S-91520A171 Length 3" Wood Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black phosphate steel coating for long-lasting performance in demanding wood and composite applications
• Enhanced torque transfer through square drive design prevents cam-out and reduces tool slippage during installation
• Optimized material engagement with partial threading design provides maximum holding power while minimizing material splitting
• Efficient thread forming technology creates strong, permanent threads in wood and plastic-wood composites without pre-tapping
• Precision installation with pointed tip and recommended 5/64" drill bit ensures accurate positioning and reduced installation effort
• Reliable fastening performance with 15 threads per inch and 1-1/2" thread length delivers consistent, high-strength connections
• Streamlined profile with narrow flat head design sits flush with material surfaces for clean, professional finishes

Professional Applications & Engineering Value

These No. 8 wood screws are engineered specifically for demanding wood and plastic-wood composite applications where traditional fasteners often fail. The black phosphate steel construction provides exceptional corrosion protection, extending service life in environments where moisture or chemical exposure is a concern. The thread forming design eliminates the need for pre-tapped holes while creating stronger, more durable connections by compressing material fibers rather than cutting them. This is particularly valuable in composite materials where thread integrity is critical. The square drive system delivers superior torque transmission, reducing installation time and preventing driver slippage that can damage screw heads and work surfaces. With partial threading and optimized 15 threads per inch configuration, these screws provide maximum pull-out resistance while minimizing the risk of material splitting in delicate wood applications.

Specification Summary & Compliance

These wood screws feature precision right-hand threading with 0.164" thread diameter and 15 threads per inch, manufactured to industry-standard tolerances for consistent performance. The flat head design with narrow profile and No. 2 square drive ensures proper seating and torque application. With a total length of 3" and minimum thread length of 1-1/2", these screws are engineered for optimal engagement in various material thicknesses. The pointed tip facilitates easy starting, while the recommended 5/64" drill bit size (0.078" diameter) ensures proper pilot hole preparation. Manufactured from high-quality steel with black phosphate coating for enhanced durability and corrosion resistance, these fasteners meet industry standards for wood and composite material applications.