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When your outdoor deck, timber frame, or heavy woodworking project demands fasteners that won't rust, strip, or fail under load, these M12 A2 stainless steel hex head lag bolts deliver the reliability you need. Built to the DIN571 standard, they combine a sharp wood-screw thread with a hex head that locks securely onto any wrench or socket — no cam-out, no slipping.
Manufactured from 304 stainless steel (A2 grade) with a natural untreated finish, these lag bolts offer excellent corrosion resistance in rain, humidity, and outdoor environments. Available in lengths from 60 mm to 200 mm (approx. 2⅜" to 7⅞") and in packs of 1, 5, 10, or 20 — so you can order exactly what your project requires without overstocking.
Purpose-built for deck construction, timber framing, garden structures, outdoor furniture assembly, and heavy wood joinery where long-term weather resistance and consistent metric dimensions are non-negotiable.
A2 stainless steel resists rain, humidity, and treated lumber chemicals — ideal for deck ledger boards, pergolas, raised garden beds, and any outdoor timber connection that needs to last.
The DIN571 hex head and aggressive wood thread deliver the clamping force needed for post-to-beam connections, heavy joinery, and structural timber assemblies.
Precise M12 metric dimensions and a clean stainless finish make these lag bolts a reliable choice for outdoor furniture assembly, bench repairs, and decorative wood joinery.
Flexible pack sizes mean you can grab exactly the quantity you need — whether it's one bolt for a quick fix or a 20-pack for a weekend project — without paying for a bulk box you won't use.
| Material | 304 Stainless Steel (A2 Grade) |
|---|---|
| Standard | DIN571 |
| Thread Size | M12 |
| Available Lengths | 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, 110 mm, 120 mm, 130 mm, 140 mm, 150 mm, 160 mm, 180 mm, 200 mm |
| Head Style | Hex Head (Flat Underside) |
| Drive Style | Hexagon — wrench or socket (typically 19 mm) |
| Thread Type | Wood Screw Thread (coarse, self-tapping) |
| Finish | Natural / Untreated Stainless Steel |
| Pack Sizes Available | 1, 5, 10, or 20 pieces |
| Compatible Wood Types | Softwood, Hardwood, Outdoor Timber |
| Recommended Pilot Hole | Not required for softwood; approx. 10 mm for hardwood or near board ends |
For softwoods, the sharp wood-screw tip can self-tap without pre-drilling. For hardwoods (oak, maple) or when working near board edges, a pilot hole of approximately 10 mm is recommended to prevent splitting and reduce driving torque.
Yes. A2 (304) stainless steel provides excellent corrosion resistance for most outdoor environments including rain, humidity, and occasional direct moisture. For marine or saltwater environments, A4 (316) grade would be more appropriate — but for decks, fences, garden structures, and outdoor furniture, A2 is a reliable and cost-effective choice.
A standard 19 mm metric hex wrench or socket typically fits the M12 hex head. A ratchet with a deep socket makes driving into wood significantly easier, especially in confined spaces. Avoid using pliers — they can slip and damage the head.
DIN571 is a German industrial standard that defines the dimensions, thread pitch, and geometry for hex head wood screws (lag bolts). It ensures consistent quality and compatibility with standard metric nuts, washers, and tools across manufacturers.
A general rule is that the lag bolt should penetrate at least two-thirds of its length into the receiving member. For example, when fastening a 40 mm board to a timber, a 100–120 mm bolt gives you solid engagement. Always follow your local building codes and structural requirements for load-bearing connections.
Yes. A2 stainless steel is compatible with modern ACQ and CA pressure-treated lumber. Unlike zinc-coated fasteners, stainless steel does not react with the preservative chemicals in treated wood, making it a more durable long-term choice for outdoor applications.
Stainless steel offers superior corrosion resistance with no coating to chip or peel over time. Galvanized bolts can corrode at cut edges or damaged coating areas, especially in contact with treated lumber. Stainless steel maintains its integrity throughout its service life without maintenance.
The 1-piece option is ideal for replacements or testing fit. The 5-pack suits small repairs and single connections. The 10-pack covers medium projects like a garden bench or small deck section. The 20-pack is best for larger builds where you need multiple fasteners of the same size.
