{"product_id":"m6-carriage-bolts-a2-70-stainless-steel-coach-screws","title":"M6 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\": \"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 \u0026 6mm \/ 25mm \/ 50PCS\u0026BOX","offer_id":52308509098258,"sku":"KAYFST029-1","price":11.72,"currency_code":"USD","in_stock":true},{"title":"M6 \u0026 6mm \/ 30mm \/ 50PCS\u0026BOX","offer_id":52308509131026,"sku":"KAYFST029-2","price":12.06,"currency_code":"USD","in_stock":true},{"title":"M6 \u0026 6mm \/ 35mm \/ 50PCS\u0026BOX","offer_id":52308509163794,"sku":"KAYFST029-3","price":12.58,"currency_code":"USD","in_stock":true},{"title":"M6 \u0026 6mm \/ 40mm \/ 40PCS\u0026BOX","offer_id":52308509196562,"sku":"KAYFST029-4","price":11.83,"currency_code":"USD","in_stock":true},{"title":"M6 \u0026 6mm \/ 50mm \/ 30PCS\u0026BOX","offer_id":52308509229330,"sku":"KAYFST029-5","price":11.79,"currency_code":"USD","in_stock":true},{"title":"M6 \u0026 6mm \/ 60mm \/ 25PCS\u0026BOX","offer_id":52308509262098,"sku":"KAYFST029-6","price":11.38,"currency_code":"USD","in_stock":true},{"title":"M6 \u0026 6mm \/ 70mm \/ 25PCS\u0026BOX","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","url":"https:\/\/homediyer.com\/de\/products\/m6-carriage-bolts-a2-70-stainless-steel-coach-screws","provider":"HomeDIYer","version":"1.0","type":"link"}