{"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 \/ 5 PCS","offer_id":52308590821650,"sku":"AdaahSZBRT17573x5","price":2.3,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 8mm \/ 10 PCS","offer_id":52308590854418,"sku":"AdaahSZBRT17573x10","price":2.43,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 8mm \/ 20 PCS","offer_id":52308590887186,"sku":"AdaahSZBRT17573x20","price":2.72,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 8mm \/ 50 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