S-91375A885 5/16"-18 x 3/8" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior vibration resistance with Class 3A thread fit for secure, long-lasting fastening in high-stress applications
• Enhanced corrosion protection from zinc plating, extending service life in industrial environments
• High-strength performance with Rockwell C45 hardness alloy steel, preventing deformation under heavy loads
• Secure torque transmission via 5/32" hex drive, allowing precise installation without head interference
• Reliable positioning with cup tip design, minimizing component slippage in assemblies
• Wide compatibility with UNC coarse threads for quick installation and reduced cross-threading risks
• Regulatory compliance meeting ASME B18.3, RoHS 3, and REACH standards for global industrial use

Professional Applications & Engineering Value

This zinc plated alloy steel set screw delivers critical engineering solutions for permanent positioning in machinery, automotive, and manufacturing equipment. The headless hex drive design enables flush mounting in confined spaces while maintaining high torque capability. With UNC coarse threads and Class 3A thread fit, it ensures rapid assembly with minimal thread engagement issues. The cup tip configuration provides concentrated contact pressure, preventing shaft movement in pulleys, gears, and collars. Engineered for Rockwell C45 hardness, this fastener withstands repetitive stress while the zinc coating offers essential corrosion resistance in demanding industrial environments.

Specification Summary & Compliance

This set screw maintains Class 3A thread tolerance with UNC 5/16"-18 coarse threads and right-hand thread direction. Manufacturing conforms to ASME B18.3 specifications with full compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The 3/8" length and 0.313" thread diameter provide precise dimensional accuracy for consistent performance across industrial applications.