{"product_id":"m6-m8-carriage-bolts-steel-zinc-plated-din-603","title":"M6 M8 Carriage Bolts Steel Zinc Plated – DIN 603 Cup Head Square Neck 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 length for my carriage bolt?\",\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× the bolt diameter. For example, joining two 6mm (1\/4\\u2033) boards with an M6 bolt, a 12mm (1\/2\\u2033) or 16mm (5\/8\\u2033) length is typically sufficient. Always measure your stack-up before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the shear and tensile strength of these carriage bolts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These bolts are manufactured to DIN 603 standards and are generally rated at property class 4.6, which typically provides a tensile strength of around 400 MPa and a yield strength of around 240 MPa. For structural or load-bearing applications, please verify the exact grade with us before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these carriage bolts suitable for outdoor or wet environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The zinc plating provides moderate corrosion resistance suitable for indoor and sheltered outdoor use. For prolonged direct exposure to rain, salt spray, or high humidity, a stainless steel or hot-dip galvanized option is generally recommended.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What thread standard do these bolts use — are they compatible with standard metric nuts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. These bolts use standard ISO metric coarse threads (M6×1.0mm pitch and M8×1.25mm pitch) and are compatible with any standard DIN 934 or ISO 4032 metric hex nuts of the matching size.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How does the square neck work and why does it matter?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The square neck sits directly under the round cup head. When driven into a pre-drilled square hole or soft material like wood, the neck bites in and prevents the bolt from spinning while you tighten the nut from the other side — no wrench needed on the bolt head.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many pieces should I order for my project?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"We offer quantities of 1, 5, 10, 20, 50, and 100 pieces per size. For small repairs or prototyping, 1–5 pcs is typically enough. For deck building, fencing, or furniture projects, ordering 20–100 pcs generally offers better per-unit value.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these bolts with metal or only with wood?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"DIN 603 carriage bolts are most commonly used with wood, but they can also be used with thin metal plates when a pre-drilled square hole or a square-hole washer is used to prevent rotation. For heavy steel-to-steel connections, a hex bolt is generally a better choice.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eM6 M8 Carriage Bolts Zinc Plated — Reliable DIN 603 Fasteners for Wood \u0026amp; Light Metal\u003c\/h2\u003e\n    \u003cp\u003eWhether you're building a backyard deck, assembling outdoor furniture, or reinforcing a fence post, finding a fastener that stays put without spinning is half the battle. DIYers and contractors alike need a bolt that seats itself firmly so one person can tighten the nut solo — that's exactly what these zinc-plated M6 M8 carriage bolts are designed to do.\u003c\/p\u003e\n    \u003cp\u003eEach bolt is manufactured to the \u003cstrong\u003eDIN 603\u003c\/strong\u003e standard and features a smooth round cup head with a square neck shank. Available in \u003cstrong\u003eM6 (6mm) and M8 (8mm)\u003c\/strong\u003e diameters with lengths ranging from \u003cstrong\u003e12mm (≈1\/2\") to 25mm (≈1\")\u003c\/strong\u003e. Thread pitches are \u003cstrong\u003e1.0mm for M6\u003c\/strong\u003e and \u003cstrong\u003e1.25mm for M8\u003c\/strong\u003e, matching standard ISO metric coarse thread. The steel body is finished with a zinc plating layer for corrosion resistance in typical indoor and sheltered outdoor conditions. Order in quantities of 1, 5, 10, 20, 50, or 100 pieces to match your project scale.\u003c\/p\u003e\n    \u003cp\u003eThese carriage bolts are a go-to choice for \u003cstrong\u003ewood deck construction\u003c\/strong\u003e, \u003cstrong\u003etimber frame joinery\u003c\/strong\u003e, and \u003cstrong\u003eDIY furniture assembly\u003c\/strong\u003e — anywhere you need a flush, snag-free bolt head on the visible face of the workpiece. The square neck locks into softwood or a pre-drilled square hole in metal, making single-handed installation straightforward.\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 ISO metric hex nuts — M6 (DIN 934, 1.0mm pitch) and M8 (DIN 934, 1.25mm pitch). Designed for use with wood, plywood, and light-gauge metal with a pre-drilled square hole or square-hole washer.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e✅ Key Features of These M6 M8 Zinc-Plated 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\u003eDIN 603 Cup Head Design\u003c\/strong\u003e — The smooth, domed round head sits flush and snag-free on the surface, making it ideal for carriage bolt wood deck applications where appearance and safety matter.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔲\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eAnti-Spin Square Neck\u003c\/strong\u003e — The square shoulder under the head bites into wood or a matching square hole, locking the bolt in place so you can tighten the nut without holding the head — a key advantage for single-person installation.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eZinc-Plated Steel Body\u003c\/strong\u003e — The electroplated zinc finish provides a protective barrier against oxidation and light moisture, extending service life in sheltered outdoor and indoor environments.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003ePrecise ISO Metric Threading\u003c\/strong\u003e — M6×1.0mm and M8×1.25mm coarse threads are cut to standard tolerances, ensuring smooth engagement with any compatible metric hex nut for carriage bolt and nut assemblies.\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 — Choose from 1 to 100 pieces per size so you can buy exactly what your project needs — from a single replacement bolt to a bulk pack for large-scale timber framing or fencing projects.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eMultiple Size Combinations\u003c\/strong\u003e — Five size variants (M6×12, M6×16, M8×16, M8×20, M8×25) cover the most common fastening depths, reducing the need to stock multiple bolt types for typical DIY and light construction work.\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\u003eRound cup head (mushroom head)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eNeck Style\u003c\/th\u003e\n\u003ctd\u003eSquare neck (anti-rotation)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eCarbon steel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eZinc plated (electroplated)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Type\u003c\/th\u003e\n\u003ctd\u003eISO metric coarse thread\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Diameters\u003c\/th\u003e\n\u003ctd\u003eM6 (6mm \/ ≈1\/4\"), M8 (8mm \/ ≈5\/16\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Pitch — M6\u003c\/th\u003e\n\u003ctd\u003e1.0mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Pitch — M8\u003c\/th\u003e\n\u003ctd\u003e1.25mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e12mm (≈1\/2\"), 16mm (≈5\/8\"), 20mm (≈3\/4\"), 25mm (≈1\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eM6 Length Options\u003c\/th\u003e\n\u003ctd\u003eM6×12, M6×16\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eM8 Length Options\u003c\/th\u003e\n\u003ctd\u003eM8×16, M8×20, M8×25\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eProperty Class\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eNut Compatibility\u003c\/th\u003e\n\u003ctd\u003eStandard ISO metric hex nut (DIN 934)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eQuantity Options\u003c\/th\u003e\n\u003ctd\u003e1, 5, 10, 20, 50, 100 pcs\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-faq\"\u003e\n    \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\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, 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× the bolt diameter. For example, joining two 6mm (1\/4\") boards with an M6 bolt, a 12mm (1\/2\") or 16mm (5\/8\") length is typically sufficient. Always measure your stack-up before ordering.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the shear and tensile strength of these carriage bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese bolts are manufactured to DIN 603 standards and are generally rated at property class 4.6, which typically provides a tensile strength of around 400 MPa and a yield strength of around 240 MPa. For structural or load-bearing applications, please verify the exact grade with us before ordering.\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 wet environments?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThe zinc plating provides moderate corrosion resistance suitable for indoor and sheltered outdoor use. For prolonged direct exposure to rain, salt spray, or high humidity, a stainless steel or hot-dip galvanized option is generally recommended.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat thread standard do these bolts 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 (M6×1.0mm pitch and M8×1.25mm pitch) and are compatible with any standard DIN 934 or ISO 4032 metric hex nuts of the matching size.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow does the square neck work and why does it matter?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThe square neck sits directly under the round cup head. When driven into a pre-drilled square hole or soft material like wood, the neck bites in and prevents the bolt from spinning while you tighten the nut from the other side — no wrench needed on the bolt head.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow many pieces should I order for my project?