S-91478A640 Length 4" 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 wood applications
• Enhanced torque transmission through the external hex head design, preventing cam-out and ensuring secure installation
• Stronger wood connections achieved through thread forming technology that compresses material rather than removing it
• Optimal thread engagement with 7 threads per inch and 2½" minimum thread length for maximum holding power
• Versatile partial threading allows for precise clamping force control and reduced wood splitting risk
• Heavy-duty construction capability with 4" length and 3/8" diameter for substantial wood joining applications
• Reliable compliance assurance meeting industry standards including ASME B18.2.1 for consistent quality and performance

Professional Applications & Engineering Value

These zinc-plated steel wood screws deliver exceptional engineering value for professional wood construction and fabrication. The thread forming design eliminates chip removal issues common in traditional tapping, creating compressed wood fibers that actually strengthen the connection points. This is particularly valuable in structural applications where vibration resistance and long-term integrity are critical. The external hex drive system provides superior torque capability compared to Phillips or slotted drives, reducing installation time and preventing driver slippage that can damage screw heads. With their 4" length and 3/8" diameter, these partially threaded screws are engineered for heavy timber construction, deck building, and framework where reliable, high-strength fastening is essential. The pointed tip facilitates precise starting position without pre-drilling in many applications.

Specification Summary & Compliance

These wood screws feature 3/8" diameter with 7 threads per inch in right-hand direction and 2½" minimum thread length. Manufactured to ASME B18.2.1 specifications ensuring dimensional accuracy and performance reliability. The fasteners are RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting current environmental and safety regulations for industrial use. The zinc-plated steel construction provides consistent corrosion protection while maintaining the mechanical properties required for demanding wood fastening applications.