S-90390A123 5/16"-18 x 1 1/2" Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black phosphate steel coating, extending service life in harsh industrial environments
• Maximum torque transmission through T40 Torx drive, preventing cam-out and ensuring secure installation
• Excellent thread-cutting performance with Type F design, creating precise threads in aluminum, brass, cast iron and sheet metal without pre-tapping
• Optimized 82° countersink angle providing flush seating and clean finish in countersunk applications
• Reliable coarse UNC threading ensuring quick installation and strong holding power in various materials
• Full threading along 1-1/2" length delivering consistent grip strength throughout the fastener engagement
• Versatile material compatibility specifically engineered for use in aluminum, brass, cast iron and sheet metal applications

Professional Applications & Engineering Value

These 5/16"-18 thread cutting screws with Type F tapping design solve critical fastening challenges in metalworking and manufacturing. The black phosphate steel construction provides essential corrosion protection where environmental factors threaten fastener integrity. The T40 Torx drive system eliminates the stripping issues common with Phillips heads, ensuring reliable installation in high-torque applications. Engineered with UNC coarse threading and specialized cutting geometry, these screws form perfect mating threads in ductile materials like aluminum, brass, and cast iron without requiring pre-tapped holes. The 82° countersink angle matches standard chamfer tools, creating seamless flush finishes in sheet metal assemblies and industrial equipment where surface smoothness matters.

Specification Summary & Compliance

This flat head tapping screw features precise 5/16"-18 UNC coarse threads with standard Class 2A tolerance for reliable fit. The Type F thread cutting design follows established industrial standards for self-tapping fasteners. Manufacturing complies with relevant industrial specifications for tapping screws, while the black phosphate surface treatment meets corrosion resistance requirements for industrial applications. The product conforms to RoHS and REACH environmental directives, ensuring safe use across various manufacturing sectors.