{"title":"Coach Screws","description":"\u003cp\u003eHex head coach screws (lag bolts) to DIN 571 in M6, M8, M10 and M12, 30mm to 300mm long, bright zinc plated. For timber, sleepers and masonry fixing.\u003c\/p\u003e","products":[{"product_id":"m12-hex-head-coach-screws-lag-bolts-bzp-din-571","title":"M12 (12mm) Hex Head Coach Screws - Heavy Duty BZP Timber Fasteners","description":"\u003cp\u003eM12 hexagon head coach screws, manufactured to \u003cstrong\u003eDIN 571\u003c\/strong\u003e with the wood-screw thread form conforming to \u003cstrong\u003eDIN 7998\u003c\/strong\u003e. Also widely known as lag screws or lag bolts, these heavy-duty fasteners are fitted with a hexagon head rather than a slotted or recessed drive, so they are tightened with a standard spanner, socket or impact wrench rather than a screwdriver – delivering much higher installed torque and a stronger, more positive clamping force than a driven screw head allows. That combination of a robust hex head and a coarse wood-screw thread is what makes the coach screw the standard choice wherever a demanding timber connection needs to be pulled up tight and stay tight.\u003c\/p\u003e\n\n\u003cp\u003eThe screws are manufactured from high-tensile carbon steel and finished with a bright zinc-plated (BZP) coating, giving a good general-purpose level of corrosion resistance.\u003c\/p\u003e\n\n\u003cp\u003eAt 12mm (0.47in) diameter, this is the heaviest-duty size in the coach screw range, built for critical structural and semi-structural timber connections where a lighter-gauge screw would not offer sufficient shank strength or thread engagement. The coarse, deep wood-screw thread is designed to bite directly into timber, generating high pull-out resistance without needing a nut on the far side of the joint. Used with a suitable wall plug, the same screw can also be driven into brick, block or concrete – a genuinely versatile heavy fixing for both timber-to-timber and timber-to-masonry work.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDIN 571 hex head coach screw:\u003c\/strong\u003e manufactured to the DIN 571 dimensional standard, with the wood-screw thread form to DIN 7998, so head, shank and thread dimensions are consistent batch to batch.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHexagon head drive:\u003c\/strong\u003e tightens with a standard spanner, socket or impact wrench, delivering far higher installed torque than a screwdriver-driven screw head.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-tensile carbon steel:\u003c\/strong\u003e gives the shank and thread the strength needed for heavy structural and semi-structural timber connections.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBright zinc-plated (BZP) finish:\u003c\/strong\u003e general-purpose corrosion resistance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e12mm (0.47in) diameter:\u003c\/strong\u003e the heaviest-duty size in the coach screw range, for the most demanding timber fixings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoarse, deep wood-screw thread:\u003c\/strong\u003e bites directly into timber for high pull-out resistance without the need for a nut on the far side.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e19mm (0.75in) head across flats:\u003c\/strong\u003e a single spanner or socket size fits every length in the range.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide length range:\u003c\/strong\u003e 80mm to 300mm (3.15in to 11.81in) across 11 sizes, covering everything from light structural work to heavy sleeper and post fixings.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eLength (l)\u003c\/th\u003e\n\u003cth\u003eThread diameter (d)\u003c\/th\u003e\n\u003cth\u003eHead width across flats (s)\u003c\/th\u003e\n\u003cth\u003eHead height (k)\u003c\/th\u003e\n\u003cth\u003eMin. thread length (b)\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e80mm (3.15in)\u003c\/td\u003e\n\u003ctd\u003e12mm (0.47in)\u003c\/td\u003e\n\u003ctd\u003e19mm (0.75in)\u003c\/td\u003e\n\u003ctd\u003e8mm (0.31in)\u003c\/td\u003e\n\u003ctd\u003e48mm (1.89in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e100mm (3.94in)\u003c\/td\u003e\n\u003ctd\u003e12mm (0.47in)\u003c\/td\u003e\n\u003ctd\u003e19mm (0.75in)\u003c\/td\u003e\n\u003ctd\u003e8mm (0.31in)\u003c\/td\u003e\n\u003ctd\u003e60mm (2.36in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e120mm (4.72in)\u003c\/td\u003e\n\u003ctd\u003e12mm (0.47in)\u003c\/td\u003e\n\u003ctd\u003e19mm (0.75in)\u003c\/td\u003e\n\u003ctd\u003e8mm (0.31in)\u003c\/td\u003e\n\u003ctd\u003e72mm (2.83in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e140mm (5.51in)\u003c\/td\u003e\n\u003ctd\u003e12mm (0.47in)\u003c\/td\u003e\n\u003ctd\u003e19mm (0.75in)\u003c\/td\u003e\n\u003ctd\u003e8mm (0.31in)\u003c\/td\u003e\n\u003ctd\u003e84mm (3.31in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e160mm (6.30in)\u003c\/td\u003e\n\u003ctd\u003e12mm (0.47in)\u003c\/td\u003e\n\u003ctd\u003e19mm (0.75in)\u003c\/td\u003e\n\u003ctd\u003e8mm (0.31in)\u003c\/td\u003e\n\u003ctd\u003e96mm (3.78in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e180mm (7.09in)\u003c\/td\u003e\n\u003ctd\u003e12mm (0.47in)\u003c\/td\u003e\n\u003ctd\u003e19mm (0.75in)\u003c\/td\u003e\n\u003ctd\u003e8mm (0.31in)\u003c\/td\u003e\n\u003ctd\u003e108mm (4.25in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e200mm (7.87in)\u003c\/td\u003e\n\u003ctd\u003e12mm (0.47in)\u003c\/td\u003e\n\u003ctd\u003e19mm (0.75in)\u003c\/td\u003e\n\u003ctd\u003e8mm (0.31in)\u003c\/td\u003e\n\u003ctd\u003e120mm (4.72in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e220mm (8.66in)\u003c\/td\u003e\n\u003ctd\u003e12mm (0.47in)\u003c\/td\u003e\n\u003ctd\u003e19mm (0.75in)\u003c\/td\u003e\n\u003ctd\u003e8mm (0.31in)\u003c\/td\u003e\n\u003ctd\u003e132mm (5.20in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e240mm (9.45in)\u003c\/td\u003e\n\u003ctd\u003e12mm (0.47in)\u003c\/td\u003e\n\u003ctd\u003e19mm (0.75in)\u003c\/td\u003e\n\u003ctd\u003e8mm (0.31in)\u003c\/td\u003e\n\u003ctd\u003e144mm (5.67in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e260mm (10.24in)\u003c\/td\u003e\n\u003ctd\u003e12mm (0.47in)\u003c\/td\u003e\n\u003ctd\u003e19mm (0.75in)\u003c\/td\u003e\n\u003ctd\u003e8mm (0.31in)\u003c\/td\u003e\n\u003ctd\u003e156mm (6.14in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e300mm (11.81in)\u003c\/td\u003e\n\u003ctd\u003e12mm (0.47in)\u003c\/td\u003e\n\u003ctd\u003e19mm (0.75in)\u003c\/td\u003e\n\u003ctd\u003e8mm (0.31in)\u003c\/td\u003e\n\u003ctd\u003e180mm (7.09in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eThread, head and drive dimensions are as specified in DIN 571 for the M12 (12mm) thread size. Minimum thread length is DIN 571's own specified 60% of the overall shank length – actual thread length on a given batch may run longer than this minimum.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eTypical Applications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe coach screw's combination of a hex head, for high installed torque, and a deep wood-screw thread, for high pull-out resistance, makes it well suited to permanent, load-bearing timber connections:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStructural timber:\u003c\/strong\u003e beams, joists and wall plates, where a strong mechanical connection needs to be pulled up tight with a spanner, socket or wrench rather than driven with a screwdriver.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDecking and outdoor timber structures:\u003c\/strong\u003e decking subframes, pergolas and carports, with the screw's high pull-out resistance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeavy-duty fencing and gates:\u003c\/strong\u003e fence posts, gate hinges and supports, where a fixing that can be torqued up hard and won't work loose is essential.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLandscaping work:\u003c\/strong\u003e railway-sleeper retaining walls and raised beds, where the coarse thread bites securely into dense, often reclaimed sleeper timber.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTimber-to-masonry fixing:\u003c\/strong\u003e with a suitable wall plug, the same screw can be used to fix large brackets or heavy-duty ironmongery into brick, block or concrete.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eInstallation Guidance\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003ePre-drilling a pilot hole is strongly recommended to prevent the timber from splitting and to ease driving, particularly at this larger 12mm diameter:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill a clearance hole\u003c\/strong\u003e through the first (fixing) timber, sized to the screw's shank diameter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill a pilot hole\u003c\/strong\u003e into the second timber, sized to roughly the thread's root diameter – use a smaller pilot in softer timbers and a larger one in dense hardwoods.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill to at least the full length\u003c\/strong\u003e of the screw before driving, rather than relying on the screw to cut its own way through undrilled timber.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrive home\u003c\/strong\u003e with a 19mm (0.75in) spanner, socket or impact wrench.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFit a washer under the head\u003c\/strong\u003e as good practice – this spreads the load and helps prevent the head sinking into softer timber.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eOrder before 2pm Mon–Fri for same-day dispatch from our UK warehouse.