S-90669A576 5/16"-18 x 3/8" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments
• Enhanced surface protection through the integrated brass soft tip, preventing damage to mating components
• Precise and secure fastening ensured by the Class 3A thread fit for high-vibration applications
• High mechanical strength with Rockwell B80 hardness, providing reliable long-term holding power
• Easy installation and removal using the 5/32" hex drive, even in confined headless designs
• Wide compatibility with coarse UNC 5/16"-18 threads, suitable for standard industrial assemblies
• Regulatory compliance meeting ASME B18.3, RoHS, and REACH standards for global supply chain integration

Professional Applications & Engineering Value

This 5/16"-18 UNC set screw is engineered to address critical challenges in industrial machinery, automotive systems, and precision equipment. The 18-8 stainless steel material provides excellent resistance to rust and chemical exposure, while the Class 3A thread fit ensures minimal backlash and reliable performance under dynamic loads. The brass soft tip is a key feature that prevents marring or deformation of shafts, gears, and collars, maintaining the integrity of expensive components. Its headless design with hex drive allows for flush mounting in tight spaces, making it ideal for adjustable assemblies and permanent positioning applications where vibration resistance and repeatability are paramount.

Specification Summary & Compliance

This set screw adheres to Class 3A thread tolerance per UNC standards, ensuring precise engagement and consistent clamping force. Manufacturing and dimensional requirements strictly follow ASME B18.3 specifications. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted hazardous substances and supporting environmentally responsible procurement.