S-91385A163 5/16"-24 x 3/4" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking with permanent nylon patch thread locker that maintains integrity from -50°F to 250°F
• Superior corrosion protection through black-oxide coating on alloy steel for extended service life
• Precise thread engagement with Class 3A UNF fine threads ensuring tight, reliable fastening
• High-strength performance backed by Rockwell C45 hardness for demanding industrial applications
• Easy installation and removal with 5/32" hex drive in headless design for confined spaces
• Secure component positioning through cup tip design that provides excellent grip on mating surfaces
• Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers exceptional engineering value in applications where vibration resistance and precise component positioning are critical. The permanent nylon patch thread locker eliminates the need for secondary locking mechanisms while maintaining performance across extreme temperature ranges from -50°F to 250°F. The Class 3A UNF fine thread configuration ensures superior thread engagement and clamping force in precision assemblies, while the cup tip design provides maximum contact pressure for secure shaft positioning in pulleys, gears, and collars. The headless construction with hex drive allows for installation in confined spaces commonly found in machinery, automotive, and industrial equipment where reliable, permanent fastening solutions are essential for operational safety and reduced maintenance intervals.

Specification Summary & Compliance

This 5/16"-24 x 3/4" set screw features precision Class 3A thread fit with UNF fine thread specification, ensuring exact dimensional accuracy for critical applications. Manufactured to ASME B18.3 standards with Rockwell C45 hardness for consistent mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, providing assurance for use in regulated industries and international markets.