\u003c\/p\u003e","brand":"DIYUK","offers":[{"title":"80mm \/ 1","offer_id":53535993037181,"sku":"DIN571-M12x80-01","price":5.6,"currency_code":"GBP","in_stock":true},{"title":"80mm \/ 2","offer_id":53535993069949,"sku":"DIN571-M12x80-02","price":7.1,"currency_code":"GBP","in_stock":true},{"title":"80mm \/ 5","offer_id":53535993102717,"sku":"DIN571-M12x80-05","price":7.48,"currency_code":"GBP","in_stock":true},{"title":"80mm \/ 10","offer_id":53535993135485,"sku":"DIN571-M12x80-10","price":8.47,"currency_code":"GBP","in_stock":true},{"title":"80mm \/ 20","offer_id":53535993201021,"sku":"DIN571-M12x80-20","price":12.1,"currency_code":"GBP","in_stock":true},{"title":"80mm \/ 100","offer_id":53535993168253,"sku":"DIN571-M12x80-100","price":26.6,"currency_code":"GBP","in_stock":false},{"title":"100mm \/ 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Also known as lag screws, lag bolts or hex head wood screws, these heavy-duty fasteners use a hexagon head rather than a slotted or recessed drive, so they can be tightened with a standard spanner or socket for far higher torque than a screwdriver allows – useful wherever a fixing needs to be pulled up firmly and, if necessary, checked or re-tightened later.\u003c\/p\u003e\n\u003cp\u003eThe screws are manufactured from steel and finished with a bright zinc-plated (BZP) coating, giving general-purpose corrosion resistance.\u003c\/p\u003e\n\u003cp\u003eThe coarse, deep wood-screw thread is designed to bite directly into timber, generating high pull-out resistance without needing a nut on the far side – making these screws well suited to structural and semi-structural timber connections, as well as general joinery and assembly work. Used with a suitable wall plug, they can also be driven into brick, block or concrete, giving one fastener that covers both timber-to-timber and timber-to-masonry fixing.\u003c\/p\u003e\n\u003cp\u003eEight lengths cover these 6mm coach screws, so you can choose coach screws M6 x 40mm through to M6 x 120mm to suit different timber thicknesses and joint depths: short coach screws at 40mm and 50mm, mid lengths at 60mm, 70mm, 80mm and 90mm, and long wood screws for thicker timber, including 100mm wood screws and a 120mm length. Every size takes the same 10mm (0.39in) spanner or socket, so these hex screws are simple to install using standard tools.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMade to DIN 571, so diameter, head and thread geometry are consistent and standards-based across every length\u003c\/li\u003e\n\u003cli\u003eHexagon head is driven with a 10mm (0.39in) spanner or socket rather than a screwdriver, allowing much higher installation torque and a more positive, controllable fixing\u003c\/li\u003e\n\u003cli\u003eSteel construction with a bright zinc-plated (BZP) finish, for general-purpose corrosion resistance\u003c\/li\u003e\n\u003cli\u003eCoarse, deep wood-screw thread bites directly into timber and develops high pull-out resistance without a nut needed on the reverse face\u003c\/li\u003e\n\u003cli\u003eSupplied in eight lengths from 40mm (1.57in) up to 120mm (4.72in), all in a single M6 (6mm) thread diameter, to suit different timber thicknesses and joint depths\u003c\/li\u003e\n\u003cli\u003eThread length is 60% of the overall screw length on every size, giving a longer grip length as the screw gets longer\u003c\/li\u003e\n\u003cli\u003eDoubles as a masonry fixing when paired with a suitable wall plug, for fixing timber into brick, block or concrete as well as timber-to-timber\u003c\/li\u003e\n\u003cli\u003eAlso known as a lag screw or lag bolt – a heavy-duty alternative to a coach bolt where fitting a nut and a full through-hole isn't practical\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eLength (l)\u003c\/th\u003e\n\u003cth\u003eThread diameter (d)\u003c\/th\u003e\n\u003cth\u003eHead width across flats (s)\u003c\/th\u003e\n\u003cth\u003eHead height (k)\u003c\/th\u003e\n\u003cth\u003eThread length (Lg)\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e40mm (1.57in)\u003c\/td\u003e\n\u003ctd\u003e6mm (0.24in)\u003c\/td\u003e\n\u003ctd\u003e10mm (0.39in)\u003c\/td\u003e\n\u003ctd\u003e4mm (0.16in)\u003c\/td\u003e\n\u003ctd\u003e24mm (0.94in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e50mm (1.97in)\u003c\/td\u003e\n\u003ctd\u003e6mm (0.24in)\u003c\/td\u003e\n\u003ctd\u003e10mm (0.39in)\u003c\/td\u003e\n\u003ctd\u003e4mm (0.16in)\u003c\/td\u003e\n\u003ctd\u003e30mm (1.18in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e60mm (2.36in)\u003c\/td\u003e\n\u003ctd\u003e6mm (0.24in)\u003c\/td\u003e\n\u003ctd\u003e10mm (0.39in)\u003c\/td\u003e\n\u003ctd\u003e4mm (0.16in)\u003c\/td\u003e\n\u003ctd\u003e36mm (1.42in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e70mm (2.76in)\u003c\/td\u003e\n\u003ctd\u003e6mm (0.24in)\u003c\/td\u003e\n\u003ctd\u003e10mm (0.39in)\u003c\/td\u003e\n\u003ctd\u003e4mm (0.16in)\u003c\/td\u003e\n\u003ctd\u003e42mm (1.65in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e80mm (3.15in)\u003c\/td\u003e\n\u003ctd\u003e6mm (0.24in)\u003c\/td\u003e\n\u003ctd\u003e10mm (0.39in)\u003c\/td\u003e\n\u003ctd\u003e4mm (0.16in)\u003c\/td\u003e\n\u003ctd\u003e48mm (1.89in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e90mm (3.54in)\u003c\/td\u003e\n\u003ctd\u003e6mm (0.24in)\u003c\/td\u003e\n\u003ctd\u003e10mm (0.39in)\u003c\/td\u003e\n\u003ctd\u003e4mm (0.16in)\u003c\/td\u003e\n\u003ctd\u003e54mm (2.13in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e100mm (3.94in)\u003c\/td\u003e\n\u003ctd\u003e6mm (0.24in)\u003c\/td\u003e\n\u003ctd\u003e10mm (0.39in)\u003c\/td\u003e\n\u003ctd\u003e4mm (0.16in)\u003c\/td\u003e\n\u003ctd\u003e60mm (2.36in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e120mm (4.72in)\u003c\/td\u003e\n\u003ctd\u003e6mm (0.24in)\u003c\/td\u003e\n\u003ctd\u003e10mm (0.39in)\u003c\/td\u003e\n\u003ctd\u003e4mm (0.16in)\u003c\/td\u003e\n\u003ctd\u003e72mm (2.83in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eThread, head and drive dimensions are as specified in DIN 571 for the M6 (6mm) thread size.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTypical Applications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eTimber-to-timber structural and semi-structural connections, such as joists, framing members and posts, where high pull-out resistance is needed but there is no access to fit a nut on the reverse side\u003c\/li\u003e\n\u003cli\u003eOutdoor timber structures such as garden decking frames and joists, pergolas and gazebos, and fence and gate construction, where a spanner-driven fixing gives a controlled, firm tightening in exposed structural timber\u003c\/li\u003e\n\u003cli\u003eHeavy joinery and assembly work, including workbenches and furniture, where a strong, spanner-tightened fixing is preferred over a screwdriver-driven wood screw\u003c\/li\u003e\n\u003cli\u003eFurniture making, interior fittings, and repair and renovation projects in timber\u003c\/li\u003e\n\u003cli\u003eFixing timber battens, brackets or fixtures directly to brick, block or concrete, when the screw is used together with a suitable wall plug\u003c\/li\u003e\n\u003cli\u003eAny general DIY or trade job calling for a robust hexagon-head wood screw that can be tightened to a firm, positive torque, and checked or re-tightened later with the same spanner or socket\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eInstallation Guidance\u003c\/strong\u003e\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003eDrill a clearance hole through the first (fixing) timber, sized to the screw's 6mm (0.24in) shank, so this piece can pull down freely onto the timber beneath it\u003c\/li\u003e\n\u003cli\u003eDrill a smaller pilot hole into the second (holding) timber, sized to roughly the thread's root diameter – use a smaller pilot in softer timbers and a slightly larger one in dense hardwoods, to prevent splitting\u003c\/li\u003e\n\u003cli\u003eDrill both holes to at least the full length of the screw being fitted\u003c\/li\u003e\n\u003cli\u003eDrive the screw home with a 10mm (0.39in) spanner or socket – the hexagon head allows significantly higher torque than a screwdriver-driven alternative\u003c\/li\u003e\n\u003cli\u003eFit a washer under the head where practical, to spread the load and stop the head sinking into softer timber\u003c\/li\u003e\n\u003cli\u003eFor fixing into masonry, insert a suitable wall plug into the pre-drilled hole before driving the screw home\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cstrong\u003eCommon Questions\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhich length do I need?\u003c\/strong\u003e\u003cbr\u003eChoose a length that passes through the timber you are fixing and leaves the threaded part in the timber beneath. Thread length is 60% of the screw length, listed for every size in the table above.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat spanner or socket fits?\u003c\/strong\u003e\u003cbr\u003eA 10mm (0.39in) spanner or socket fits the head of every length of these hex head screws.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo I need to pre-drill?\u003c\/strong\u003e\u003cbr\u003eYes: a clearance hole through the first timber and a smaller pilot hole into the second, as in the Installation Guidance above, to prevent splitting.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I fix them into brick or concrete?\u003c\/strong\u003e\u003cbr\u003eYes, with a suitable wall plug in brick, block or concrete.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use them outdoors?\u003c\/strong\u003e\u003cbr\u003eYes. As exterior coach screws they suit outdoor timber structures such as decking frames, pergolas, gazebos, fences and gates; the manufacturer lists external structures exposed to weather conditions among their uses.