S-91478A840 Length 3" ASME B18.2.1 Wood Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction for extended service life in demanding wood applications
• Maximum torque transmission through external hex drive design, preventing cam-out and ensuring secure installation
• Enhanced holding power with thread-forming design that creates strong, permanent threads in wood materials
• Optimized thread engagement with 2" minimum thread length and 4.5 TPI for superior pull-out resistance
• Easy alignment and starting with pointed tip design that facilitates precise screw placement
• Reduced wood splitting through partially threaded shank design that minimizes stress concentration
• Industry-standard compatibility with standard 1 1/8" wrench sizes for efficient installation

Professional Applications & Engineering Value

These heavy-duty wood screws are engineered to solve critical fastening challenges in wood construction and industrial applications. The zinc-plated steel construction provides essential corrosion protection, while the external hex drive delivers maximum torque transmission without stripping - a common frustration with Phillips or square drives in high-torque situations. The thread-forming design creates permanent, secure threads in wood without pre-drilling in many applications, significantly reducing installation time. With 4.5 threads per inch and 2-inch minimum thread length, these screws distribute load effectively, preventing pull-out in structural wood connections. The partially threaded configuration ensures clamping force is maintained while minimizing the risk of wood splitting, making them ideal for framing, decking, and heavy timber construction where reliability is paramount.

Specification Summary & Compliance

These 3/4" wood screws feature inch system measurements with Class 2A thread tolerances and right-hand threading. Manufacturing and dimensional specifications strictly comply with ASME B18.2.1 standards for hex head screws. Environmental compliance includes RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) compliance for chemical safety. The zinc-plated steel construction meets industry standards for corrosion protection in wood fastening applications.