S-91381A709 5/8"-11 x 1/2" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide finish on alloy steel, extending service life in demanding industrial environments
• Enhanced component protection through integrated brass soft tip that prevents damage to mating surfaces during installation
• Maximum holding power achieved through Class 3A thread fit precision and coarse UNC threading for superior vibration resistance
• Optimized installation efficiency with 5/16" hex drive design allowing high torque application in confined spaces
• Reliable mechanical performance backed by Rockwell C28 hardness rating for consistent strength under load
• Broad regulatory compliance meeting ASME B18.3 specifications plus RoHS 3 and REACH environmental standards
• Versatile headless design enabling flush mounting in applications where protruding fasteners are not feasible

Professional Applications & Engineering Value

This 5/8"-11 UNC set screw delivers exceptional engineering value for industrial applications requiring precise component positioning and secure fastening. The black-oxide alloy steel construction provides superior corrosion resistance while maintaining the Rockwell C28 hardness necessary for high-strength applications. The integrated brass soft tip addresses common installation challenges by preventing damage to expensive machinery components and shafts, eliminating the need for additional protective measures. The Class 3A thread fit ensures tight tolerances for vibration-resistant assemblies in power transmission systems, manufacturing equipment, and precision machinery. The headless design with 5/16" hex drive allows installation in space-constrained applications where traditional fasteners cannot be used, making it ideal for collars, couplings, and pulley systems requiring reliable set screw performance.

Specification Summary & Compliance

Manufactured to exacting Class 3A thread fit standards with 5/8"-11 UNC coarse threading and right-hand thread direction. Complies with ASME B18.3 specifications for dimensional accuracy and performance requirements. Meets RoHS 3 (2015/863/EU) compliance for restricted substances and REACH (EC 1907/2006) regulations for chemical safety. Features precise dimensional specifications including 1/2" length, 5/16" hex drive, and specialized brass tip configuration (0.141" length, 0.375" diameter) for consistent performance across industrial applications.