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat pack sizes are available?\u003c\/strong\u003e\u003cbr\u003ePacks of 1, 2, 5, 10, 20 or 100 screws in every length.\u003c\/p\u003e","brand":"DIYUK","offers":[{"title":"40mm \/ 1","offer_id":53536067256701,"sku":"DIN571-M6X40-01","price":5.47,"currency_code":"GBP","in_stock":true},{"title":"40mm \/ 2","offer_id":53536067289469,"sku":"DIN571-M6X40-02","price":5.47,"currency_code":"GBP","in_stock":true},{"title":"40mm \/ 5","offer_id":53536067322237,"sku":"DIN571-M6X40-05","price":5.6,"currency_code":"GBP","in_stock":true},{"title":"40mm \/ 10","offer_id":53536067355005,"sku":"DIN571-M6X40-10","price":5.85,"currency_code":"GBP","in_stock":true},{"title":"40mm \/ 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Also known as lag screws, lag bolts or hex head wood screws, these heavy-duty fasteners use a hexagon head rather than a slotted or recessed drive, so they can be tightened with a standard spanner or socket for much higher torque than a screwdriver allows – useful wherever a standard wood screw can't generate enough clamping force on its own.\u003c\/p\u003e\n\u003cp\u003eThe screws are manufactured from high-tensile carbon steel and finished with a bright zinc-plated (BZP) coating, giving general-purpose corrosion resistance.\u003c\/p\u003e\n\u003cp\u003eThe coarse, deep wood-screw thread is designed to bite directly into timber, generating high pull-out resistance without needing a nut on the far side – making these screws well suited to structural and semi-structural timber connections. Used with a suitable wall plug, they can also be driven into brick, block or concrete.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eManufactured to DIN 571, so thread, head and drive sizes are consistent and standard-compliant across every length.\u003c\/li\u003e\n\u003cli\u003eHexagon head accepts a standard spanner or socket rather than a screwdriver, allowing far greater tightening torque – useful for dense or hardwood timber and heavier structural fixings.\u003c\/li\u003e\n\u003cli\u003eHigh-tensile carbon steel construction with a bright zinc-plated (BZP) finish for reliable general-purpose corrosion resistance.\u003c\/li\u003e\n\u003cli\u003eCoarse, deep wood-screw thread bites directly into timber and generates high pull-out resistance without requiring a nut on the reverse face.\u003c\/li\u003e\n\u003cli\u003eAlso known as lag screws or lag bolts, and suited to structural and semi-structural timber-to-timber connections.\u003c\/li\u003e\n\u003cli\u003eAvailable in seven lengths from 30mm (1.18in) to 160mm (6.30in), all sharing the same M8 (8mm \/ 0.31in) thread diameter and 13mm (0.51in) head across flats.\u003c\/li\u003e\n\u003cli\u003eThread length is 60% of the overall screw length on every size, giving a longer grip length as the screw gets longer.\u003c\/li\u003e\n\u003cli\u003eCan be combined with a suitable wall plug to fix into brick, block or concrete as well as solid timber.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eLength (l)\u003c\/th\u003e\n\u003cth\u003eThread diameter (d)\u003c\/th\u003e\n\u003cth\u003eHead width across flats (s)\u003c\/th\u003e\n\u003cth\u003eHead height (k)\u003c\/th\u003e\n\u003cth\u003eThread length (Lg)\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e30mm (1.18in)\u003c\/td\u003e\n\u003ctd\u003e8mm (0.31in)\u003c\/td\u003e\n\u003ctd\u003e13mm (0.51in)\u003c\/td\u003e\n\u003ctd\u003e5.3mm (0.21in)\u003c\/td\u003e\n\u003ctd\u003e18mm (0.71in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e40mm (1.57in)\u003c\/td\u003e\n\u003ctd\u003e8mm (0.31in)\u003c\/td\u003e\n\u003ctd\u003e13mm (0.51in)\u003c\/td\u003e\n\u003ctd\u003e5.3mm (0.21in)\u003c\/td\u003e\n\u003ctd\u003e24mm (0.94in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e60mm (2.36in)\u003c\/td\u003e\n\u003ctd\u003e8mm (0.31in)\u003c\/td\u003e\n\u003ctd\u003e13mm (0.51in)\u003c\/td\u003e\n\u003ctd\u003e5.3mm (0.21in)\u003c\/td\u003e\n\u003ctd\u003e36mm (1.42in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e80mm (3.15in)\u003c\/td\u003e\n\u003ctd\u003e8mm (0.31in)\u003c\/td\u003e\n\u003ctd\u003e13mm (0.51in)\u003c\/td\u003e\n\u003ctd\u003e5.3mm (0.21in)\u003c\/td\u003e\n\u003ctd\u003e48mm (1.89in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e100mm (3.94in)\u003c\/td\u003e\n\u003ctd\u003e8mm (0.31in)\u003c\/td\u003e\n\u003ctd\u003e13mm (0.51in)\u003c\/td\u003e\n\u003ctd\u003e5.3mm (0.21in)\u003c\/td\u003e\n\u003ctd\u003e60mm (2.36in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e140mm (5.51in)\u003c\/td\u003e\n\u003ctd\u003e8mm (0.31in)\u003c\/td\u003e\n\u003ctd\u003e13mm (0.51in)\u003c\/td\u003e\n\u003ctd\u003e5.3mm (0.21in)\u003c\/td\u003e\n\u003ctd\u003e84mm (3.31in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e160mm (6.30in)\u003c\/td\u003e\n\u003ctd\u003e8mm (0.31in)\u003c\/td\u003e\n\u003ctd\u003e13mm (0.51in)\u003c\/td\u003e\n\u003ctd\u003e5.3mm (0.21in)\u003c\/td\u003e\n\u003ctd\u003e96mm (3.78in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eThread, head and drive dimensions are as specified in DIN 571 for the M8 (8mm) thread size.