10, 15, or 20 pieces to match your project scale — whether you need a single replacement bolt or a bulk supply for a larger build.\u003c\/span\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003e📐 Technical Specifications — M6 M8 Carriage Bolt and Hex Flange Nut Kit\u003c\/h2\u003e\n\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eBolt Type\u003c\/th\u003e\n\u003ctd\u003eCarriage Bolt (Round Head, Square Neck)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eNut Type\u003c\/th\u003e\n\u003ctd\u003eHex Flange Nut (integrated washer flange)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eA2 Stainless Steel (ISO 3506)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eISO Metric Coarse\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eM6 Thread Pitch\u003c\/th\u003e\n\u003ctd\u003e1.0mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eM8 Thread Pitch\u003c\/th\u003e\n\u003ctd\u003e1.25mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Diameters\u003c\/th\u003e\n\u003ctd\u003eM6, M8\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eM6 Length Range\u003c\/th\u003e\n\u003ctd\u003e10mm–90mm (≈3\/8\"–3-1\/2\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eM8 Length Range\u003c\/th\u003e\n\u003ctd\u003e12mm–120mm (≈1\/2\"–4-3\/4\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eDome (Round) — smooth, tamper-resistant\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eDrive Style\u003c\/th\u003e\n\u003ctd\u003eNone (square neck prevents rotation; no tool needed on head)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural stainless (no coating)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1, 5, 10, 15, or 20 pieces (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTensile Strength (typical)\u003c\/th\u003e\n\u003ctd\u003e≈700 MPa (A2-70 class)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCorrosion Resistance\u003c\/th\u003e\n\u003ctd\u003eGood — suitable for outdoor and damp environments\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-note\"\u003e\n    \u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e\n    \u003cstrong\u003eSizing Note:\u003c\/strong\u003e Bolt length is measured from under the head to the tip of the thread. If you are unsure which length fits your application, contact us to confirm before ordering.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\n  \u003cdiv class=\"hdiy-faq\"\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right bolt length for my project?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eAs a general rule, add the thickness of all materials being joined, then add approximately 1–1.5× the bolt diameter for thread engagement beyond the nut. For example, joining two 10mm panels with an M6 bolt typically requires at least 30mm (≈1-3\/16\") of length. When in doubt, size up — a slightly longer bolt is easier to work with than one that's too short.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the tensile strength of A2 stainless steel carriage bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA2 stainless steel (ISO 3506 property class 70) generally has a minimum tensile strength of 700 MPa and a proof load stress of approximately 450 MPa. This makes it suitable for most structural and general-purpose fastening applications. For high-load or safety-critical uses, consult an engineer.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these carriage bolts suitable for outdoor or marine use?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA2 stainless steel offers good corrosion resistance and is typically suitable for outdoor environments including garden furniture, decking, and light marine applications. For highly aggressive saltwater or chemical environments, A4 (316) stainless steel is generally recommended instead.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat thread standard do these bolts use — metric or imperial?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese are metric fasteners following the ISO\/DIN standard. M6 bolts have a standard pitch of 1.0mm and M8 bolts have a standard pitch of 1.25mm. They are \u003cstrong\u003enot\u003c\/strong\u003e compatible with UNC\/UNF (inch) threaded holes or nuts.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDo the hex flange nuts included in this kit require a separate washer?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eNo. The hex flange nut features an integrated flange that acts as a built-in washer, distributing the clamping load over a wider surface area. This eliminates the need for a separate flat washer in most applications and helps prevent the nut from pulling through softer materials.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I install a carriage bolt correctly?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eDrill a hole matching the bolt diameter through your material. Insert the carriage bolt from the front — the domed head sits flush on the surface. The square shank under the head bites into the material to prevent rotation. Thread the hex flange nut from the back and tighten with a wrench. No tool is needed on the bolt head side.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use these bolts with wood, metal, or plastic?