S-91087A129 1/4"-20 x 1 3/4" Wood Screws

Key Features & Benefits at a Glance

• Superior torque transfer with T30 Torx drive prevents cam-out and tool slippage, ensuring secure installation in demanding applications
• Enhanced corrosion resistance from black-phosphate steel coating provides durable protection in various environmental conditions
• Excellent holding power through UNC coarse threading and full threading design creates strong, reliable fastening in wood and sheet metal
• Streamlined installation with standard flat head profile and 82° countersink angle allows for flush mounting without protruding hardware
• Reduced preparation time with thread-forming design eliminates the need for pre-tapped holes in appropriate materials
• Precise compatibility with No. 3 drill bit (0.213") ensures proper pilot hole sizing for optimal thread engagement
• Regulatory confidence with RoHS 3 and REACH compliance meets international environmental and safety standards

Professional Applications & Engineering Value

Engineered for demanding wood and sheet metal applications, these black-phosphate steel screws deliver exceptional performance where vibration resistance and long-term reliability are critical. The T30 Torx drive system provides superior torque transmission compared to traditional drive types, eliminating stripped heads and reducing installation time in production environments. The UNC coarse thread profile combined with thread-forming technology creates tight, secure fastenings without requiring pre-tapped holes, making them ideal for high-volume assembly operations. The flat head design with 82° countersink ensures clean, flush finishes in furniture manufacturing, structural wood framing, and metal fabrication projects where appearance and safety are paramount.

Specification Summary & Compliance

This 1/4"-20 UNC coarse thread screw maintains standard Class 2A thread tolerances for consistent performance. The fully threaded 1-3/4" length provides maximum engagement strength, while the blunt tip facilitates proper alignment during installation. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and workplace safety. Proper installation requires a No. 3 drill bit (0.213" diameter) for pilot holes and standard 82° countersinking tools for flush mounting applications.