S-91375A811 5/8"-18 x 1/2" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from black-oxide coating, extending service life in harsh industrial environments
• Exceptional thread precision with Class 3A fit ensures secure, vibration-resistant fastening in critical applications
• High-strength performance from alloy steel with Rockwell C45 hardness for reliable load-bearing capability
• Optimized torque transmission through 5/16" hex drive design, preventing tool slippage during installation
• Secure component positioning with cup tip design that minimizes surface damage while maintaining firm grip
• Fine thread advantage (18 TPI) provides enhanced adjustment precision and superior resistance to loosening
• Space-saving headless design allows flush mounting where clearance is limited

Professional Applications & Engineering Value

This black-oxide alloy steel set screw addresses critical engineering challenges in industrial machinery, automotive systems, and precision equipment. The Class 3A thread fit combined with UNF fine threading (5/8"-18) delivers exceptional vibration resistance, preventing accidental loosening in high-stress applications. The headless hex drive configuration enables installation in confined spaces while maintaining full torque capability. The cup tip design concentrates clamping force effectively without damaging shaft surfaces, making it ideal for permanent positioning of gears, pulleys, and collars. The Rockwell C45 hardness ensures the screw maintains its mechanical properties under continuous load, while the black-oxide surface treatment provides reliable corrosion protection in demanding environments.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications and ASTM F912 standards, this set screw maintains precise Class 3A thread fit tolerances for superior engagement. The product is fully compliant with RoHS 3 (2015/863/EU) environmental directives and REACH (EC 1907/2006) regulations regarding hazardous substances. Critical dimensions include 5/8"-18 UNF fine threads, 1/2" length, and 5/16" hex drive size, ensuring interchangeability and reliable performance across industrial applications.