S-91478A820 Length 7" 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 tool slippage during high-tension installations
• Enhanced holding power with thread-forming design that creates stronger mating threads in wood substrates
• Optimized thread engagement with 5 threads per inch configuration for superior pull-out resistance in dense woods
• Versatile partial threading allowing unthreaded shank to act as a built-in washer for improved clamping force distribution
• Precision dimensional control ensuring consistent performance and compatibility with standard hex tools
• Reduced installation effort with pointed tip design that facilitates easier starting and penetration in wood materials

Professional Applications & Engineering Value

These heavy-duty wood screws are engineered to solve critical fastening challenges in structural wood applications where vibration resistance and long-term reliability are paramount. The zinc-plated steel construction provides essential corrosion protection for both indoor and protected outdoor environments, while the external hex drive system delivers unmatched torque capability for high-tension connections in framing, decking, and timber construction. The thread-forming design eliminates the need for pre-tapping in hardwoods and engineered wood products, creating permanent, vibration-resistant threads that maintain clamping force under dynamic loads. With 5 TPI coarse threading and 7-inch length, these screws provide exceptional pull-out resistance in demanding construction and industrial wood fastening scenarios.

Specification Summary & Compliance

Manufactured to ASME B18.2.1 dimensional standards with inch system measurements, these wood screws feature a 5/8" thread diameter, 7" overall length, and 4" minimum thread length. The external hex drive (0.938" head width) ensures compatibility with standard industrial tools. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations confirms the absence of restricted substances, making these screws suitable for regulated industrial applications. The thread-forming tapping method and right-hand threading provide reliable performance in accordance with industrial wood fastening specifications.