S-92311A584 5/16"-18 x 1 1/4" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction for long-lasting performance in harsh environments
• Exceptional holding power achieved through Class 3A thread fit precision for secure, vibration-resistant fastening
• Optimized installation efficiency with 5/32" hex drive design allowing high torque application without stripping
• Enhanced grip and minimal surface damage thanks to the cup point tip design that concentrates pressure effectively
• Reliable mechanical strength with Rockwell B80 hardness providing excellent durability under load
• Simplified assembly process using coarse UNC threads for quick installation and reduced cross-threading risk
• Full regulatory compliance meeting ASME B18.3 standards and environmental regulations for global industrial use

Professional Applications & Engineering Value

This 5/16"-18 UNC set screw delivers critical engineering solutions for industrial applications requiring permanent, high-strength fastening. The 18-8 stainless steel composition provides excellent corrosion resistance, making it ideal for machinery, automotive components, and outdoor equipment exposed to moisture and chemicals. The Class 3A thread fit ensures precise engagement with mating parts, eliminating play and preventing loosening under vibration—a common failure point in rotating assemblies. The headless design allows flush mounting in confined spaces, while the hex drive facilitates secure installation with standard tools. Particularly valuable for shaft collars, gears, and pulleys where cup point penetration creates positive locking without damaging components, this set screw addresses the critical need for reliable positioning in power transmission systems.

Specification Summary & Compliance

This set screw maintains Class 3A thread tolerances per UNC standards with 5/16"-18 coarse thread spacing and right-hand threading. Manufacturing conforms to ASME B18.3 specifications for dimensional accuracy and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and unrestricted use in industrial markets worldwide.