S-91385A622 3/8"-16 x 3/4" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Permanent vibration resistance with integrated nylon patch thread locker that maintains secure fastening without loosening
• Exceptional durability from Rockwell C45 hardened black-oxide alloy steel that resists wear and corrosion in demanding environments
• Reliable performance across extreme temperatures with thread locker effectiveness maintained from -50°F to 250°F
• Precise installation and removal through hex drive design that provides superior torque transmission and tool engagement
• Superior grip and positioning with cup point tip that digs into mating surfaces for permanent component alignment
• Consistent thread quality with UNC Class 3A coarse threads ensuring reliable engagement and reduced cross-threading risk
• Space-saving headless design allowing flush mounting where protruding fasteners aren't feasible

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers critical vibration resistance for industrial machinery, automotive components, and precision equipment where permanent fastening is essential. The nylon patch thread locker eliminates the need for separate locking compounds while maintaining reliability across temperature extremes from -50°F to 250°F. Engineered with UNC Class 3A coarse threads and cup point design, it provides maximum biting action into shafts, collars, and pulleys, preventing rotational slippage under heavy loads. The headless configuration with hex drive enables installation in confined spaces while ensuring sufficient torque application during assembly and maintenance cycles.

Specification Summary & Compliance

Manufactured to ASME B18.3 and ASTM F912 specifications with UNC Class 3A thread fit ensuring precision dimensional accuracy. Features 3/8"-16 coarse threads, 3/4" length, and 3/16" hex drive. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for industrial use worldwide.