S-90390A114 1/4"-20 x 1 3/4" Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-phosphate steel coating for extended service life in harsh industrial environments
• Enhanced torque transmission through T30 Torx drive design, reducing cam-out and tool slippage during installation
• Excellent thread cutting performance with Type F tapping design for secure fastening in aluminum, brass, cast iron, and sheet metal
• Optimal countersinking capability with 82° flat head profile for flush mounting and clean finished appearance
• Reliable coarse thread engagement with UNC 1/4"-20 threading for quick installation and strong holding power
• Full-length threading ensures maximum thread contact and superior load distribution along the entire fastener length
• Precision dimensional consistency maintains proper fit and function across all your industrial applications

Professional Applications & Engineering Value

These black-phosphate steel tapping screws with T30 Torx drive are engineered to solve critical fastening challenges in metalworking applications. The thread cutting design (Type F) eliminates the need for pre-tapped holes, significantly reducing installation time and labor costs in aluminum, brass, cast iron, and sheet metal assemblies. The UNC coarse thread provides excellent chip clearance during installation, preventing binding in dense materials. The 82° countersink angle ensures proper seating in standard countersunk holes, creating flush surfaces that minimize snagging hazards in industrial equipment. These fully threaded screws deliver consistent clamping force across the entire engagement length, making them ideal for vibration-resistant applications where joint integrity is critical.

Specification Summary & Compliance

Manufactured to precise dimensional standards with UNC 1/4"-20 coarse thread specifications and standard Class 2A thread tolerances. Features Type F thread cutting design with right-hand threading and blunt tip configuration. The black-phosphate surface treatment provides corrosion protection while maintaining dimensional accuracy. These industrial fasteners comply with relevant industry standards for tapping screws and are suitable for use in various metal fabrication applications requiring reliable, high-performance fastening solutions.