S-91478A740 Length 8" ASME B18.2.1 Wood Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, ensuring long-term durability in demanding wood applications
• Maximum torque transmission through the external hex drive design, preventing tool slippage during high-tension installations
• Exceptional pull-out resistance achieved through thread forming technology, creating permanent threads in wood substrates
• Optimized thread engagement with 6 threads per inch and partial threading, providing superior holding power while reducing installation effort
• Heavy-duty length capacity with 8" penetration depth, ideal for thick wood members and structural connections
• Precision manufacturing ensures consistent 1/2" diameter and dimensional accuracy across all production batches
• Right-hand threading with pointed tip facilitates straightforward installation and quick alignment in wood materials

Professional Applications & Engineering Value

These heavy-duty wood screws are engineered to solve critical challenges in wood construction and industrial applications where structural integrity is paramount. The zinc-plated steel construction provides essential corrosion protection for both indoor and outdoor wood structures, while the external hex drive system delivers unmatched torque capability for high-tension fastening scenarios. The thread forming design creates permanent, compressed threads in wood fibers that significantly outperform cut threads in pull-out resistance, making them ideal for load-bearing connections, timber framing, and structural wood assemblies. With their 8" length and 1/2" diameter, these screws bridge thick wood members securely, eliminating the need for through-bolting in many applications while maintaining superior clamping force.

Specification Summary & Compliance

Manufactured to exacting ASME B18.2.1 specifications ensuring dimensional precision and mechanical performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards for industrial safety. Features include: 1/2" diameter with 6 threads per inch, right-hand thread direction, partial threading with minimum 4 1/2" thread length, and 3/4" hex head for standard tool compatibility. The thread forming tapping method ensures optimal performance in wood substrates without pre-tapping requirements.