S-91375A809 5/8"-11 x 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 harsh industrial environments
• Exceptional thread precision with Class 3A fit ensuring reliable, vibration-resistant fastening in high-stress applications
• Maximum torque transmission through 5/16" hex drive design, preventing tool slippage during installation
• Enhanced material strength from Rockwell C45 hardened alloy steel, maintaining dimensional stability under heavy loads
• Optimized grip performance with cup tip design that creates secure contact points without damaging mating surfaces
• Industry-standard compatibility through UNC coarse threading, enabling quick installation and interchangeability
• Regulatory compliance assurance meeting ASME B18.3, ASTM F912, RoHS 3 and REACH standards for global project suitability

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers critical engineering solutions for industrial machinery, automotive components, and heavy equipment assemblies. The Class 3A thread fit provides superior vibration resistance in dynamic applications, while the Rockwell C45 hardness maintains structural integrity under repetitive stress cycles. The headless design with hex drive enables flush mounting in confined spaces, and the cup tip ensures positive seating without surface marring. Ideal for permanent positioning of gears, pulleys, and collars on shafts, this 5/8"-11 UNC coarse thread fastener combines installation efficiency with long-term reliability in demanding environments.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with Class 3A thread tolerance for precision fit. Features UNC coarse thread (5/8"-11) with right-hand direction and 4" length. Complies with ASTM F912 material standards, RoHS 3 (2015/863/EU) for hazardous substance restriction, and REACH (EC 1907/2006) regulations for chemical safety.