S-91375A641 3/8"-24 x 5/16" 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 harsh industrial environments
• Exceptional holding power thanks to the cup point design that creates deep indentations for maximum grip
• Precise Class 3A thread fit ensures tighter tolerances and more reliable fastening in critical applications
• High-strength performance with Rockwell C45 hardness providing excellent resistance to wear and deformation
• Easy installation and removal with 3/16" hex drive that prevents tool slippage and damage
• Space-saving headless design allows for flush mounting where protruding fasteners aren't feasible
• Regulatory compliance assurance meeting ASME B18.3 standards, RoHS 3, and REACH for global market acceptance

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers exceptional engineering value in precision applications where vibration resistance and reliable positioning are critical. The cup point design creates permanent indentations in the mating surface, providing superior anti-loosening capabilities that outperform standard set screws in high-vibration environments like machinery, automotive assemblies, and precision equipment. The UNF fine thread spacing offers more threads per inch compared to coarse threads, resulting in better adjustment precision and load distribution. Combined with the Class 3A thread fit, this fastener maintains tight tolerances essential for precision manufacturing, aerospace components, and medical equipment where minute movements can compromise system integrity. The headless configuration makes it ideal for confined spaces and rotating assemblies where protruding fastener heads would cause interference or safety hazards.

Specification Summary & Compliance

This precision 3/8"-24 UNF set screw features Class 3A thread fit for superior dimensional accuracy and meets ASME B18.3 specifications (ASTM F912) for consistent performance. The right-hand thread direction with fine thread spacing ensures optimal engagement in precision applications. Regulatory compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, making it suitable for global industrial markets with strict environmental requirements.