S-95289A403 5/16"-18 x 3/8" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black oxide finish on alloy steel, extending service life in demanding environments
• Exceptional holding power from extended tip design (0.164") that creates deeper engagement and prevents component slippage
• Precision thread fit with Class 3A tolerance ensuring reliable, vibration-resistant fastening in critical applications
• Optimized installation torque through 5/32" hex drive that prevents tool slippage and reduces assembly time
• Enhanced mechanical strength with Rockwell C45 hardness maintaining dimensional stability under heavy loads
• Industry-standard compatibility with 5/16"-18 UNC coarse threads for easy replacement and interchangeability
• Headless design advantage allowing flush mounting in space-constrained assemblies without protruding components

Professional Applications & Engineering Value

This black oxide alloy steel set screw addresses critical engineering challenges in industrial machinery, automotive components, and precision equipment. The Class 3A thread fit provides exceptional dimensional accuracy that prevents backlash in vibrating systems, while the extended tip design penetrates deeper into mating surfaces for permanent positioning of gears, pulleys, and collars. The headless configuration enables seamless integration where clearance is limited, and the 5/32" hex drive ensures consistent torque application without cam-out. Manufactured to ASME B18.3 specifications, these UNC coarse thread set screws deliver reliable performance in high-stress applications where component security is paramount.

Specification Summary & Compliance

This set screw maintains Class 3A thread fit per UNC standards with precise dimensional control (tip length tolerance: -0.005" to 0", tip diameter tolerance: -0.008" to 0"). Manufacturing complies with ASME B18.3 specifications (ASTM F912) for consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and workplace safety standards are met for global industrial applications.