Heavy Duty Torx/Star Drive Lag Screws, Bronze Coated Exterior Wood Screws with Modified Truss Washer Head, ACQ Lumber Compatible, Type 17 Sharp Point Construction Fasteners

Our #17 x 4" Torx/Star Drive Wood Screws with Modified Truss Washer Head are heavy-duty structural fasteners engineered to deliver superior strength and reliability for exterior wood construction projects. Crafted with a high-performance bronze-coated exterior finish, these screws provide exceptional resistance to rust, corrosion, and environmental wear, making them ideal for long-term outdoor use. They are fully compatible with ACQ (Alkaline Copper Quaternary) treated lumber, a common preservative-treated wood used in outdoor structures, ensuring reliable performance even in chemically treated environments.

Equipped with a Type 17 notched extra-sharp cutting point, these lag screws feature a specialized design that enables quick, clean starts without "walking"—a common issue where screws drift off course during installation. This sharp point significantly reduces the need for pre-drilling, streamlining the installation process and saving time for both professional contractors and DIY enthusiasts. The integrated knurled screw shoulder further optimizes performance by lowering drill torque requirements, allowing for smoother, easier driving with less effort while minimizing the risk of screw breakage.

The modified truss washer head design combines the stability of a washer with the streamlined profile of a truss head, distributing clamping force evenly across the wood surface to prevent pull-through and enhance overall structural stability. The Torx/Star drive system provides superior torque transfer compared to traditional drive types, minimizing bit slippage and head stripping to ensure fast, damage-free installation. The high-quality thread profile cuts cleanly into wood, creating tight, secure connections that resist vibration and loosening over time.