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTypical Applications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe combination of a coarse, deep wood-screw thread, high pull-out resistance and a spanner-drivable hexagon head makes these coach screws well suited to a wide range of structural and semi-structural timber fixing tasks, including:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDecking frames, ledger boards and joists, where high pull-out resistance and spanner-driven torque suit structural timber-to-timber connections.\u003c\/li\u003e\n\u003cli\u003eFence posts, rails and gate hardware, including heavier gate fittings that need a secure, split-resistant fixing.\u003c\/li\u003e\n\u003cli\u003eGeneral timber framing and carpentry work, wherever a coarse-thread, hex-drive fastener is preferred over a standard wood screw.\u003c\/li\u003e\n\u003cli\u003eFurniture making, interior fittings, and repair and renovation projects in timber.\u003c\/li\u003e\n\u003cli\u003eLandscaping projects such as railway-sleeper retaining walls and raised beds, where the longer lengths bite deep into thick timber sections.\u003c\/li\u003e\n\u003cli\u003eWith a wall plug, fixing heavy-duty ironmongery, brackets and fittings into brick, block or concrete.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eInstallation Guidance\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003ePre-drilling correctly is the single biggest factor in a strong, split-free fixing with a coach screw this size. As a general guide:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePre-drill a pilot hole – strongly recommended to prevent the timber splitting and to ease driving.\u003c\/li\u003e\n\u003cli\u003eDrill a clearance hole through the first (fixing) timber, sized to the screw's shank.\u003c\/li\u003e\n\u003cli\u003eDrill a smaller pilot hole into the second timber, sized to roughly the thread's root diameter – use a smaller pilot in softer timbers than in dense hardwoods.\u003c\/li\u003e\n\u003cli\u003eDrill to at least the full length of the screw before driving.\u003c\/li\u003e\n\u003cli\u003eDrive home with a 13mm (0.51in) spanner or socket.\u003c\/li\u003e\n\u003cli\u003eFit a washer under the head – good practice that spreads the load and stops the head sinking into softer timber.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCommon Questions\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhich length do I need?\u003c\/strong\u003e\u003cbr\u003eChoose a length that passes through the timber you are fixing and leaves the threaded part in the timber beneath. Thread length is 60% of the screw length, listed for every size in the table above.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat spanner or socket fits?\u003c\/strong\u003e\u003cbr\u003eA 13mm (0.51in) spanner or socket on every length.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo I need to pre-drill?\u003c\/strong\u003e\u003cbr\u003eYes, a pilot hole is strongly recommended to prevent splitting: a clearance hole through the first timber and a smaller pilot hole into the second, as in the Installation Guidance above.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I fix them into brick or concrete?\u003c\/strong\u003e\u003cbr\u003eYes, with a suitable wall plug in brick, block or concrete.\u003c\/p\u003e","brand":"DIYUK","offers":[{"title":"30mm \/ 1","offer_id":53538263073149,"sku":"DIN571-M8x30-01","price":5.47,"currency_code":"GBP","in_stock":true},{"title":"30mm \/ 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Also known as lag screws, lag bolts or hex head wood screws, these heavy-duty fasteners use a hexagon head rather than a slotted or recessed drive, so they can be tightened with a standard spanner or socket for far higher torque than a screwdriver allows, ideal wherever a strong, dependable heavy-timber fixing is needed. The design needs no nut on the reverse face: the coarse wood-screw thread draws directly into the timber (or, with a wall plug, into masonry), making these a practical choice wherever there's no way to get behind the fixing to hold a nut in place.\u003c\/p\u003e\n\n\u003cp\u003eManufactured from carbon steel and finished with a bright zinc-plated (BZP) coating, these screws offer reliable general-purpose corrosion resistance.\u003c\/p\u003e\n\n\u003cp\u003eThe coarse, deep wood-screw thread is engineered to bite directly into timber, generating strong pull-out resistance without requiring a nut on the reverse side, making these screws well suited to structural and semi-structural heavy-timber connections such as decking subframes and railway sleeper landscaping. Used together with a suitable wall plug, the same hex-head design can also be driven into brick, block or concrete.