{"product_id":"m20-x-220mm-coach-bolt-carriage-bolt-amp-nut-bzp-grade-4-8-steel-din-603","title":"M20 x 220mm Coach Bolt (Carriage Bolt) \u0026 Nut, BZP, Grade 4.8 Steel, DIN 603","description":"\u003ch2\u003e\n\u003cstrong\u003eM20 Coach Bolt\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h2\u003e\n\u003cp\u003eCarriage bolt with a smooth head, no drive recess for security, and a square neck beneath the head that prevents rotation when tightened from the back.\u003c\/p\u003e\n\u003cp\u003eThe square neck under the rounded head locks into wood or metal. This prevents rotation during installation which allows easy one-sided fastening.\u003c\/p\u003e\n\u003cp\u003eThe smooth round head allows for a clean finish and with no drive recess restricts the bolt from being removed or tampered with without clear access to the back.\u003c\/p\u003e\n\u003cp\u003eThis adds an element of security to applications where disassembly should be restricted. A combination that sees these coach bolts widely used and being manufactured from A2 stainless steel makes them versatile for both internal and external uses.\u003c\/p\u003e\n\u003cp\u003eKnown in the trade as carriage bolts, coach bolts, cup square carriage bolts, and used by DIY enthusiasts and professionals alike.\u003c\/p\u003e\n\u003ch3\u003e\n\u003cstrong\u003eM20 Coach Bolt Specification\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDiameter\u003cstrong\u003e (TD): \u003c\/strong\u003eM20 - 20mm\u003c\/li\u003e\n\u003cli\u003eNeck width \u003cstrong\u003e(NW): \u003c\/strong\u003e20.8mm max\u003c\/li\u003e\n\u003cli\u003eNeck depth\u003cstrong\u003e (ND):\u003c\/strong\u003e 15.9mm max\u003c\/li\u003e\n\u003cli\u003eLength \u003cstrong\u003e(L):\u003c\/strong\u003e 220mm\u003c\/li\u003e\n\u003cli\u003eThread length\u003cstrong\u003e (TL): \u003c\/strong\u003e150mm Approx.\u003c\/li\u003e\n\u003cli\u003eHead width \u003cstrong\u003e(HW): \u003c\/strong\u003e46.8mm max\u003c\/li\u003e\n\u003cli\u003eDome head height \u003cstrong\u003e(HH): \u003c\/strong\u003e11mm max\u003c\/li\u003e\n\u003cli\u003eMaterial: Mild steel grade 4.8\u003c\/li\u003e\n\u003cli\u003eFinish: (BZP) Bright zinc plated\u003c\/li\u003e\n\u003cli\u003eSupplied with the correct nut\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe M20 coach bolt is part of a larger range of \u003ca href=\"https:\/\/www.fusionfixings.co.uk\/collections\/metric-bzp-carriage-bolts\" rel=\"noopener\" target=\"_blank\"\u003ecoach bolts (carriage bolts) \u003c\/a\u003eavailable at competitive prices with bulk price discounts.\u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003e\n\u003cstrong\u003eCoach bolts (carriage bolts) with increased corrosion resistance!\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h3\u003e\n\u003cp\u003eDo you need coach bolts (carriage bolts) with increased resistance to corrosion? If so, take a look at the range of \u003ca rel=\"noopener\" href=\"https:\/\/www.fusionfixings.co.uk\/collections\/carriage-bolts-metric-a2-stainless-steel\" target=\"_blank\"\u003eA2 stainless steel coach bolts (carriage bolts).\u003c\/a\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003e\n\u003cstrong\u003eFAQs about Coach Bolt (Carriage Bolt)\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhere are cup square carriage bolts commonly used?\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThese bolts are most commonly used to fix wood to wood or wood to metal structures such as decks, garden furniture, timber frames, fencing, and structural joinery. The square neck, below the head, locks into the material and prevents the bolt from spinning when tightened.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow does the square neck benefit installation?\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThe square neck under the domed head bites into timber or a square hole, providing anti-rotation while tightening the nut. This means you often don’t need a tool on the bolt head as the square neck holds the bolt in place, making assembly easier. \u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use this bolt without a pre-drilled hole?\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eManufactured with a flat end, these bolts need a predrilled hole through the material that matches the M20 diameter.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat nut and washer should I use with this bolt?\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThis carriage bolt comes with a hexagon nut, which is designed to match the thread. You can add washers under the nut to evenly distribute the load and reduce surface pressure on the material.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan these Coach Bolts be used outdoors?\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThese Coach Bolts are manufactured in a Grade 4.8 Steel, with a BZP plating and as such are not ideal for long term external use. If long term external use is required, stainless steel Coach Bolts are advised.\u003cbr\u003e\u003c\/p\u003e","brand":"Fusion Fixings","offers":[{"title":"Qty Price Break - 1","offer_id":56844762808703,"sku":"CSCB-MBZP-20220","price":3.95,"currency_code":"GBP","in_stock":true},{"title":"Qty Price Break - 10","offer_id":56844763169151,"sku":"CSCB-MBZP-20220","price":3.25,"currency_code":"GBP","in_stock":true},{"title":"Qty Price Break - 50","offer_id":56844763595135,"sku":"CSCB-MBZP-20220","price":2.65,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0581\/6090\/6293\/files\/coach-bolt---carriage-bolt-from-Fusion-Fixings_266636d2-b6b8-4355-a7bc-9c58b9d2921b.png?v=1770211889","url":"https:\/\/www.fusionfixings.co.uk\/products\/m20-x-220mm-coach-bolt-carriage-bolt-amp-nut-bzp-grade-4-8-steel-din-603","provider":"Fusion Fixings","version":"1.0","type":"link"}