{"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 \/ 50 Pcs","offer_id":52308596687122,"sku":"WBJHHZUV003LS001x1","price":9.04,"currency_code":"USD","in_stock":true},{"title":"M3 × 10mm \/ 50 Pcs","offer_id":52308596719890,"sku":"WBJHHZUV003LS002x1","price":9.32,"currency_code":"USD","in_stock":true},{"title":"M3 × 12mm \/ 50 Pcs","offer_id":52308596752658,"sku":"WBJHHZUV003LS003x1","price":9.79,"currency_code":"USD","in_stock":true},{"title":"M3 × 16mm \/ 50 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