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufactured to DIN 571:\u003c\/strong\u003e head, drive and thread dimensions follow the DIN 571 standard across every length.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHexagon head drive:\u003c\/strong\u003e tightened with a standard 17mm (0.67in) spanner or socket rather than a screwdriver, allowing far higher installation torque for a firmer, more dependable fixing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCarbon steel construction:\u003c\/strong\u003e a robust base material, built for durability and resistance to loads, suited to structural and semi-structural timber connections.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBright zinc-plated (BZP) finish:\u003c\/strong\u003e dependable general-purpose corrosion resistance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoarse wood-screw thread:\u003c\/strong\u003e bites directly into timber for strong pull-out resistance, with no nut required on the reverse face.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo-nut fixing method:\u003c\/strong\u003e works into a single thickness of timber, or, with a wall plug, into brick, block or concrete, ideal where the reverse face isn't accessible.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide length range:\u003c\/strong\u003e stocked from M10 x 60mm up to M10 x 300mm across 11 lengths, covering everything from lighter structural fixings to deep sleeper and post connections.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConsistent thread proportions:\u003c\/strong\u003e minimum thread length is fixed at 60% of the overall shank length under DIN 571, so longer screws carry proportionately more thread engagement.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eLength (l)\u003c\/th\u003e\n\u003cth\u003eThread diameter (d)\u003c\/th\u003e\n\u003cth\u003eHead width across flats (s)\u003c\/th\u003e\n\u003cth\u003eHead height (k)\u003c\/th\u003e\n\u003cth\u003eThread length (Lg)\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e60mm (2.36in)\u003c\/td\u003e\n\u003ctd\u003e10mm (0.39in)\u003c\/td\u003e\n\u003ctd\u003e17mm (0.67in)\u003c\/td\u003e\n\u003ctd\u003e6.8mm (0.27in)\u003c\/td\u003e\n\u003ctd\u003e36mm (1.42in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e80mm (3.15in)\u003c\/td\u003e\n\u003ctd\u003e10mm (0.39in)\u003c\/td\u003e\n\u003ctd\u003e17mm (0.67in)\u003c\/td\u003e\n\u003ctd\u003e6.8mm (0.27in)\u003c\/td\u003e\n\u003ctd\u003e48mm (1.89in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e100mm (3.94in)\u003c\/td\u003e\n\u003ctd\u003e10mm (0.39in)\u003c\/td\u003e\n\u003ctd\u003e17mm (0.67in)\u003c\/td\u003e\n\u003ctd\u003e6.8mm (0.27in)\u003c\/td\u003e\n\u003ctd\u003e60mm (2.36in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e120mm (4.72in)\u003c\/td\u003e\n\u003ctd\u003e10mm (0.39in)\u003c\/td\u003e\n\u003ctd\u003e17mm (0.67in)\u003c\/td\u003e\n\u003ctd\u003e6.8mm (0.27in)\u003c\/td\u003e\n\u003ctd\u003e72mm (2.83in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e140mm (5.51in)\u003c\/td\u003e\n\u003ctd\u003e10mm (0.39in)\u003c\/td\u003e\n\u003ctd\u003e17mm (0.67in)\u003c\/td\u003e\n\u003ctd\u003e6.8mm (0.27in)\u003c\/td\u003e\n\u003ctd\u003e84mm (3.31in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e160mm (6.30in)\u003c\/td\u003e\n\u003ctd\u003e10mm (0.39in)\u003c\/td\u003e\n\u003ctd\u003e17mm (0.67in)\u003c\/td\u003e\n\u003ctd\u003e6.8mm (0.27in)\u003c\/td\u003e\n\u003ctd\u003e96mm (3.78in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e180mm (7.09in)\u003c\/td\u003e\n\u003ctd\u003e10mm (0.39in)\u003c\/td\u003e\n\u003ctd\u003e17mm (0.67in)\u003c\/td\u003e\n\u003ctd\u003e6.8mm (0.27in)\u003c\/td\u003e\n\u003ctd\u003e108mm (4.25in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e200mm (7.87in)\u003c\/td\u003e\n\u003ctd\u003e10mm (0.39in)\u003c\/td\u003e\n\u003ctd\u003e17mm (0.67in)\u003c\/td\u003e\n\u003ctd\u003e6.8mm (0.27in)\u003c\/td\u003e\n\u003ctd\u003e120mm (4.72in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e220mm (8.66in)\u003c\/td\u003e\n\u003ctd\u003e10mm (0.39in)\u003c\/td\u003e\n\u003ctd\u003e17mm (0.67in)\u003c\/td\u003e\n\u003ctd\u003e6.8mm (0.27in)\u003c\/td\u003e\n\u003ctd\u003e132mm (5.20in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e240mm (9.45in)\u003c\/td\u003e\n\u003ctd\u003e10mm (0.39in)\u003c\/td\u003e\n\u003ctd\u003e17mm (0.67in)\u003c\/td\u003e\n\u003ctd\u003e6.8mm (0.27in)\u003c\/td\u003e\n\u003ctd\u003e144mm (5.67in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e300mm (11.81in)\u003c\/td\u003e\n\u003ctd\u003e10mm (0.39in)\u003c\/td\u003e\n\u003ctd\u003e17mm (0.67in)\u003c\/td\u003e\n\u003ctd\u003e6.8mm (0.27in)\u003c\/td\u003e\n\u003ctd\u003e180mm (7.09in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003eThread, head and drive dimensions above are as specified in DIN 571 for the M10 (10mm) thread size and are constant across every stocked length.