S-91478A556 Length 3 1/2" ASME B18.2.1 Wood Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction for long-lasting performance in demanding environments
• Maximum torque transfer through external hex drive design prevents stripping and ensures secure installation
• Enhanced holding power with thread forming technology that creates stronger, more reliable connections in wood
• Optimized load distribution through partial threading design that concentrates strength where needed most
• Easy installation and removal with standard hex head compatibility using common tools
• Precise dimensional accuracy meeting ASME B18.2.1 specifications for consistent performance and interchangeability
• Environmental compliance assurance with RoHS 3 and REACH certification for safe, regulated use

Professional Applications & Engineering Value

These 1/4"-10 zinc-plated steel wood screws are engineered to solve critical fastening challenges in wood construction and professional woodworking. The thread forming design eliminates the need for pre-drilling in many applications while creating stronger, more vibration-resistant connections by compressing wood fibers rather than removing material. The external hex drive provides superior torque transmission compared to other drive types, preventing cam-out and ensuring reliable installation in dense hardwoods and structural applications. The zinc plating offers essential corrosion protection for both indoor and outdoor wood projects, while the partially threaded shank allows for precise clamping force control. These features make them ideal for structural framing, furniture manufacturing, deck construction, and other demanding wood fastening scenarios where joint integrity is paramount.

Specification Summary & Compliance

Manufactured to exacting ASME B18.2.1 dimensional standards with 1/4" diameter and 10 threads per inch in the inch measurement system. Features include 3-1/2" overall length, 0.438" hex head width, and 2-1/4" minimum thread length. Fully compliant with RoHS 3 (2015/863/EU) restrictions on hazardous substances and REACH (EC 1907/2006) regulations for chemical safety. The thread forming tapping method and right-hand thread direction ensure proper installation according to industry standards for wood fastening applications.