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eYes. Carriage bolts are commonly used with wood (decking, furniture, framing), thin metal sheet, and rigid plastics. The square neck anti-rotation feature works best in wood or soft materials. For metal applications, a square hole or a separate anti-rotation method may be needed.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your \u003cstrong\u003esize and quantity\u003c\/strong\u003e above, then add to cart — ships from our US warehouse.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M6 \/ 10mm \/ 1PCS","offer_id":52308672676114,"sku":"GLFBLFFGLFBLFFDZ51474x1","price":6.69,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 12mm \/ 1PCS","offer_id":52308672708882,"sku":"GLFBLFFGLFBLFFDZ51475x1","price":6.69,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 16mm \/ 1PCS","offer_id":52308672741650,"sku":"GLFBLFFGLFBLFFDZ51476x1","price":6.72,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 20mm \/ 1PCS","offer_id":52308672774418,"sku":"GLFBLFFGLFBLFFDZ51477x1","price":6.75,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 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For example, joining two 20mm (≈3\/4\\u2033) boards with an M8 bolt would typically call for a 50mm (≈2\\u2033) bolt. When in doubt, size up.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does A2-70 mean and how strong are these bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A2 refers to the austenitic stainless steel grade (equivalent to 304 SS), and 70 indicates a minimum tensile strength of 700 MPa. This makes them suitable for most structural and general-purpose fastening applications where corrosion resistance is also required.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can these carriage bolts be used outdoors or in wet environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. A2 stainless steel offers good resistance to rust and atmospheric corrosion, making these bolts generally suitable for outdoor, marine-adjacent, and humid environments. For highly aggressive saltwater or chemical environments, A4 (316 SS) grade is typically recommended instead.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What thread standard do these carriage bolts use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These bolts use standard ISO metric coarse threads (DIN 603 \/ ISO 8677 profile). M8 bolts have a 1.25mm pitch, M10 have a 1.5mm pitch, and M12 have a 1.75mm pitch. They are compatible with standard metric hex nuts and washers of the same diameter.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do I need a special tool to install a carriage bolt?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"No special tools are required. The square neck under the domed head is designed to bite into wood or soft material as you tighten the nut, preventing the bolt from spinning. Simply push the bolt through the pre-drilled hole and tighten the nut from the other side with a standard wrench or socket.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Which size should I choose — M8, M10, or M12?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"M8 (≈5\/16\\u2033) is generally used for lighter structural connections and furniture. M10 (≈3\/8\\u2033) suits medium-duty framing, gates, and brackets. M12 (≈1\/2\\u2033) is typically chosen for heavy-duty structural work, decking, and load-bearing joints. Always verify the load requirements of your specific application.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these bolts with metal, not just wood?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Carriage bolts are primarily designed for wood-to-wood or wood-to-metal connections where the square neck locks into the material. For metal-to-metal connections, the square neck may not grip properly — in that case, a hex bolt or socket cap screw is generally more appropriate.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eM8 M10 M12 Carriage Bolts — Secure, Rust-Resistant Fastening for Wood \u0026amp; Structural Projects\u003c\/h2\u003e\n    \u003cp\u003eWhether you're building a backyard deck, assembling a timber frame, or reinforcing a gate, loose or corroded fasteners can compromise the entire structure. These A2-70 stainless steel carriage bolts are built for DIYers, contractors, and woodworkers who need a reliable, corrosion-resistant connection that holds up over time — without constant maintenance.\u003c\/p\u003e\n    \u003cp\u003eEach bolt features a smooth domed head with a square neck shank, machined to ISO metric coarse thread standards. Available in three diameters — M8, M10, and M12 — with lengths ranging from 12mm (≈1\/2\") up to 120mm (≈4-3\/4\"). Sold individually or in multi-packs of 3, 5, 10, or 15 pieces so you can order exactly what your project requires.\u003c\/p\u003e\n    \u003cp\u003eTypical applications include wood deck construction with carriage bolt fasteners, timber pergola and fence post assembly, outdoor furniture framing, and structural bracket connections where a flush, tamper-resistant head is needed on the visible face.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e\n    \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Fits standard ISO metric hex nuts and flat washers — M8, M10, or M12 as selected. Thread pitch follows DIN 603 coarse thread specification (M8 × 1.25mm, M10 × 1.5mm, M12 × 1.75mm). Designed for wood-to-wood and wood-to-metal connections.