S-92505A639 1/4"-28 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 due to extended tip design that creates deeper engagement and prevents component slippage
• Precise Class 3A thread fit ensures tight tolerances and reliable performance in critical applications
• High-strength alloy steel construction with Rockwell C45 hardness provides excellent durability and wear resistance
• Easy installation and removal with hex drive design that accommodates standard tools and prevents stripping
• Reliable fine thread engagement with UNF 1/4"-28 configuration for secure fastening in precision assemblies
• Comprehensive regulatory compliance meeting RoHS 3 and REACH standards for global manufacturing requirements

Professional Applications & Engineering Value

This black oxide alloy steel set screw delivers exceptional performance in precision mechanical assemblies where vibration resistance and positional accuracy are critical. The extended tip design (0.156" diameter) creates deeper penetration into mating components, significantly enhancing grip strength and preventing rotational movement in shafts, collars, and pulleys. The Class 3A UNF fine threads provide superior engagement in tapped holes, while the hex drive configuration ensures reliable torque transmission without cam-out. Manufactured from alloy steel with Rockwell C45 hardness, this fastener maintains dimensional stability under heavy loads, making it ideal for industrial machinery, automotive components, and precision equipment where set screw reliability directly impacts operational safety and performance.

Specification Summary & Compliance

This 1/4"-28 UNF set screw features precision Class 3A thread fit with right-hand fine threads and exacting dimensional tolerances. The fastener meets ASME B18.3 specifications where applicable per ASTM F912, ensuring manufacturing consistency and performance reliability. Regulatory compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, confirming environmental responsibility and material safety for global industrial applications.