S-91375A637 3/8"-16 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 demanding industrial environments
• Superior holding power from Rockwell C45 hardness, preventing deformation under high torque applications
• Precise Class 3A thread fit ensuring secure fastening with minimal backlash in critical assemblies
• Deep hex socket drive providing maximum torque transmission and reduced tool slippage
• Cup point design creating positive seating and resistance to vibrational loosening
• Comprehensive regulatory compliance meeting ASME, RoHS 3, and REACH standards for global project acceptance
• Coarse UNC threading enabling quick installation and reduced cross-threading risks

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers critical performance where vibration resistance and corrosion protection are paramount. The headless design with hex socket drive provides flush mounting in confined spaces while maintaining high torque capability. Engineered with Class 3A UNC coarse threads, it ensures rapid assembly in production environments and reliable seating in shaft collars, gears, and pulleys. The cup point tip bites securely into mating surfaces, preventing component slippage in high-vibration machinery. This combination of material properties and precision threading solves common industrial challenges of fastener loosening and environmental degradation.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with ASTM F912 material standards. Features 3/8"-16 UNC coarse threads with Class 3A precision fit and 3½" length. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The Rockwell C45 hardness ensures dimensional stability under load, while the black-oxide surface treatment provides consistent corrosion protection.