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-note\"\u003e\n    \u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e\n    \u003cstrong\u003eSizing note:\u003c\/strong\u003e Please confirm the total material thickness and required thread engagement before ordering. If you are unsure which length is right for your application, contact us to confirm before purchase.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e✅ Key Features of These M8 M10 M12 Stainless Steel Carriage Bolts\u003c\/h2\u003e\n  \u003cul class=\"hdiy-features\"\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eA2-70 Stainless Steel Construction\u003c\/strong\u003e — Made from austenitic 304-equivalent stainless steel with a minimum tensile strength of 700 MPa, offering solid resistance to rust, oxidation, and atmospheric corrosion for long-lasting outdoor use.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔘\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eCup Square Domed Head Design\u003c\/strong\u003e — The smooth, rounded head sits flush and tamper-resistant on the visible face of your workpiece, while the square neck locks into wood to prevent spinning during installation — no wrench needed on the bolt side.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eWide Size Range for Every Application\u003c\/strong\u003e — Choose from M8, M10, or M12 diameter with lengths from 12mm (≈1\/2\") to 120mm (≈4-3\/4\"), covering light furniture assembly through heavy-duty structural timber connections.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eISO Metric Coarse Thread Standard\u003c\/strong\u003e — Machined to DIN 603 specification, these carriage bolts are compatible with any standard metric hex nut and washer, making them easy to source matching hardware at any hardware store.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e — Available in 1, 3, 5, 10, or 15-piece packs so you can match your order to your exact project needs — whether it's a single repair or a full deck build requiring stainless carriage bolts in bulk.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏗️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eVersatile Structural Fastener\u003c\/strong\u003e — Suited for deck framing, pergola construction, fence post connections, outdoor furniture, and any application where a clean, domed head finish and reliable clamping force are required.\u003c\/span\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003e📐 Technical Specifications — Stainless Steel Carriage Bolts M8 M10 M12\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eCarriage Bolt (Cup Square Domed Head)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eStandard\u003c\/th\u003e\n\u003ctd\u003eDIN 603 \/ ISO 8677\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eA2-70 Stainless Steel (304 equivalent)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Diameters\u003c\/th\u003e\n\u003ctd\u003eM8, M10, M12\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Pitch\u003c\/th\u003e\n\u003ctd\u003eM8 × 1.25mm | M10 × 1.5mm | M12 × 1.75mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003eM8: 12–120mm (≈1\/2\"–4-3\/4\") | M10: 16–100mm (≈5\/8\"–4\") | M12: 25–100mm (≈1\"–4\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eDomed (round) with square neck shank\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eDrive Style\u003c\/th\u003e\n\u003ctd\u003eNo drive — nut-tightened from opposite side\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTensile Strength\u003c\/th\u003e\n\u003ctd\u003e700 MPa minimum (A2-70 grade)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural stainless (no coating)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePack Quantities\u003c\/th\u003e\n\u003ctd\u003e1 \/ 3 \/ 5 \/ 10 \/ 15 pieces (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCompatible Hardware\u003c\/th\u003e\n\u003ctd\u003eStandard ISO metric hex nuts \u0026amp; flat washers (same diameter)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eRecommended Use\u003c\/th\u003e\n\u003ctd\u003eWood-to-wood, wood-to-metal structural connections\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-faq\"\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right length for my carriage bolt?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eGenerally, the bolt length should equal the total thickness of all materials being joined plus enough thread engagement for the nut — typically at least 1× the bolt diameter. For example, joining two 20mm (≈3\/4\") boards with an M8 bolt would typically call for a 50mm (≈2\") bolt. When in doubt, size up.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat does A2-70 mean and how strong are these bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA2 refers to the austenitic stainless steel grade (equivalent to 304 SS), and 70 indicates a minimum tensile strength of 700 MPa. This makes them suitable for most structural and general-purpose fastening applications where corrosion resistance is also required.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan these carriage bolts be used outdoors or in wet environments?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eYes. A2 stainless steel offers good resistance to rust and atmospheric corrosion, making these bolts generally suitable for outdoor, marine-adjacent, and humid environments. For highly aggressive saltwater or chemical environments, A4 (316 SS) grade is typically recommended instead.