S-91375A872 7/8"-9 x 1" 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 with Class 3A thread fit ensuring precise, vibration-resistant fastening in critical applications
• Maximum torque transmission through 1/2" hex drive design, preventing tool slippage during installation
• Enhanced material strength with Rockwell C45 hardness for reliable performance under heavy loads and stress
• Secure positioning capability with cup point tip that bites into mating surfaces to prevent component movement
• Industry-standard compatibility with 7/8"-9 UNC coarse threads for easy installation and replacement
• Regulatory compliance assurance meeting ASME B18.3 specifications and environmental standards including RoHS 3 and REACH

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers exceptional engineering value in demanding industrial applications where vibration resistance and positional accuracy are critical. The headless design with 1/2" hex drive provides flush mounting in confined spaces while enabling high torque application. The cup point tip creates permanent indentation in shaft components, preventing rotational slippage in pulley systems, gear assemblies, and coupling applications. Manufactured to ASME B18.3 specifications with Class 3A thread fit, this fastener maintains precise tolerances for secure fastening in heavy machinery, automotive systems, and industrial equipment. The corrosion-resistant black-oxide coating combined with Rockwell C45 hardness ensures long-term reliability in challenging environments where exposure to moisture and chemicals would compromise ordinary fasteners.

Specification Summary & Compliance

This set screw features 7/8"-9 UNC coarse threads with Class 3A precision fit for superior thread engagement and vibration resistance. The manufacturing process adheres to ASME B18.3 specifications where identified per ASTM F912 requirements. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental responsibility and workplace safety. The Rockwell C45 hardness rating guarantees consistent mechanical properties, while the black-oxide surface treatment provides additional corrosion protection for extended service life in industrial applications.