S-90390A115 1/4"-20 x 2 3/4" Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-phosphate steel coating for extended service life in demanding industrial environments
• Enhanced torque transmission through T30 Torx drive system, minimizing cam-out and tool slippage during installation
• Optimal material penetration with Type F thread cutting design that creates precise mating threads in aluminum, brass, cast iron and sheet metal
• Flush mounting capability featuring 82° countersink angle and flat head design for smooth, professional-looking finished surfaces
• Maximum holding power achieved through full-length UNC coarse threading along the entire 2-3/4" length
• Simplified installation process with pre-determined No. 1 drill bit size (0.228" diameter) for precise pilot hole preparation
• Reliable performance in right-hand thread applications with blunt tip design for controlled starting and reduced material displacement

Professional Applications & Engineering Value

These 1/4-20 T30 Torx flat head tapping screws deliver exceptional engineering value by solving common fastening challenges in metalworking applications. The black-phosphate steel construction provides superior corrosion protection while maintaining high tensile strength for heavy-duty applications. The Type F thread cutting design eliminates the need for pre-tapped holes, significantly reducing assembly time and labor costs when working with aluminum, brass, cast iron, and sheet metal. The 82° countersink angle ensures perfect flush mounting in standard chamfered holes, while the T30 Torx drive system prevents stripping and provides consistent torque transfer for reliable, repeatable installations in production environments.

Specification Summary & Compliance

These precision-engineered tapping screws feature 1/4"-20 UNC coarse threads with standard thread tolerances and full threading along the 2-3/4" length. The manufacturing conforms to industry standards for Type F thread cutting screws with right-hand thread direction and blunt tip configuration. Proper installation requires a No. 1 drill bit (0.228" diameter) for pilot holes. These industrial-grade fasteners meet quality specifications for material composition and dimensional accuracy, ensuring reliable performance in professional metal fabrication and assembly applications.