S-91478A599 Length 4" ASME B18.2.1 Wood Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, ensuring long-term reliability in various environments.
• High-torque installation capability thanks to the external hex head design, allowing for secure fastening with standard tools.
• Exceptional holding power in wood due to the thread-forming tapping method, which reduces splitting and provides strong, permanent connections.
• Optimized for deep penetration with a 2 1/2" minimum thread length and pointed tip, ensuring quick starts and reduced driving effort.
• Reliable performance in heavy-duty applications with a 5/16" diameter and 4" length, ideal for demanding wood construction projects.
• Consistent fit and compatibility with 9 threads per inch and right-hand threading, meeting industry standards for predictable assembly.
• Reduced material stress from partial threading, minimizing the risk of wood damage while maintaining structural integrity.

Professional Applications & Engineering Value

These heavy-duty wood screws are engineered to address common challenges in wood construction, such as joint failure and material splitting. The zinc-plated steel material offers excellent corrosion protection, extending service life in both indoor and outdoor settings. With an external hex drive, they enable high torque application without cam-out, ensuring tight fastening in framing, decking, and furniture assembly. The thread-forming design creates precise, strong threads in wood, eliminating the need for pre-drilling in many cases and reducing installation time. This combination of partially threaded shank and pointed tip facilitates easy insertion and superior pull-out resistance, making them ideal for load-bearing structures where durability is critical.

Specification Summary & Compliance

This product adheres to ASME B18.2.1 specifications for dimensional accuracy and performance, ensuring reliable interchangeability. Threads are manufactured to standard right-hand direction with a diameter of 0.313" and approximately 9 threads per inch. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of hazardous substances and supporting environmental safety in industrial use.