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat thread standard do these carriage bolts use?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese bolts use standard ISO metric coarse threads (DIN 603 \/ ISO 8677 profile). M8 bolts have a 1.25mm pitch, M10 have a 1.5mm pitch, and M12 have a 1.75mm pitch. They are compatible with standard metric hex nuts and washers of the same diameter.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDo I need a special tool to install a carriage bolt?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eNo special tools are required. The square neck under the domed head is designed to bite into wood or soft material as you tighten the nut, preventing the bolt from spinning. Simply push the bolt through the pre-drilled hole and tighten the nut from the other side with a standard wrench or socket.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhich size should I choose — M8, M10, or M12?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eM8 (≈5\/16\") is generally used for lighter structural connections and furniture. M10 (≈3\/8\") suits medium-duty framing, gates, and brackets. M12 (≈1\/2\") is typically chosen for heavy-duty structural work, decking, and load-bearing joints. Always verify the load requirements of your specific application.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use these bolts with metal, not just wood?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eCarriage bolts are primarily designed for wood-to-wood or wood-to-metal connections where the square neck locks into the material. For metal-to-metal connections, the square neck may not grip properly — in that case, a hex bolt or socket cap screw is generally more appropriate.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your size and quantity above, then add to cart — ships from our US warehouse.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M8 \/ 12mm \/ 1PCS","offer_id":52308677132562,"sku":"GLFBLFFBRTQJD018784x1","price":6.05,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 16mm \/ 1PCS","offer_id":52308677165330,"sku":"GLFBLFFBRTQJD018785x1","price":6.05,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 20mm \/ 1PCS","offer_id":52308677198098,"sku":"GLFBLFFBRTQJD018786x1","price":6.11,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 25mm \/ 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1PCS","offer_id":52308677460242,"sku":"GLFBLFFBRTQJD018794x1","price":6.79,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 70mm \/ 1PCS","offer_id":52308677493010,"sku":"GLFBLFFBRTQJD018795x1","price":6.65,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 80mm \/ 1PCS","offer_id":52308677525778,"sku":"GLFBLFFBRTQJD018796x1","price":6.79,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 90mm \/ 5PCS","offer_id":52308677558546,"sku":"GLFBLFFGLFBLFFDZLF1724x1","price":24.87,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 100mm \/ 5PCS","offer_id":52308677591314,"sku":"GLFBLFFGLFBLFFDZLF1725x1","price":27.46,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 110mm \/ 5PCS","offer_id":52308677624082,"sku":"GLFBLFFGLFBLFFDZLF1726x1","price":33.25,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 120mm \/ 5PCS","offer_id":52308677656850,"sku":"GLFBLFFGLFBLFFDZLF1727x1","price":48.13,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 16mm \/ 5PCS","offer_id":52308677689618,"sku":"GLFBLFFGLFBLFFDZLF1728x1","price":9.51,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 20mm \/ 1PCS","offer_id":52308677722386,"sku":"GLFBLFFBRTQJD018797x1","price":6.38,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 25mm \/ 3PCS","offer_id":52308677755154,"sku":"GLFBLFFGLFBLFFDZLF1729x1","price":11.82,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 25mm \/ 1PCS","offer_id":52308677787922,"sku":"GLFBLFFBRTQJD018798x1","price":6.46,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 30mm \/ 1PCS","offer_id":52308677820690,"sku":"GLFBLFFBRTQJD018799x1","price":6.51,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 35mm \/ 1PCS","offer_id":52308677853458,"sku":"GLFBLFFBRTQJD018800x1","price":6.6,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 40mm \/ 1PCS","offer_id":52308677886226,"sku":"GLFBLFFBRTQJD018801x1","price":6.65,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 45mm \/ 1PCS","offer_id":52308677918994,"sku":"GLFBLFFBRTQJD018802x1","price":6.73,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 50mm \/ 1PCS","offer_id":52308677951762,"sku":"GLFBLFFBRTQJD018803x1","price":6.92,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 55mm \/ 1PCS","offer_id":52308677984530,"sku":"GLFBLFFBRTQJD018804x1","price":7.28,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 60mm \/ 1PCS","offer_id":52308678017298,"sku":"GLFBLFFBRTQJD018805x1","price":7.6,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 70mm \/ 1PCS","offer_id":52308678050066,"sku":"GLFBLFFBRTQJD018806x1","price":8.36,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 80mm \/ 1PCS","offer_id":52308678082834,"sku":"GLFBLFFBRTQJD018807x1","price":9.18,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 90mm \/ 1PCS","offer_id":52308678115602,"sku":"GLFBLFFBRTQJD018808x1","price":10.0,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 100mm \/ 1PCS","offer_id":52308678148370,"sku":"GLFBLFFBRTQJD018809x1","price":10.73,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 