S-90390A128 5/16"-18 x 6" Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-phosphate steel coating, extending service life in demanding environments
• Enhanced torque transmission and reduced cam-out with T40 Torx drive for reliable, high-torque installations
• Efficient thread cutting action with Type F design creates strong threads in materials like aluminum and cast iron without pre-tapping
• Optimized for various materials including sheet metal, brass, aluminum, and cast iron for versatile application use
• Secure flush mounting with standard 82° flat head and countersink angle for a clean, professional finish
• Reliable partial threading provides maximum unthreaded shank strength while ensuring sufficient thread engagement
• Precise installation guidance with specified 0.29" drill bit size for proper hole preparation and optimal performance

Professional Applications & Engineering Value

These 5/16"-18 UNC thread tapping screws deliver exceptional value in industrial fastening applications where material integrity and corrosion resistance are critical. The black-phosphate steel construction provides superior protection against oxidation, making these Type F thread cutting screws ideal for aluminum assemblies, brass components, cast iron machinery, and sheet metal fabrication. The T40 Torx drive system ensures maximum torque transfer without stripping, while the 82° countersink angle and flat head profile create seamless surfaces in professional installations. The 6" length with partial threading offers the perfect balance of grip range and shank strength, solving common challenges of thread stripping and material deformation in demanding construction and manufacturing environments.

Specification Summary & Compliance

These industrial-grade fasteners feature 5/16"-18 UNC coarse threads with standard Class 2A tolerance for reliable engagement. The Type F thread cutting design follows established industrial standards for self-tapping applications. Manufacturing complies with relevant industrial specifications for dimensional accuracy, including 0.313" thread diameter, 0.597" head diameter, and 4" minimum thread length. The black-phosphate surface treatment meets industry requirements for corrosion protection, while the materials and manufacturing processes adhere to RoHS and REACH environmental compliance standards for industrial components.