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eTypical Applications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe combination of a heavy-duty hex head, deep wood-screw thread and wide length range makes these M10 coach screws suited to a broad range of heavy-timber and masonry fixing jobs, including:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDecking and veranda subframes:\u003c\/strong\u003e fixing bearers, joists and ledger boards where a strong, spanner-tightened connection is needed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRailway sleeper landscaping:\u003c\/strong\u003e securing sleepers used for retaining walls, raised beds, steps and garden edging.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeavy timber framing and structural joinery:\u003c\/strong\u003e connections calling for more installation torque than a screwdriver-driven fastener can deliver.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFurniture, interior fittings and renovation:\u003c\/strong\u003e furniture making, interior fittings, and repair and renovation projects in timber.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFence posts, rails and gate hardware:\u003c\/strong\u003e fixing gate hinges, latches and rail brackets to substantial timber posts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePergolas, carports and garden structures:\u003c\/strong\u003e joining structural timber members that need a dependable, load-bearing fixing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFixing wall plates and heavy-duty ironmongery to masonry:\u003c\/strong\u003e using a suitable wall plug, the same hex-head screw drives into brick, block or concrete.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLonger lengths (220mm–300mm):\u003c\/strong\u003e suited to deep connections through thick timber sections, or where the fixing needs to reach well into a solid masonry or sleeper substrate.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eInstallation Guidance\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003ePre-drilling is strongly recommended to prevent the timber from splitting and to ease driving:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill a clearance hole\u003c\/strong\u003e through the first (fixing) timber, sized to the screw's shank, so the two timbers draw together as the screw is tightened rather than binding in the top piece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill a pilot hole\u003c\/strong\u003e into the second timber, sized to roughly the thread's root diameter (softer timbers need a smaller pilot than dense hardwoods), drilled to at least the full length of the screw.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrive home with a 17mm (0.67in) spanner or socket\u003c\/strong\u003e rather than a screwdriver, keeping the tool square on the head to avoid rounding off the flats.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFit a washer under the head\u003c\/strong\u003e as good practice; it spreads the load over a wider area and stops the head sinking into softer timber as it's tightened.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFor masonry fixings,\u003c\/strong\u003e drill to accommodate a suitable wall plug, insert the plug, then drive the coach screw in as normal.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eCommon Questions\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhich length do I need?\u003c\/strong\u003e\u003cbr\u003eChoose a length that passes through the timber you are fixing and leaves the threaded part in the timber beneath. Thread length is 60% of the screw length, listed for every size in the table above.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat spanner or socket fits?\u003c\/strong\u003e\u003cbr\u003eA 17mm (0.67in) spanner or socket on every length.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo I need to pre-drill?\u003c\/strong\u003e\u003cbr\u003eYes, pre-drilling is strongly recommended to prevent splitting: a clearance hole through the first timber and a pilot hole into the second, as in the Installation Guidance above.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I fix them into brick or concrete?\u003c\/strong\u003e\u003cbr\u003eYes, with a suitable wall plug in brick, block or concrete.\u003c\/p\u003e","brand":"DIYUK","offers":[{"title":"60mm \/ 1","offer_id":53539611083133,"sku":"DIN571-M10x60-01","price":5.6,"currency_code":"GBP","in_stock":true},{"title":"60mm \/ 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