S-90390A131 3/8"-16 x 1 1/4" 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 T40 Torx drive design, reducing cam-out and tool slippage during installation
• Optimal material penetration with Type F thread cutting design that creates mating threads in aluminum, brass, cast iron and sheet metal
• Flush mounting capability with standard 82° countersink angle flat head for smooth surface finishes
• Reliable fastening performance through fully threaded coarse UNC spacing that maintains grip strength in various materials
• Simplified installation process with precise 0.358" drill bit requirement for proper hole preparation and thread engagement
• Versatile application range covering multiple industrial materials with right-hand threading for standard assembly procedures

Professional Applications & Engineering Value

These 3/8"-16 T40 flat head thread cutting screws deliver exceptional engineering value by solving critical fastening challenges in aluminum, brass, cast iron, and sheet metal applications. The black-phosphate steel construction provides essential corrosion protection while maintaining the structural integrity needed for industrial environments. The Type F tapping screw design with coarse UNC threading eliminates the need for pre-tapped holes, significantly reducing installation time and labor costs. The 82° countersink angle ensures flush mounting for safety and aesthetic requirements, while the T40 Torx drive prevents stripping during high-torque applications. These fully threaded screws offer consistent holding power across the entire 1-1/4" length, making them ideal for construction, manufacturing, and metal fabrication projects where vibration resistance and long-term reliability are paramount.

Specification Summary & Compliance

Manufactured to precise dimensional standards with UNC coarse thread specifications and Class 2A thread tolerances for consistent performance. These Type F thread cutting screws feature standard flat head profile with 82° countersink angle and require 0.358" drill bit (Size T) for proper installation. The right-hand threaded, fully threaded design complies with industrial fastening standards. Black-phosphate surface treatment provides corrosion resistance while meeting industry requirements for durable protective coatings in mechanical applications.