{"product_id":"m4-carriage-bolts-g304-stainless-steel-din-603","title":"M4 Carriage Bolts – G304 Stainless Steel, DIN 603, 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 length for M4 carriage bolts?\",\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 1.5× the bolt diameter. 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":"10mm \/ 1 Pcs","offer_id":52308610810130,"sku":"DTVKA7710x1","price":3.25,"currency_code":"USD","in_stock":true},{"title":"12mm \/ 1 Pcs","offer_id":52308610842898,"sku":"DTVKA7711x1","price":3.41,"currency_code":"USD","in_stock":true},{"title":"14mm \/ 1 Pcs","offer_id":52308610875666,"sku":"DTVKA7712x1","price":3.41,"currency_code":"USD","in_stock":true},{"title":"16mm \/ 1 Pcs","offer_id":52308610908434,"sku":"DTVKA7713x1","price":3.41,"currency_code":"USD","in_stock":true},{"title":"18mm \/ 1 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