S-91478A730 Length 4 1/2" 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 during high-tension installations
• Enhanced pull-out resistance with thread-forming tapping method that creates stronger mating threads in wood substrates
• Optimized load distribution through partial threading design, concentrating holding power where needed most
• Reduced splitting risk with pointed tip that guides screw placement without pre-drilling in most wood types
• Industry-standard compatibility with 3/4" head width matching standard wrench sizes for efficient installation
• Reliable performance verification through ASME B18.2.1 compliance ensuring dimensional accuracy and mechanical properties

Professional Applications & Engineering Value

These heavy-duty wood screws deliver exceptional engineering value for construction and industrial wood fastening applications. The zinc-plated steel construction provides critical corrosion protection in environments where moisture exposure could compromise fastener integrity. The thread-forming design eliminates the need for tapped holes while creating superior holding power in wood materials by compressing fibers rather than removing them. With 4-1/2" length and partial threading, these screws offer optimal clamp force distribution for timber construction, structural framing, and heavy wood assemblies. The external hex drive ensures maximum torque application without stripping, making them ideal for high-vibration environments where connection security is paramount. These features combine to solve common wood fastening challenges including joint separation, material splitting, and corrosion-induced failure.

Specification Summary & Compliance

Manufactured to ASME B18.2.1 dimensional standards with Class 2A thread tolerances for consistent performance. Features right-hand threads with 6 threads per inch and 0.5" diameter following inch system specifications. The 2 3/4" minimum thread length ensures sufficient engagement depth. Compliant with RoHS 3 (2015/863/EU) restrictions on hazardous substances and REACH (EC 1907/2006) regulations for chemical safety, verified against the latest SVHC list as of January 2023.