S-90289A575 5/16"-18 x 5/16" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with Black-Oxide finish, extending service life in harsh industrial environments
• Exceptional holding power achieved through Class 3A thread fit and coarse UNC threads for maximum grip in demanding applications
• Enhanced durability from Rockwell C45 hardness, providing reliable performance under high stress conditions
• Secure anti-rotation locking with serrations that prevent loosening from vibration and dynamic loads
• Easy installation and removal using standard 5/32" hex drive tools, reducing assembly time and maintenance costs
• Precision cup tip design ensures concentrated contact pressure for superior component positioning and alignment
• Environmental compliance with RoHS 3 and REACH regulations, meeting international safety standards for industrial use

Professional Applications & Engineering Value

This Black-Oxide alloy steel set screw delivers critical engineering solutions for industrial applications where vibration resistance and precise component positioning are paramount. The combination of Class 3A thread fit and UNC coarse threads provides exceptional clamping force, preventing slippage in high-torque assemblies. The headless design with hex drive allows for flush mounting in space-constrained applications, while the serrations locking feature effectively counters rotational forces in machinery, automotive, and manufacturing equipment. The cup tip configuration concentrates pressure on a small contact area, ensuring secure fastening of gears, pulleys, and collars without damaging shaft surfaces. These features make it ideal for permanent installations requiring reliable, maintenance-free performance in demanding industrial environments.

Specification Summary & Compliance

This set screw maintains precise Class 3A thread fit according to UNC standards, ensuring optimal engagement and holding capability. Manufacturing follows ASME B18.3 specifications for dimensional accuracy and performance reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming its suitability for global industrial applications. Additional specifications include right-hand thread direction, 5/16"-18 thread size with coarse spacing, and 5/16" length for consistent performance across standardized installations.