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When standard fasteners fall short on thick timbers and multi-ply beams, these #14 × 5-inch heavy-duty lag screws deliver the reach and pull-out resistance your structural projects demand. Engineered for builders and dedicated DIYers who refuse to compromise on holding strength.
Each 50-pack includes carbon steel lag screws finished with a yellow anti-corrosion coating tested to 1,000 hours of salt spray resistance, plus one T30 star drive bit. The modified truss washer head sits flush for a clean finish, while the knurled shank reduces driving torque and minimizes wood splitting — even near board ends.
Purpose-built for log construction, timber framing, pole barns, ledger board connections, and heavy deck builds where deep penetration and long-term weather resistance are non-negotiable.
Drive deep into thick beams and multi-ply lumber for ledger boards, post connections, and load-bearing timber frame joints that need maximum holding strength.
The 1,000-hour salt spray rated coating stands up to rain, humidity, and pressure-treated lumber — perfect for deck ledgers, pergolas, and outdoor framing.
Extra-long 5-inch reach penetrates deep into solid logs and heavy timbers, providing the pull-out resistance required for log construction and agricultural buildings.
Tackling a timber-frame workshop, heavy garden structure, or major home improvement project? These lag screws deliver contractor-grade performance without the contractor price tag.
| Material | Carbon Steel |
|---|---|
| Thread Size | #14 × 5 in (Nominal Diameter #14) |
| Head Style | Modified Truss Washer Head (Flat) |
| Drive Style | T30 Star Drive |
| Exterior Finish | Yellow Anti-Corrosion Coating |
| Corrosion Resistance | 1,000-Hour Salt Spray Tested |
| Point Style | Flat Point |
| Quantity | 50 Lag Screws + 1 T30 Star Bit |
| Compatible Wood Types | Softwood, Hardwood, ACQ/CA Pressure-Treated Lumber |
| Recommended Pilot Hole | Not required for softwood; 3/16" for hardwood or near board ends |
| Packaging | Reusable, Eco-Friendly Storage Box |
The yellow anti-corrosion coating passed a 1,000-hour salt spray test without failure, providing excellent outdoor durability. Its bright color also makes it easy to visually verify complete coverage before installation — an advantage over black oxide finishes.
The 5-inch length is essential when penetrating thick timbers, combining multiple lumber layers, or building ledger connections. For thin decking boards, a 3-inch or 4-inch screw may be sufficient. Always follow your building plan and local codes.
For most softwoods, the knurled shank allows driving without pre-drilling. In hardwoods or near board ends, a 3/16" pilot hole is recommended to virtually eliminate splitting risk.
Yes — every box includes one genuine T30 star drive bit so you can start fastening right out of the box. Any standard T30 power bit or hand driver will also work.
Yes. The yellow coating is compatible with modern ACQ and CA-treated lumber. Combined with the 1,000-hour salt spray rating, these lag screws resist the chemicals and moisture typically found in treated wood.
Yes. The packaging is designed to be durable and space-saving — close the lid and store it on a shelf or in your tool bag. It's an eco-friendly alternative to single-use plastic bags.
Generally no for softwoods — the knurled shank reduces driving torque enough to go in without a pilot hole. For hardwoods, dense composites, or when working close to the edge of a board, pre-drilling with a 3/16" bit is recommended to prevent splitting.
These are typically used for timber framing, log construction, pole barns, deck ledger boards, pergolas, heavy garden structures, and any application requiring deep penetration into thick solid wood. They are not intended for sheet metal, masonry, or concrete.
