S-90291A864 5/16"-18 ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking with green nylon 6/6 plastic tip that prevents loosening under dynamic loads
• Superior corrosion resistance from 18-8 stainless steel construction for long service life in harsh environments
• Precise thread engagement with Class 3A fit ensuring reliable fastening in demanding applications
• Wide temperature tolerance (-50° to 250°F) maintaining performance across extreme operating conditions
• Easy installation and removal with 5/32" hex drive providing secure tool engagement
• Surface protection through headless design that minimizes protrusion and damage risks
• Industry compliance meeting ASME B18.3 specifications for consistent quality and performance

Professional Applications & Engineering Value

This 5/16"-18 UNC hex headless set screw delivers exceptional engineering value in industrial applications where vibration resistance and corrosion protection are critical. The 18-8 stainless steel construction combined with Class 3A thread fit ensures precise positioning and reliable clamping force in machinery, automotive components, and precision equipment. The green nylon 6/6 plastic tip provides mar-free fastening while preventing thread damage on shafts and rotating components. With its coarse UNC thread pattern and temperature-resistant properties (-50° to 250°F), this set screw maintains clamping integrity in environments subject to thermal cycling and mechanical stress, making it ideal for permanent installations requiring consistent performance.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with Class 3A thread fit for superior dimensional accuracy. Features 5/16"-18 UNC coarse threads with right-hand direction and 5/32" hex drive. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Material certification includes 18-8 stainless steel with Rockwell B80 hardness for consistent mechanical properties.