S-90390A112 1/4"-20 x 1/2" Tapping Screws

Key Features & Benefits at a Glance

• Superior thread cutting performance with Type F tapping design for reliable installation in aluminum, brass, cast iron, and sheet metal without pre-tapping
• Enhanced corrosion resistance through black-phosphate steel construction, extending service life in demanding industrial environments
• Secure Torx T30 drive system provides superior torque transmission and reduces cam-out risk compared to conventional drive types
• Optimized 82° countersink angle ensures flush mounting and clean finished appearance in countersunk applications
• Full threading along entire 1/2" length delivers maximum holding power and uniform stress distribution
• Coarse UNC 1/4"-20 thread pattern enables faster installation and superior performance in softer materials
• Precision flat head design with standard profile for seamless integration where flush surface mounting is required

Professional Applications & Engineering Value

This black-phosphate steel thread cutting screw addresses critical challenges in metal fabrication and assembly operations. The Type F thread cutting design eliminates the need for separate tapping operations, significantly reducing installation time and labor costs when working with aluminum, brass, cast iron, and sheet metal. The T30 Torx drive system provides exceptional torque transfer capability, minimizing fastener damage during high-torque applications while the 82° countersink angle ensures perfect flush mounting in precision applications. Engineered with coarse UNC 1/4"-20 threads, these screws deliver superior pull-out resistance in softer materials while the fully threaded design maximizes engagement strength across the entire fastener length.

Specification Summary & Compliance

This 1/4"-20 UNC thread cutting screw features precision coarse threading with standard thread tolerances and Type F tapping screw specifications. Manufactured from black-phosphate coated steel for enhanced corrosion protection, the fastener includes a standard flat head profile with 82° countersink angle and requires a #1 drill bit (0.228" diameter) for proper installation. The screw complies with industry standards for thread cutting screws and is designed for right-hand thread direction with full threading along its 1/2" length.