30mm \/ 1PCS","offer_id":52308678181138,"sku":"GLFBLFFBRTQJD018810x1","price":7.74,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 35mm \/ 1PCS","offer_id":52308678213906,"sku":"GLFBLFFBRTQJD018811x1","price":8.28,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 40mm \/ 1PCS","offer_id":52308678246674,"sku":"GLFBLFFBRTQJD018812x1","price":8.77,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 45mm \/ 1PCS","offer_id":52308678279442,"sku":"GLFBLFFBRTQJD018813x1","price":9.37,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 50mm \/ 1PCS","offer_id":52308678312210,"sku":"GLFBLFFBRTQJD018814x1","price":9.91,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 55mm \/ 1PCS","offer_id":52308678344978,"sku":"GLFBLFFBRTQJD018815x1","price":10.4,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 60mm \/ 1PCS","offer_id":52308678377746,"sku":"GLFBLFFBRTQJD018816x1","price":10.95,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 70mm \/ 1PCS","offer_id":52308678410514,"sku":"GLFBLFFBRTQJD018817x1","price":12.09,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 80mm \/ 1PCS","offer_id":52308678443282,"sku":"GLFBLFFBRTQJD018818x1","price":13.12,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 90mm \/ 1PCS","offer_id":52308678476050,"sku":"GLFBLFFBRTQJD018819x1","price":14.08,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 100mm \/ 1PCS","offer_id":52308678508818,"sku":"GLFBLFFBRTQJD018820x1","price":15.16,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 12mm \/ 5PCS","offer_id":52308678541586,"sku":"GLFBLFFBRTQJD018784x5","price":8.01,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 16mm \/ 5PCS","offer_id":52308678574354,"sku":"GLFBLFFBRTQJD018785x5","price":8.96,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 20mm \/ 5PCS","offer_id":52308678607122,"sku":"GLFBLFFBRTQJD018786x5","price":9.86,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 25mm \/ 5PCS","offer_id":52308678639890,"sku":"GLFBLFFBRTQJD018787x5","price":11.0,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 30mm \/ 5PCS","offer_id":52308678672658,"sku":"GLFBLFFBRTQJD018788x5","price":12.09,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 35mm \/ 5PCS","offer_id":52308678705426,"sku":"GLFBLFFBRTQJD018789x5","price":13.26,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 40mm \/ 5PCS","offer_id":52308678738194,"sku":"GLFBLFFBRTQJD018790x5","price":14.4,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 45mm \/ 5PCS","offer_id":52308678770962,"sku":"GLFBLFFBRTQJD018791x5","price":15.44,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 50mm \/ 5PCS","offer_id":52308678803730,"sku":"GLFBLFFBRTQJD018792x5","price":16.52,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 55mm \/ 5PCS","offer_id":52308678836498,"sku":"GLFBLFFBRTQJD018793x5","price":17.8,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 60mm \/ 5PCS","offer_id":52308678869266,"sku":"GLFBLFFBRTQJD018794x5","price":20.79,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 70mm \/ 5PCS","offer_id":52308678902034,"sku":"GLFBLFFBRTQJD018795x5","price":21.75,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 80mm \/ 5PCS","offer_id":52308678934802,"sku":"GLFBLFFBRTQJD018796x5","price":24.6,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 20mm \/ 5PCS","offer_id":52308678967570,"sku":"GLFBLFFBRTQJD018797x5","price":15.44,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 25mm \/ 5PCS","offer_id":52308679000338,"sku":"GLFBLFFBRTQJD018798x5","price":17.2,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 30mm \/ 5PCS","offer_id":52308679033106,"sku":"GLFBLFFBRTQJD018799x5","price":18.84,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 35mm \/ 5PCS","offer_id":52308679065874,"sku":"GLFBLFFBRTQJD018800x5","price":20.74,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 40mm \/ 5PCS","offer_id":52308679098642,"sku":"GLFBLFFBRTQJD018801x5","price":22.51,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 45mm \/ 5PCS","offer_id":52308679131410,"sku":"GLFBLFFBRTQJD018802x5","price":24.33,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 50mm \/ 5PCS","offer_id":52308679164178,"sku":"GLFBLFFBRTQJD018803x5","price":26.1,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 55mm \/ 5PCS","offer_id":52308679196946,"sku":"GLFBLFFBRTQJD018804x5","price":27.95,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 60mm \/ 5PCS","offer_id":52308679229714,"sku":"GLFBLFFBRTQJD018805x5","price":29.72,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 70mm \/ 5PCS","offer_id":52308679262482,"sku":"GLFBLFFBRTQJD018806x5","price":33.44,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 80mm \/ 5PCS","offer_id":52308679295250,"sku":"GLFBLFFBRTQJD018807x5","price":37.52,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 90mm \/ 5PCS","offer_id":52308679328018,"sku":"GLFBLFFBRTQJD018808x5","price":41.6,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 100mm \/ 5PCS","offer_id":52308679360786,"sku":"GLFBLFFBRTQJD018809x5","price":45.41,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 30mm \/ 5PCS","offer_id":52308679393554,"sku":"GLFBLFFBRTQJD018810x5","price":30.45,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 35mm \/ 5PCS","offer_id":52308679426322,"sku":"GLFBLFFBRTQJD018811x5","price":32.9,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 