S-92311A399 5/8"-18 x 1 1/4" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh environments and extended service life
• Exceptional holding power from Class 3A thread fit, ensuring tight, secure fastening with minimal backlash
• Optimized grip and minimal surface damage thanks to the cup tip design, distributing pressure evenly
• High mechanical strength with Rockwell B80 hardness, resisting deformation under heavy loads
• Easy installation in confined spaces using the headless hex drive design with 5/16" drive size
• Reliable fine thread engagement with 5/8"-18 UNF threads, providing greater adjustment precision
• Broad regulatory compliance meeting ASME B18.3, RoHS 3, and REACH standards for safe, quality-assured use

Professional Applications & Engineering Value

This 5/8"-18 UNF Class 3A set screw delivers critical performance in demanding industrial settings where vibration resistance and precise component alignment are paramount. Crafted from 18-8 stainless steel, it combats corrosion in moisture-rich or chemical-exposed applications, reducing maintenance frequency. The headless hex drive and fine thread spacing allow for compact installation and superior clamping force in machinery, automotive assemblies, and precision equipment. The cup tip minimizes shaft marring while maximizing torque transmission, making it an engineering solution for permanent or semi-permanent fixturing without compromising part integrity.

Specification Summary & Compliance

This set screw adheres to ASME B18.3 specifications, with a Class 3A thread fit for high-precision applications and a UNF fine thread (5/8"-18). It features a right-hand thread direction, 1-1/4" length, and 5/16" hex drive. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions are met for global industrial use.