S-91375A649 3/8"-24 x 1 1/4" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating, extending service life in demanding industrial environments
• Precise Class 3A thread fit ensures tight tolerances and reliable fastening in critical applications
• High-strength Rockwell C45 hardness provides exceptional durability and resistance to deformation under load
• Hex drive design allows for secure installation and removal with standard tools, preventing slippage
• Cup tip configuration creates positive seating and prevents damage to shaft surfaces during clamping
• Fine UNF thread spacing delivers enhanced vibration resistance and superior holding power
• Headless construction enables flush mounting in space-constrained applications

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers exceptional performance in precision mechanical assemblies where vibration resistance and corrosion protection are critical. The Class 3A thread fit maintains tight tolerances for secure fastening in high-stress applications, while the cup tip design prevents shaft damage during repeated adjustments. Engineered with Rockwell C45 hardness, it withstands heavy loads without deformation, making it ideal for industrial machinery, power transmission systems, and precision equipment where reliable positioning is essential. The hex drive ensures straightforward installation in confined spaces, reducing assembly time while maintaining consistent clamping force.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with Class 3A thread fit precision and UNF fine thread spacing. This set screw features a 3/8"-24 thread size with right-hand thread direction and measures 1-1/4" in length. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors.