S-90291A863 5/16"-18 ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior vibration resistance with durable Nylon 6/6 plastic tip that prevents loosening under dynamic loads
• Exceptional corrosion resistance from 18-8 stainless steel construction for long service life in harsh environments
• Precise thread engagement with Class 3A thread fit ensuring reliable, secure fastening in critical applications
• Broad temperature compatibility with nylon tip performing reliably from -50° to 250°F (-45° to 121°C)
• Enhanced surface protection through non-marring nylon tip that prevents damage to mating components
• Optimized installation torque with 5/32" hex drive providing secure tool engagement during assembly
• Industry-standard compliance meeting ASME B18.3 specifications for consistent quality and performance

Professional Applications & Engineering Value

This 5/16"-18 UNC Class 3A nylon tip set screw delivers exceptional engineering value in demanding industrial applications where vibration resistance and surface protection are critical. The 18-8 stainless steel construction provides excellent corrosion resistance, making it ideal for machinery, automotive components, and outdoor equipment exposed to harsh environments. The nylon 6/6 plastic tip offers superior vibration damping while preventing surface damage to shafts, gears, and precision components during installation and operation. With its coarse UNC thread spacing and precise Class 3A thread fit, this headless set screw ensures reliable positioning and secure fastening in high-vibration applications, reducing maintenance requirements and improving overall system reliability. The combination of Rockwell B80 hardness and temperature-resistant tip material makes it suitable for diverse operating conditions across manufacturing, automation, and mechanical assembly sectors.

Specification Summary & Compliance

This set screw features precision 5/16"-18 UNC coarse threads with Class 3A thread fit for superior dimensional accuracy and engagement. Manufactured in compliance with ASME B18.3 standards for consistent quality and performance. The product meets RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) regulations for environmental safety. Additional specifications include right-hand thread direction, 5/32" hex drive, and headless design optimized for flush mounting applications.