S-91375A110 4-40 x 1/2" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating for extended service life in demanding industrial environments
• Exceptional holding power achieved through Class 3A thread fit precision and Rockwell C45 hardness
• Secure installation and removal with hex drive design preventing tool slippage during high-torque applications
• Enhanced grip and alignment from cup tip design that minimizes component movement in assembled products
• Reliable coarse threading (UNC) providing faster installation and reduced cross-threading risks
• Headless configuration enabling flush mounting in space-constrained applications
• Industry compliance assurance meeting ASME B18.3 specifications for consistent performance

Professional Applications & Engineering Value

This 4-40 UNC set screw delivers critical engineering solutions for precision assembly applications where vibration resistance and permanent positioning are paramount. The black-oxide alloy steel construction provides essential corrosion protection while maintaining the Rockwell C45 hardness required for repeated tightening without deformation. The cup tip type creates concentrated pressure points that securely lock components against shafts and axles, preventing rotational slippage in machinery, motor assemblies, and precision instruments. The hex drive configuration ensures reliable torque transmission during installation, while the headless design allows for seamless integration in compact spaces where protruding fasteners are not feasible.

Specification Summary & Compliance

This set screw maintains Class 3A thread fit tolerances with 4-40 UNC coarse threading and 1/2" length dimensions. Manufactured to ASME B18.3 specifications with 0.050" hex drive and right-hand thread direction. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors.