S-91375A329 1/4"-28 x 7/8" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating, extending service life in harsh industrial environments
• Exceptional thread precision with Class 3A fit ensuring reliable, vibration-resistant fastening in critical assemblies
• High-strength performance backed by Rockwell C45 hardness for maximum durability under heavy loads
• Secure installation through hex drive design providing superior torque transmission and slip resistance
• Precise component positioning with cup point tip that bites into shafts for permanent, non-slip alignment
• Industry-standard compatibility with UNF fine threads (1/4"-28) for seamless integration into existing assemblies
• Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards for global market acceptance

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers exceptional engineering value in demanding industrial applications where precision and reliability are paramount. The Class 3A thread fit provides superior dimensional accuracy, eliminating play and preventing loosening in high-vibration environments such as rotating machinery, automotive assemblies, and precision equipment. The cup point design creates permanent seating by biting into shaft materials, ensuring components maintain precise alignment without slippage. Combined with Rockwell C45 hardness and corrosion-resistant black-oxide finish, this hex drive set screw offers long-term performance in applications ranging from power transmission systems to manufacturing fixtures, where repeated adjustments and extreme conditions would compromise inferior fasteners.

Specification Summary & Compliance

This precision set screw features 1/4"-28 UNF fine threads with Class 3A tolerance for exceptional dimensional accuracy, manufactured to ASME B18.3 specifications (ASTM F912). The component is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and global market acceptance. The right-hand thread direction and 7/8" length provide standardized installation compatibility across industrial applications.