S-91385A164 5/16"-24 x 1" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Permanent vibration resistance with nylon patch thread locker that maintains secure fastening in high-stress environments
• Superior corrosion protection through black-oxide coating on alloy steel, extending service life in demanding conditions
• Precise Class 3A thread fit ensures tighter tolerances and reliable engagement for critical assembly applications
• Exceptional temperature resilience with thread locker performing consistently from -50°F to 250°F
• High-strength durability backed by Rockwell C45 hardness for repeated adjustments without thread deformation
• Optimized torque transmission through 5/32" hex drive design, preventing tool slippage during installation
• Secure component positioning with cup point tip that bites into shafts for permanent alignment

Professional Applications & Engineering Value

Engineered for precision industrial applications, this black-oxide alloy steel set screw addresses critical challenges in machinery assembly and maintenance. The UNF fine thread configuration with Class 3A fit provides superior resistance to vibrational loosening in motors, gearboxes, and rotating equipment. The permanent nylon patch thread locker eliminates the need for secondary locking mechanisms while maintaining reliability across extreme temperature ranges from -50°F to 250°F. As a headless set screw with cup point design, it delivers maximum gripping force for shaft collars, pulleys, and couplings without protruding hardware, making it ideal for space-constrained assemblies where flush mounting is essential.

Specification Summary & Compliance

This 5/16"-24 x 1" set screw features Class 3A thread precision with UNF fine threads and right-hand thread direction. Manufactured to ASME B18.3 specifications with full compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The component meets ASTM F912 standards for quality assurance in industrial fastener applications.