S-90289A580 5/16"-18 x 5/8" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating, extending service life in harsh industrial environments
• Precise Class 3A thread fit ensures reliable, vibration-resistant fastening with minimal backlash
• High-strength Rockwell C45 hardness provides exceptional load-bearing capacity and wear resistance
• Hex drive design allows for high-torque installation in confined spaces with standard tools
• Cup tip configuration creates secure biting action on shaft surfaces without damaging components
• Serrations locking mechanism prevents rotational loosening under dynamic loading conditions
• Coarse UNC threading enables quick assembly and disassembly while maintaining holding power

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers critical performance in demanding applications where vibration resistance and corrosion protection are paramount. The Class 3A thread fit maintains precise tolerances for secure positioning of gears, pulleys, and collars on shafts, eliminating costly machinery downtime. The combination of Rockwell C45 hardness and serrations locking ensures permanent alignment in high-torque transmission systems, while the cup tip design provides maximum grip without creating stress concentrations. Ideal for industrial machinery, automotive components, and precision equipment requiring reliable set screw solutions that withstand aggressive operating conditions.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with Class 3A thread fit precision for consistent dimensional accuracy. Features 5/16"-18 UNC coarse threads with right-hand direction and 5/8" length. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.