Hex Lag Screws (DIN 571)
Hex lag screws are heavy duty wood screws with a hexagonal head that can be driven with a socket or wrench for high torque. The coarse thread bites deeply into timber and the sharp point starts easily, making them the standard choice for structural timber connections, decking, fencing, playground equipment and marine timber work.
Technical Specifications
| Parameter | Specification |
|---|---|
| Standard | DIN 571 / ASME B18.2.1 |
| Type | Hex head lag screw (wood screw) |
| Size Range | M6 – M20 (1/4" – 3/4") |
| Length Range | 25mm – 300mm |
| Material | Carbon Steel, Stainless Steel SS304 / SS316 |
| Surface Finish | Zinc Plated, Hot Dip Galvanized, Stainless Steel |
| Thread | Coarse wood thread, gimlet point |
| Head | Hex head (washer head and plain head available) |
| MOQ | 500 pcs (standard), 2,000 pcs (custom) |
| Lead Time | 7-15 days (standard), 20-30 days (custom) |
| Packaging | Bulk cartons / Wooden pallets / Custom labeling |
Available Sizes
M6, M8, M10, M12, M16, M20 with lengths 40mm – 300mm
Applications
- Timber frame and structural wood connections
- Decking and boardwalks
- Fencing and gate posts
- Playground and park equipment
- Marine timber and dock structures
- Railway sleepers and landscaping
Certifications
ISO 9001:2015 certified. Material certificates (EN 10204 3.1/3.2). RoHS and REACH compliant.
Frequently Asked Questions
Do lag screws need a pilot hole?
Yes — especially in hardwood. A pilot hole (about 70-75% of the screw diameter in wood) prevents splitting, reduces insertion torque and protects the hex head from damage. In softwood, smaller or no pilots may be acceptable.
What sizes are available?
Available sizes range from M6 – M20 (1/4" – 3/4"). Contact us with your required sizes and quantities for a quick quote.
What is the MOQ and lead time?
The MOQ is 500 pcs (standard), 2,000 pcs (custom). Lead time is 7-15 days (standard), 20-30 days (custom). Mixed-size containers and larger orders are negotiable — send us your requirement for a quick quote.
Do you provide material certificates?
Yes. Material test certificates per EN 10204 3.1 are available on request, and our manufacturing is ISO 9001:2015 certified. RoHS and REACH compliance documentation can also be provided.
