S-91375A502 7/8"-14 x 3" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating that protects against rust and extends service life in harsh industrial environments
• Exceptional torque transmission through the 1/2" hex drive design, preventing tool slippage and ensuring secure fastening
• Precise thread engagement with Class 3A UNF fine threads that maintain tight tolerances for vibration-resistant assemblies
• Maximum material strength from Rockwell C45 hardened alloy steel, providing reliable performance under heavy loads
• Secure component positioning with the cup tip design that creates positive locking action on shafts and collars
• Space-saving installation due to the headless configuration, ideal for applications with limited clearance
• Regulatory compliance assurance meeting international standards for safety and environmental requirements

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers critical engineering solutions for industrial applications requiring high-strength fastening and vibration resistance. The 7/8"-14 UNF fine threads with Class 3A fit provide superior holding power in precision machinery, power transmission systems, and rotating assemblies where loosening under dynamic loads is a concern. The combination of Rockwell C45 hardness and black-oxide surface treatment ensures durability in demanding environments while the cup tip configuration creates positive engagement with mating components. These headless set screws are particularly valuable in aerospace, automotive, and heavy equipment applications where space constraints and reliability are paramount considerations for engineering teams.

Specification Summary & Compliance

This set screw maintains precision Class 3A thread fit according to UNF standards with 7/8"-14 fine thread spacing and 3" length. Manufacturing complies with ASME B18.3 specifications (ASTM F912) ensuring dimensional accuracy and performance reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, meeting current substance restriction requirements for international industrial applications.