S-91375A880 7/8"-9 x 2 1/2" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Exceptional holding power with Class 3A thread fit for reliable, vibration-resistant fastening in high-stress applications
• Superior corrosion resistance from the black-oxide finish, extending service life in harsh industrial environments
• Optimized torque transmission via the 1/2" hex drive, allowing for secure installation without head protrusion
• Enhanced material durability with Rockwell C45 hardness, resisting wear and deformation under heavy loads
• Secure workpiece contact from the cup tip design, preventing loosening and minimizing surface damage
• Broad compatibility with coarse UNC threads for quick assembly and disassembly in general-purpose applications
• Regulatory peace of mind with full compliance to ASME B18.3, RoHS 3, and REACH standards

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers critical performance in machinery, automotive, and heavy equipment applications where vibration resistance and positional security are paramount. The headless design with 1/2" hex drive allows flush mounting in confined spaces, while the cup tip concentrates clamping force to prevent shaft or component slippage. Engineered with 7/8"-9 UNC coarse threads and Class 3A fit, it ensures rapid installation and high fatigue strength, reducing maintenance intervals. The Rockwell C45 hardness and protective coating combat wear and environmental exposure, making it ideal for industrial set screw uses demanding long-term reliability.

Specification Summary & Compliance

This set screw adheres to ASME B18.3 specifications (ASTM F912) with UNC coarse threads in 7/8"-9 size and Class 3A thread fit for precise dimensional accuracy. It is manufactured from alloy steel with a black-oxide surface treatment, and fully complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations.