S-91375A592 5/16"-18 x 2 1/4" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating, extending service life in demanding industrial environments
• Exceptional thread precision with Class 3A fit ensures secure, vibration-resistant fastening in critical assemblies
• High-strength performance from alloy steel with Rockwell C45 hardness for reliable load-bearing capacity
• Optimized installation with 5/32" hex drive providing secure tool engagement and reduced stripping risk
• Enhanced grip stability from cup tip design that creates consistent seating pressure on shaft surfaces
• Industry-standard compatibility with UNC coarse threads for quick assembly and interchangeability
• Space-saving headless design allowing flush mounting in confined applications

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers critical performance in industrial settings where vibration resistance and corrosion protection are paramount. The Class 3A thread fit maintains precise tolerances under dynamic loads, preventing loosening in machinery, motor shafts, and power transmission systems. The cup tip configuration concentrates clamping force effectively, minimizing shaft damage while providing secure positioning for gears, pulleys, and collars. With Rockwell C45 hardness and 2-1/4" length, it withstands heavy-duty cycling in manufacturing equipment, automotive assemblies, and industrial automation where UNC coarse threads enable rapid installation and maintenance.

Specification Summary & Compliance

Manufactured to ASME B18.3 and ASTM F912 specifications with Class 3A thread fit for precision tolerance. Features 5/16"-18 UNC coarse threads with right-hand direction and 5/32" hex drive. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for industrial use.