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When you're building a deck, securing fence posts, or framing a timber structure, you need strong, reliable fasteners that won't let go. These zinc plated steel hex head lag screws (DIN571 standard) are designed as self-tapping wood coach bolts – meaning they cut their own thread into timber for a tight, pull-resistant hold. The zinc coating gives them decent corrosion resistance for indoor and covered outdoor use, while the hex head lets you drive them easily with a wrench or impact driver. Choose from M6, M8, M10, or M12 diameters depending on your load requirements. Perfect for DIYers and professionals who want solid performance without paying a premium for stainless steel.
Self-Tapping Wood Thread – Sharp, aggressive threads bite deep into softwood and hardwood, eliminating the need for nuts or washers. Just drill a pilot hole and drive.
Hex Head for High Torque – Use a hex socket, wrench, or impact driver. No stripping or cam-out like Phillips screws – perfect for heavy driving.
Zinc Plated Steel – Provides a reliable layer of rust protection for interior projects, sheds, decks, and outdoor furniture not constantly exposed to moisture.
DIN571 Standard Coach Bolt Design – Manufactured to precise German industrial specs, ensuring consistent thread geometry and head dimensions across all sizes.
Multiple Size Options (M6 / M8 / M10 / M12) – Choose the right diameter for your load: M6 for light furniture, M8-M10 for general construction, M12 for heavy timber framing.
Cost-Effective Alternative to Stainless – Get excellent strength and decent weather resistance at a fraction of the cost of stainless steel lag bolts.
| Type | Hex Head Lag Wood Self-Tapping Screw / Coach Bolt |
|---|---|
| Material | Zinc Plated Steel |
| Standard | DIN571 |
| Brand | GooBetter Fastener |
| Available Sizes | M6, M8, M10, M12 (metric thread) |
| Head Style | Hexagon |
| Drive Style | Hex socket or wrench |
| Finish | Zinc plated (bright/blue-ish) |
| Application | Wood, timber, softwood, hardwood, decking, fencing, pallets, furniture |
Yes – we strongly recommend drilling a pilot hole about 70-80% of the bolt diameter. For M6, use a 4.5mm bit; for M8 use 6mm; for M10 use 8mm; for M12 use 10mm. Pre-drilling prevents wood splitting, makes driving easier, and ensures the head sits flush.
Zinc plating offers moderate corrosion protection, suitable for covered outdoor areas (porches, sheds, under eaves) and applications not in constant contact with rain or ground moisture. For direct soil contact, salt air (coastal), or pressure-treated lumber, upgrade to stainless steel. For typical decking or fencing, these will hold up well for years with minimal rust.
Lag screws (also called coach bolts) have a hex head and much coarser, deeper threads designed for heavy loads into wood. Regular wood screws have smaller heads and finer threads. These DIN571 lag screws are meant for structural connections like attaching ledger boards, framing deck posts, or securing heavy machinery to wooden floors.
Here’s a quick guide: M6= light duty (furniture, shelving).M8= medium (fence rails, gate hinges).M10= heavy (deck joists, beams).M12= extra heavy (timber framing, log cabins). Measure your wood thickness – the screw should penetrate at least 1.5x the thickness of the top piece.
Absolutely. Use a hex shank socket adapter or a dedicated 1/4" hex impact socket that fits the hex head size (e.g., 10mm for M6, 13mm for M8, 17mm for M10/M12). An impact driver makes quick work of driving these into wood, especially with pre-drilled pilot holes.
