{"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 x 20mm \/ 20","offer_id":52308613071122,"sku":"XYHBRT5-364x1","price":5.43,"currency_code":"USD","in_stock":true},{"title":"M6 x 25mm \/ 20","offer_id":52308613103890,"sku":"XYHBRT5-365x1","price":6.32,"currency_code":"USD","in_stock":true},{"title":"M6 x 30mm \/ 20","offer_id":52308613136658,"sku":"XYHBRT5-366x1","price":7.06,"currency_code":"USD","in_stock":true},{"title":"M6 x 35mm \/ 20","offer_id":52308613169426,"sku":"XYHBRT5-367x1","price":7.87,"currency_code":"USD","in_stock":true},{"title":"M6 x 40mm \/ 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