40mm \/ 5PCS","offer_id":52308679459090,"sku":"GLFBLFFBRTQJD018812x5","price":35.56,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 45mm \/ 5PCS","offer_id":52308679491858,"sku":"GLFBLFFBRTQJD018813x5","price":38.47,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 50mm \/ 5PCS","offer_id":52308679524626,"sku":"GLFBLFFBRTQJD018814x5","price":41.33,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 55mm \/ 5PCS","offer_id":52308679557394,"sku":"GLFBLFFBRTQJD018815x5","price":43.64,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 60mm \/ 5PCS","offer_id":52308679590162,"sku":"GLFBLFFBRTQJD018816x5","price":46.31,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 70mm \/ 5PCS","offer_id":52308679622930,"sku":"GLFBLFFBRTQJD018817x5","price":51.94,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 80mm \/ 5PCS","offer_id":52308679655698,"sku":"GLFBLFFBRTQJD018818x5","price":64.4,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 90mm \/ 5PCS","offer_id":52308679688466,"sku":"GLFBLFFBRTQJD018819x5","price":69.97,"currency_code":"USD","in_stock":true},{"title":"M12 \/ 100mm \/ 5PCS","offer_id":52308679721234,"sku":"GLFBLFFBRTQJD018820x5","price":75.87,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 12mm \/ 10PCS","offer_id":52308679754002,"sku":"GLFBLFFBRTQJD018784x10","price":13.99,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 16mm \/ 10PCS","offer_id":52308679786770,"sku":"GLFBLFFBRTQJD018785x10","price":15.76,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 20mm \/ 10PCS","offer_id":52308679819538,"sku":"GLFBLFFBRTQJD018786x10","price":17.61,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 25mm \/ 10PCS","offer_id":52308679852306,"sku":"GLFBLFFBRTQJD018787x10","price":19.84,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 30mm \/ 10PCS","offer_id":52308679885074,"sku":"GLFBLFFBRTQJD018788x10","price":22.15,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 35mm \/ 10PCS","offer_id":52308679917842,"sku":"GLFBLFFBRTQJD018789x10","price":24.41,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 40mm \/ 10PCS","offer_id":52308679950610,"sku":"GLFBLFFBRTQJD018790x10","price":26.64,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 45mm \/ 10PCS","offer_id":52308679983378,"sku":"GLFBLFFBRTQJD018791x10","price":28.82,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 50mm \/ 10PCS","offer_id":52308680016146,"sku":"GLFBLFFBRTQJD018792x10","price":30.99,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 55mm \/ 10PCS","offer_id":52308680048914,"sku":"GLFBLFFBRTQJD018793x10","price":33.52,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 60mm \/ 10PCS","offer_id":52308680081682,"sku":"GLFBLFFBRTQJD018794x10","price":39.43,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 70mm \/ 10PCS","offer_id":52308680114450,"sku":"GLFBLFFBRTQJD018795x10","price":41.47,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 80mm \/ 10PCS","offer_id":52308680147218,"sku":"GLFBLFFBRTQJD018796x10","price":47.12,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 20mm \/ 10PCS","offer_id":52308680179986,"sku":"GLFBLFFBRTQJD018797x10","price":28.68,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 25mm \/ 10PCS","offer_id":52308680212754,"sku":"GLFBLFFBRTQJD018798x10","price":32.22,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 30mm \/ 10PCS","offer_id":52308680245522,"sku":"GLFBLFFBRTQJD018799x10","price":35.62,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 35mm \/ 10PCS","offer_id":52308680278290,"sku":"GLFBLFFBRTQJD018800x10","price":39.43,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 40mm \/ 10PCS","offer_id":52308680311058,"sku":"GLFBLFFBRTQJD018801x10","price":42.91,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 45mm \/ 10PCS","offer_id":52308680343826,"sku":"GLFBLFFBRTQJD018802x10","price":46.5,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 12mm \/ 15PCS","offer_id":52308680376594,"sku":"GLFBLFFBRTQJD018784x15","price":19.92,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 16mm \/ 15PCS","offer_id":52308680409362,"sku":"GLFBLFFBRTQJD018785x15","price":22.64,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 20mm \/ 15PCS","offer_id":52308680442130,"sku":"GLFBLFFBRTQJD018786x15","price":25.36,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 25mm \/ 15PCS","offer_id":52308680474898,"sku":"GLFBLFFBRTQJD018787x15","price":28.76,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 30mm \/ 15PCS","offer_id":52308680507666,"sku":"GLFBLFFBRTQJD018788x15","price":32.16,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 35mm \/ 15PCS","offer_id":52308680540434,"sku":"GLFBLFFBRTQJD018789x15","price":35.56,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 40mm \/ 15PCS","offer_id":52308680573202,"sku":"GLFBLFFBRTQJD018790x15","price":38.96,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 45mm \/ 15PCS","offer_id":52308680605970,"sku":"GLFBLFFBRTQJD018791x15","price":42.15,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 50mm \/ 15PCS","offer_id":52308680638738,"sku":"GLFBLFFBRTQJD018792x15","price":45.41,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 55mm \/ 15PCS","offer_id":52308680671506,"sku":"GLFBLFFBRTQJD018793x15","price":49.22,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 60mm \/ 15PCS","offer_id":52308680704274,"sku":"GLFBLFFBRTQJD018794x15","price":58.14,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 