S-90390A591 5/16"-18 x 2" Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-phosphate steel coating, extending service life in demanding industrial environments
• Enhanced torque transmission through T40 Torx drive design, reducing cam-out and tool wear during installation
• Efficient thread cutting action with Type F tapping design, creating strong threads in aluminum, brass, cast iron and sheet metal without pre-tapping
• Optimal flush mounting with 82° countersink angle and flat head profile, providing smooth surface finishes
• Reliable coarse thread engagement with UNC 5/16"-18 threading, ensuring quick installation and vibration resistance
• Full-length threading capability across the entire 2" length, maximizing grip strength in various material thicknesses
• Reduced material cracking with blunt tip design, minimizing stress concentration during thread formation

Professional Applications & Engineering Value

These thread cutting tapping screws are engineered specifically for challenging industrial applications where reliable fastening in non-ferrous metals and sheet materials is critical. The black-phosphate steel construction provides exceptional corrosion protection, while the T40 Torx drive system ensures maximum torque transfer without stripping, significantly reducing installation failures. The Type F thread cutting design with UNC coarse threads creates precise mating threads in aluminum, brass, cast iron, and sheet metal without requiring pre-tapped holes, streamlining assembly processes and reducing labor costs. The 82° countersink angle and flat head profile allow for flush mounting in precision applications, making these tapping screws ideal for manufacturing, metal fabrication, and equipment assembly where vibration resistance and long-term reliability are paramount.

Specification Summary & Compliance

Manufactured to precise dimensional standards with UNC coarse thread (5/16"-18) specifications and Class 2A thread tolerances for consistent performance. Features standard 82° countersink angle and T40 Torx drive compatibility. The black-phosphate surface treatment provides corrosion resistance while maintaining dimensional accuracy. These thread cutting tapping screws comply with industry standards for mechanical properties and are suitable for various industrial applications requiring reliable fastening solutions in metal substrates.