🔩 25-Pack | T30 Star Drive Bit Included
Lag Screws 5 Inch – 25PCS #14 x 5" Heavy Duty Structural Wood Screws, Black Coated, Rust Resistant (T30 Star Drive + Washer Head)
🏗️ Need a smaller quantity of heavy-duty fasteners for your next project? These 5-inch structural wood screws deliver the same premium performance as traditional lag bolts – without the hassle. Engineered from hardened carbon steel with a robust black anti-corrosion coating (1000‑hour salt spray tested), they offer outstanding rust protection. The T30 star drive eliminates stripping, while the knurled shank reduces torque and prevents wood cracking. Perfect for deck repairs, pergola braces, timber framing, pole barns, and heavy outdoor joinery. Each 25‑count box includes a T30 star drive bit – ready to use straight out of the box.
- ✅ 1000hr salt spray tested – extreme rust protection
- ⭐ T30 star drive – no stripping, high torque transfer
- 🔩 Knurled shank – reduces splitting & driving effort
- 🏠 Ideal for decks, log homes, timber framing
🌧️ 1. Are these black lag screws truly rustproof for outdoor decks?
Yes – the black coating has passed a 1000‑hour salt spray test, meaning it far exceeds standard zinc or phosphate finishes. It provides excellent protection against rust and corrosion even in wet, coastal, or snowy climates. However, for direct burial in soil or constant saltwater submersion, we recommend stainless steel alternatives.
🔩 2. Do I need to pre‑drill before driving these 5" lag screws?
In most softwoods (pine, cedar, fir) and pressure‑treated lumber, the self‑starting tip and knurled shank allow direct driving without pre‑drilling. For dense hardwoods (oak, hickory, ipe) or when driving near board edges, we recommend a small pilot hole to prevent splitting. Always test on a scrap piece first.
⭐ 3. What driver do I need for the T30 star drive? Is the included bit good quality?
Any impact driver or drill with a 1/4" hex chuck will work. The included T30 star bit is heat‑treated and precision‑machined to fit snugly, reducing wobble and extending bit life. You can also use your own T30 bits, but we include one so you can start right away.
🏗️ 4. Can I use these screws to replace traditional 5" lag bolts in structural applications?
Absolutely. These #14 x 5" structural wood screws meet or exceed the shear strength of 5/16" lag bolts, and they don't require separate pilot holes or washer nuts. They are ideal for beam connections, ledger boards, and post‑to‑beam brackets. Always follow local building codes for structural fasteners.
📦 5. Why buy the 25‑pack instead of the 50‑pack?
The 25‑pack is perfect for smaller jobs: a single pergola bracket set, stair stringer attachment, fence rail repair, or a few heavy shelving brackets. It gives you the same high‑quality fasteners and T30 bit without paying for extras you might not need. If you're tackling a full deck or timber frame, consider the 50‑pack for better value.
🌲 6. Will the black coating react with pressure‑treated lumber?
No – the black coating is designed to be compatible with ACQ (Alkaline Copper Quaternary) and other modern pressure‑treated woods. It will not cause accelerated corrosion or chemical reactions. You can use these screws confidently in all common treated lumber.
