S-91375A515 1"-8 x 3 1/2" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with black-oxide coating, extending service life in harsh industrial environments.
• Superior holding power from Class 3A thread fit, ensuring precise, vibration-resistant fastening in critical assemblies.
• High-strength durability with Rockwell C45 hardened alloy steel, preventing deformation under heavy loads.
• Reliable installation torque via 9/16" hex drive, enabling secure tightening without slippage in confined spaces.
• Optimized grip and alignment with cup tip design, minimizing component damage during clamping applications.
• Broad compatibility with UNC coarse threads, facilitating quick assembly and disassembly in standard inch-system components.
• Regulatory peace of mind through compliance with RoHS 3 and REACH, meeting global environmental and safety standards.

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers critical performance in demanding mechanical systems where vibration loosening and corrosion pose operational risks. The 1"-8 UNC coarse thread with Class 3A fit maintains tight tolerances in pulleys, gears, and collars, resisting backlash in high-torque environments. Its headless design and cup tip concentrate clamping force without protruding, ideal for rotating shafts and precision machinery. The Rockwell C45 hardness ensures the hex drive withstands repeated tool engagement, while the oxide surface resists humidity and chemicals in manufacturing, automotive, and heavy equipment applications.

Specification Summary & Compliance

Manufactured to ASME B18.3 and ASTM F912 specifications, this set screw guarantees dimensional accuracy with Class 3A thread fit and UNC coarse threading. The 1" diameter and 3 1/2" length adhere to inch-system standards, complemented by full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations for hazardous substance restrictions.