S-91375A602 5/16"-24 x 3/4" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating that protects against rust in demanding industrial environments
• Exceptional thread precision with UNF Class 3A fine threads ensuring tight, secure connections in critical applications
• High-strength performance backed by Rockwell C45 hardness for reliable, long-lasting fastening under heavy loads
• Secure installation with hex drive design providing maximum torque transfer and preventing tool slippage
• Positive locking action from cup point tip that bites into mating surfaces to prevent component movement
• Space-saving design as a headless set screw ideal for applications with limited clearance
• Regulatory compliance meeting ASME B18.3 specifications for guaranteed dimensional accuracy and performance

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers exceptional engineering value in precision industrial applications where vibration resistance and positional security are critical. The UNF Class 3A fine threads provide superior engagement in tapped holes, minimizing the risk of stripping while maintaining precise alignment in machinery components, automotive assemblies, and precision equipment. The cup point design creates permanent indentation in shaft surfaces, effectively preventing rotational slippage in pulley systems, gear assemblies, and coupling applications. Combined with the hex drive configuration, this set screw ensures reliable installation in confined spaces where traditional headed fasteners cannot be accommodated, making it ideal for permanent positioning applications across manufacturing, aerospace, and heavy equipment industries.

Specification Summary & Compliance

This precision fastener features 5/16"-24 UNF Class 3A threads with fine thread spacing, manufactured to exacting ASME B18.3 specifications for dimensional accuracy. The component maintains full compliance with RoHS 3 (2015/863/EU) environmental directives and REACH (EC 1907/2006) regulations regarding substance restrictions. Manufactured from alloy steel with Rockwell C45 hardness certification, this set screw meets industrial standards for mechanical properties and performance reliability in demanding applications.