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eWe offer quantities of 1, 5, 10, 20, 50, and 100 pieces per size. For small repairs or prototyping, 1–5 pcs is typically enough. For deck building, fencing, or furniture projects, ordering 20–100 pcs generally offers better per-unit value.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use these bolts with metal or only with wood?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eDIN 603 carriage bolts are most commonly used with wood, but they can also be used with thin metal plates when a pre-drilled square hole or a square-hole washer is used to prevent rotation. For heavy steel-to-steel connections, a hex bolt is generally a better choice.\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":"M6x12 \/ 1.0mm \/ 1","offer_id":52308643053842,"sku":"GYLZWMGBRT26223x1","price":1.46,"currency_code":"USD","in_stock":true},{"title":"M6x16 \/ 1.0mm \/ 1","offer_id":52308643086610,"sku":"GYLZWMGBRT26224x1","price":1.46,"currency_code":"USD","in_stock":true},{"title":"M8x16 \/ 1.25mm \/ 1","offer_id":52308643119378,"sku":"GYLZWMGBRT26225x1","price":1.46,"currency_code":"USD","in_stock":true},{"title":"M8x20 \/ 1.25mm \/ 1","offer_id":52308643152146,"sku":"GYLZWMGBRT26226x1","price":1.46,"currency_code":"USD","in_stock":true},{"title":"M8x25 \/ 1.25mm \/ 1","offer_id":52308643184914,"sku":"GYLZWMGBRT26227x1","price":1.46,"currency_code":"USD","in_stock":true},{"title":"M6x12 \/ 1.0mm \/ 5","offer_id":52308643217682,"sku":"GYLZWMGBRT26223x5","price":1.6,"currency_code":"USD","in_stock":true},{"title":"M6x16 \/ 1.0mm \/ 5","offer_id":52308643250450,"sku":"GYLZWMGBRT26224x5","price":1.69,"currency_code":"USD","in_stock":true},{"title":"M8x16 \/ 1.25mm \/ 5","offer_id":52308643283218,"sku":"GYLZWMGBRT26225x5","price":2.72,"currency_code":"USD","in_stock":true},{"title":"M8x20 \/ 1.25mm \/ 5","offer_id":52308643315986,"sku":"GYLZWMGBRT26226x5","price":3.01,"currency_code":"USD","in_stock":true},{"title":"M8x25 \/ 1.25mm \/ 5","offer_id":52308643348754,"sku":"GYLZWMGBRT26227x5","price":3.22,"currency_code":"USD","in_stock":true},{"title":"M6x12 \/ 1.0mm \/ 10","offer_id":52308643381522,"sku":"GYLZWMGBRT26223x10","price":2.42,"currency_code":"USD","in_stock":true},{"title":"M6x16 \/ 1.0mm \/ 10","offer_id":52308643414290,"sku":"GYLZWMGBRT26224x10","price":2.62,"currency_code":"USD","in_stock":true},{"title":"M8x16 \/ 1.25mm \/ 10","offer_id":52308643447058,"sku":"GYLZWMGBRT26225x10","price":5.71,"currency_code":"USD","in_stock":true},{"title":"M8x20 \/ 1.25mm \/ 10","offer_id":52308643479826,"sku":"GYLZWMGBRT26226x10","price":6.54,"currency_code":"USD","in_stock":true},{"title":"M8x25 \/ 1.25mm \/ 10","offer_id":52308643512594,"sku":"GYLZWMGBRT26227x10","price":6.98,"currency_code":"USD","in_stock":true},{"title":"M6x12 \/ 1.0mm \/ 20","offer_id":52308643545362,"sku":"GYLZWMGBRT26223x20","price":5.07,"currency_code":"USD","in_stock":true},{"title":"M6x16 \/ 1.0mm \/ 20","offer_id":52308643578130,"sku":"GYLZWMGBRT26224x20","price":5.66,"currency_code":"USD","in_stock":true},{"title":"M8x16 \/ 1.25mm \/ 20","offer_id":52308643610898,"sku":"GYLZWMGBRT26225x20","price":10.65,"currency_code":"USD","in_stock":true},{"title":"M8x20 \/ 1.25mm \/ 20","offer_id":52308643643666,"sku":"GYLZWMGBRT26226x20","price":12.17,"currency_code":"USD","in_stock":true},{"title":"M8x25 \/ 1.25mm \/ 20","offer_id":52308643676434,"sku":"GYLZWMGBRT26227x20","price":13.15,"currency_code":"USD","in_stock":true},{"title":"M6x12 \/ 1.0mm \/ 50","offer_id":52308643709202,"sku":"GYLZWMGBRT26223x50","price":11.3,"currency_code":"USD","in_stock":true},{"title":"M6x16 \/ 1.0mm \/ 50","offer_id":52308643741970,"sku":"GYLZWMGBRT26224x50","price":12.77,"currency_code":"USD","in_stock":true},{"title":"M8x16 \/ 1.25mm \/ 50","offer_id":52308643774738,"sku":"GYLZWMGBRT26225x50","price":25.39,"currency_code":"USD","in_stock":true},{"title":"M8x20 \/ 1.25mm \/ 50","offer_id":52308643807506,"sku":"GYLZWMGBRT26226x50","price":29.21,"currency_code":"USD","in_stock":true},{"title":"M8x25 \/ 1.25mm \/ 50","offer_id":52308643840274,"sku":"GYLZWMGBRT26227x50","price":31.57,"currency_code":"USD","in_stock":true},{"title":"M6x12 \/ 1.0mm \/ 100","offer_id":52308643873042,"sku":"GYLZWMGBRT26223x100","price":21.81,"currency_code":"USD","in_stock":true},{"title":"M6x16 \/ 1.0mm \/ 100","offer_id":52308643905810,"sku":"GYLZWMGBRT26224x100","price":24.75,"currency_code":"USD","in_stock":true},{"title":"M8x16 \/ 1.25mm \/ 100","offer_id":52308643938578,"sku":"GYLZWMGBRT26225x100","price":40.46,"currency_code":"USD","in_stock":true},{"title":"M8x20 \/ 1.25mm \/ 100","offer_id":52308643971346,"sku":"GYLZWMGBRT26226x100","price":46.69,"currency_code":"USD","in_stock":true},{"title":"M8x25 \/ 1.25mm \/ 100","offer_id":52308644004114,"sku":"GYLZWMGBRT26227x100","price":50.51,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/6f6ca16d-6bac-4257-9064-3b5c4dc56d08.jpg?v=1780639921","url":"https:\/\/homediyer.com\/de\/products\/m6-m8-carriage-bolts-steel-zinc-plated-din-603","provider":"HomeDIYer","version":"1.0","type":"link"}