70mm \/ 15PCS","offer_id":52308680737042,"sku":"GLFBLFFBRTQJD018795x15","price":69.02,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 80mm \/ 15PCS","offer_id":52308680769810,"sku":"GLFBLFFBRTQJD018796x15","price":78.4,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 20mm \/ 15PCS","offer_id":52308680802578,"sku":"GLFBLFFBRTQJD018797x15","price":42.01,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 25mm \/ 15PCS","offer_id":52308680835346,"sku":"GLFBLFFBRTQJD018798x15","price":47.31,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 30mm \/ 15PCS","offer_id":52308680868114,"sku":"GLFBLFFBRTQJD018799x15","price":52.35,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 35mm \/ 15PCS","offer_id":52308680900882,"sku":"GLFBLFFBRTQJD018800x15","price":65.54,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 40mm \/ 15PCS","offer_id":52308680933650,"sku":"GLFBLFFBRTQJD018801x15","price":71.52,"currency_code":"USD","in_stock":true},{"title":"M10 \/ 45mm \/ 15PCS","offer_id":52308680966418,"sku":"GLFBLFFBRTQJD018802x15","price":77.64,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-02_efd5a156-e9cb-4220-b0b8-45319d3f7b8a.jpg?v=1780641509"},{"product_id":"m3-m4-m5-m6-carriage-bolts-a2-stainless-steel-cup-square-domed-screws","title":"M3 M4 M5 M6 Carriage Bolts – A2-70 Stainless Steel Cup Square Domed Screws","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eM3–M6 Stainless Steel Carriage Bolts — Secure, Rust-Resistant Fastening for Wood \u0026amp; Metal\u003c\/h2\u003e\n\u003cp\u003eWhether you're building a backyard deck, assembling outdoor furniture, or reinforcing a fence panel, finding a bolt that won't back out, strip, or rust after a season outdoors is a real challenge. These A2-70 stainless steel carriage bolts are designed for DIYers, woodworkers, and contractors who need a reliable, tamper-resistant fastener that holds firm without constant maintenance.\u003c\/p\u003e\n\u003cp\u003eEach bolt features a smooth domed head with a square neck shank, machined from A2-70 grade stainless steel (equivalent to 304 SS, tensile strength ≥700 MPa). Available in thread diameters M3, M4, M5, and M6, with lengths ranging from 8mm (≈5\/16\") to 90mm (≈3-1\/2\"). Sold individually or in bulk packs of 5, 10, 20, 30, 40, 50, or 100 pieces to suit both one-off repairs and larger projects.\u003c\/p\u003e\n\u003cp\u003eTypical applications include wood-to-wood deck and pergola framing, outdoor furniture assembly, fence post connections, and light structural metalwork — anywhere you need a carriage bolt that resists corrosion and stays put. The square neck locks into timber or composite panels to prevent spinning during tightening, making single-person installation straightforward.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Fits standard ISO metric nuts and washers (M3, M4, M5, M6). Thread profile: ISO metric coarse (DIN 603 \/ ISO 8677). Not compatible with UNC\/UNF inch-thread hardware.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These Stainless Steel Carriage Bolts\u003c\/h2\u003e\n\u003cul class=\"hdiy-features\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eA2-70 Stainless Steel\u003c\/strong\u003e — Grade A2 (304 SS) with ≥700 MPa tensile strength resists rust and oxidation in outdoor and damp environments, making these carriage bolts a dependable choice for exterior wood fastening.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔒\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eAnti-Rotation Square Neck\u003c\/strong\u003e — The square shank under the domed head bites into timber and composite panels, preventing the bolt from spinning during nut tightening — no need for a second tool on the bolt side.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eWide Size Range\u003c\/strong\u003e — Covers M3 through M6 diameters and lengths from 8mm (≈5\/16\") to 90mm (≈3-1\/2\"), giving you the right cup square bolt for thin panel work up to heavy structural connections.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlexible Quantity Options\u003c\/strong\u003e — Available from single pieces to 100-packs, so you can grab exactly what you need for a quick repair or stock up for a full deck or pergola build without over-ordering.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eTool-Free Head Installation\u003c\/strong\u003e — The smooth domed head requires no driver bit — simply insert into a pre-drilled hole and tighten the nut from the back, ideal for flush-finish applications where a clean surface appearance matters.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eISO Metric Coarse Thread\u003c\/strong\u003e — Standard DIN 603 thread profile ensures compatibility with off-the-shelf metric nuts, washers, and threaded inserts, so you're never hunting for specialty hardware to complete the joint.