S-90390A595 5/16"-18 x 3" Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-phosphate coating that protects against rust and extends service life in demanding environments
• Enhanced torque transmission through T40 Torx drive design, reducing cam-out and tool slippage during installation
• Efficient thread cutting with Type F tapping design that creates strong, precise threads in various materials without pre-tapping
• Optimal flush mounting with standard flat head profile and 82° countersink angle for smooth, secure surface finishes
• Versatile material compatibility specifically engineered for aluminum, brass, cast iron, and sheet metal applications
• Full threading design ensures maximum grip strength and uniform load distribution along the entire 3" length
• Reliable coarse UNC threading provides excellent holding power and resistance to vibration loosening

Professional Applications & Engineering Value

These black-phosphate steel tapping screws deliver exceptional performance 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 in aluminum, brass, cast iron, and sheet metal applications. The T40 Torx drive system ensures maximum torque transfer without stripping, while the 82° countersink angle provides a clean, flush finish that meets professional appearance standards. The 5/16"-18 UNC coarse thread configuration offers superior pull-out resistance in softer metals, making these flat head tapping screws ideal for construction, industrial equipment, and metal structure assemblies where vibration resistance and long-term reliability are critical.

Specification Summary & Compliance

Manufactured to precise dimensional standards with UNC coarse thread specifications and Class 2A thread tolerance for consistent performance. These Type F tapping screws are engineered for use with drill bit size L (0.29" diameter) and feature complete full threading along the 3" length. The black-phosphate surface treatment provides corrosion protection while maintaining compliance with industrial fastener standards. Product specifications align with common industry requirements for metal assembly applications and are manufactured following quality control protocols for dimensional accuracy and material integrity.