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When standard wood screws strip out or corrode through, you need a fastener built for real structural loads and long-term outdoor exposure. These M8 A2 stainless steel hex head lag bolts give DIYers and tradespeople the holding power and corrosion resistance to tackle decks, timber frames, gate posts, garden furniture, and heavy outdoor structures — without worrying about rust staining or fastener failure.
Manufactured to DIN571 standard, each lag bolt features a coarse wood thread that bites deep into softwood and hardwood alike, and a hex head that accepts a standard 13mm wrench or socket for maximum torque. Available in 18 lengths from 30mm to 200mm (approximately 1-3/16" to 7-7/8") in solid A2 (304) stainless steel — no plating to chip or peel. Bulk packs up to 50 pieces available for trade and project use.
Ideal for deck ledger boards, pergola beam connections, fence post hardware, raised garden bed framing, gate hinges, and heavy-duty furniture assembly. The M8 diameter and DIN571 coarse thread make these lag bolts a reliable choice for structural wood fastening wherever moisture resistance matters.
Attach ledger boards, secure beam-to-post connections, and fasten structural hardware with lag bolts that won’t rust through after a few rainy seasons.
Build raised garden beds, fence panels, and outdoor furniture that stays structurally sound and rust-free even with constant soil and moisture contact.
Stock multiple lengths for timber framing, gate hardware, and structural repairs — the 20 and 50-piece bulk packs keep your van stocked without overpaying.
Replace corroded lag bolts in existing structures, hang heavy wall-mounted shelving into studs, or secure stair stringers and gate hinges with confidence.
| Product Type | Lag Bolt / Lag Screw (Wood Screw) |
|---|---|
| Standard | DIN571 |
| Material | A2 Stainless Steel (304 equivalent) |
| Finish | Natural stainless (untreated) |
| Head Style | Hex Head (External Hexagon) |
| Drive Style | Hex wrench / socket (typically 13mm AF) |
| Thread Diameter | M8 (8mm) |
| Available Lengths | 30, 40, 45, 50, 55, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 180, 200mm |
| Thread Type | Coarse wood thread (DIN571) |
| Grade | A2 |
| Pack Options | 1, 2, 5, 10, 20, 40, 50 pieces |
| System | Metric (M8) |
| Application | Timber, softwood, hardwood, pressure-treated lumber |
Yes. A2 (304) stainless steel resists the corrosive chemicals in modern pressure-treated wood (ACQ, CA). Unlike zinc-coated screws, these won’t develop white rust or black staining on your timber over time.
For M8 lag bolts, pre-drilling is strongly recommended — typically a 6–7mm pilot hole. This prevents timber splitting, reduces driving torque, and helps the hex head seat flush. In softwoods you may be able to skip it, but pre-drilling is always best practice for structural connections.
M8 DIN571 lag bolts typically use a 13mm AF (across flats) hex socket. We recommend verifying with a test fit before starting your project. A ratcheting socket wrench or impact driver with a 13mm socket works well.
Lag bolts are heavy-duty structural fasteners with a larger diameter, deeper coarse threads, and a hex head designed for high-torque installation with a wrench. Regular wood screws have smaller Phillips or Torx heads and are suited for light-to-medium fastening. Lag bolts are the right choice for structural connections like deck ledgers, beam splices, and post hardware.
A2 (304) stainless steel performs well in most outdoor environments including rain, humidity, and general moisture exposure. For direct saltwater spray or constant immersion, A4 (316) stainless would be preferable. For typical garden, deck, and fence applications away from the ocean, these A2 lag bolts will provide many years of reliable service.
A general rule for lag bolts is that at least half the bolt length should penetrate into the receiving member. For example, if fastening a 25mm board to a post, a 80mm lag bolt gives you roughly 55mm of thread engagement in the post — a solid structural connection. Select your length based on the combined thickness of the materials being joined.
DIN571 lag bolts are designed to thread directly into wood — they are not machine-threaded and are not intended for use with standard metric nuts. If you need a through-bolt connection, you would need a standard M8 hex bolt with machine thread instead. These lag bolts are specifically for wood-to-wood or hardware-to-wood fastening.
