S-91375A658 3/8"-24 x 3 1/2" 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 reliable, vibration-resistant fastening in critical assemblies
• High-strength performance from Rockwell C45 hardened alloy steel prevents stripping and deformation under heavy loads
• Secure hex drive engagement allows high torque application without cam-out, ideal for confined spaces
• Fine UNF threading provides enhanced adjustment precision and superior resistance to loosening
• Cup tip design creates positive seating and minimal surface damage on shafts and components
• Full regulatory compliance meets ASME B18.3, RoHS 3, and REACH standards for global industrial use

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers critical engineering solutions for permanent positioning applications where vibration resistance and corrosion protection are paramount. The Class 3A UNF fine threading maintains precise alignment in pulleys, gears, and collars, while the Rockwell C45 hardness ensures the hex drive withstands repeated adjustments without deformation. The headless design provides flush mounting in space-constrained assemblies, and the cup tip concentrates clamping force for secure shaft retention. Ideal for industrial machinery, automotive components, and precision equipment requiring reliable, long-term fastening performance.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with Class 3A thread fit precision and UNF 3/8"-24 fine threading. The black-oxide alloy steel construction provides consistent performance across 3.5" length. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations ensures safe use in global industrial applications.