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e📐 Technical Specifications — Carriage Bolts (Cup Square Domed Screws)\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eCarriage Bolt (Cup Square Domed Head Bolt)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eA2 Stainless Steel (304 SS equivalent)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGrade \/ Strength Class\u003c\/th\u003e\n\u003ctd\u003eA2-70 (min. tensile strength 700 MPa)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eISO Metric Coarse (DIN 603 \/ ISO 8677)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Diameters\u003c\/th\u003e\n\u003ctd\u003eM3, M4, M5, M6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e8mm (≈5\/16\") – 90mm (≈3-1\/2\") — see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eDomed (Cup Square \/ Mushroom Head)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNeck Style\u003c\/th\u003e\n\u003ctd\u003eSquare shank (anti-rotation)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural stainless (no coating)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1, 5, 10, 20, 30, 40, 50, or 100 pieces — see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCorrosion Resistance\u003c\/th\u003e\n\u003ctd\u003eGood — suitable for outdoor use in most climates; not recommended for marine\/saltwater immersion\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Fasteners\u003c\/th\u003e\n\u003ctd\u003eStandard ISO metric hex nuts and flat washers (M3–M6)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-note\"\u003e\n\u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e \u003cstrong\u003eNote:\u003c\/strong\u003e Always verify bolt length against your actual material stack-up before ordering. If you're unsure which size fits your application, contact us — we're happy to help.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right length for my carriage bolt?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eGenerally, the bolt length should equal the total thickness of all materials being joined, plus enough thread engagement for the nut — typically at least 1.5× the bolt diameter. For example, joining two 20mm (≈3\/4\") boards with an M6 bolt would typically require at least a 50mm (≈2\") bolt. When in doubt, size up to the next available length.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does A2-70 mean and how strong are these bolts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA2 refers to the austenitic stainless steel grade (equivalent to 304 stainless), and 70 indicates a minimum tensile strength of 700 MPa. This makes them suitable for general structural fastening in most indoor and moderate outdoor environments. For higher-load applications, consult an engineer to confirm suitability.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these carriage bolts suitable for outdoor or marine use?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA2 stainless steel offers good corrosion resistance and is generally suitable for outdoor use in most climates, including rain-exposed decks and garden structures. For highly corrosive environments — such as coastal or marine applications with direct saltwater exposure — A4 (316) stainless steel is typically recommended instead.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat thread standard do these carriage bolts use, and what nuts fit them?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese bolts use standard ISO metric coarse threads (DIN 603 \/ ISO 8677 profile). M3 through M6 sizes are compatible with standard metric hex nuts and flat washers of the corresponding size, available at any hardware store. They are \u003cstrong\u003enot\u003c\/strong\u003e compatible with UNC or UNF inch-thread hardware.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo I need a special tool to install carriage bolts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eNo special tools are required on the bolt side. The domed head and square shank are designed to be inserted into a pre-drilled hole — the square neck bites into the material to prevent rotation while you tighten the nut from the other side with a standard wrench or socket. Ensure the hole diameter matches the bolt shank (not the square neck) for a proper fit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhich size carriage bolt should I use for wood-to-wood connections?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eFor light-duty wood joints such as furniture or shelving, M3–M4 bolts are generally sufficient. For structural wood connections such as deck framing, pergola beams, or fence posts, M5–M6 bolts are typically recommended. Always match the bolt diameter to the pre-drilled hole size for a snug, secure fit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these bolts with metal or composite materials?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. Carriage bolts can be used with thin metal plates, composite panels, and engineered wood products. For metal applications, ensure the hole is sized to allow the square neck to seat properly — in harder materials, a square-hole punch or careful step-drilling may be needed to achieve the anti-rotation grip.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your \u003cstrong\u003esize and quantity\u003c\/strong\u003e above, then add to cart — ships from our US warehouse.\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M3 \/ 20mm \/ 50PCS","offer_id":52308681720082,"sku":"GLFBLFFGLFBLFFDZLF1716x1","price":12.09,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 30mm \/ 50PCS","offer_id":52308681752850,"sku":"GLFBLFFGLFBLFFDZLF1717x1","price":11.41,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 8mm \/ 1PCS","offer_id":52308681785618,"sku":"GLFBLFFBRTQJD023309x1","price":5.83,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 10mm \/ 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