S-90291A578 5/16"-18 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
• Exceptional vibration resistance provided by the green nylon 6/6 plastic tip, preventing loosening under dynamic loads
• Precise thread engagement with Class 3A thread fit ensuring reliable fastening in demanding applications
• Wide temperature tolerance from -50° to 250°F, maintaining performance across extreme operating conditions
• Optimized drive efficiency with 5/32" hex drive design for secure tool engagement and torque transmission
• Enhanced durability with Rockwell B80 hardness, providing excellent wear resistance and long service life
• Reliable coarse thread design with UNC specification for quick assembly and disassembly in various materials

Professional Applications & Engineering Value

This hex headless set screw delivers exceptional engineering value in precision assembly applications where space constraints and vibration resistance are critical. The 18-8 stainless steel construction provides excellent corrosion resistance for machinery, automotive components, and outdoor equipment, while the Class 3A thread fit ensures precise engagement in tapped holes. The nylon 6/6 plastic tip protects shaft surfaces from damage while effectively resisting loosening caused by vibration in motors, gears, and rotating assemblies. The coarse UNC thread facilitates quick installation in various materials, making it ideal for production environments requiring efficient assembly processes and reliable long-term performance.

Specification Summary & Compliance

This set screw features 5/16"-18 UNC coarse threads with Class 3A thread fit for precision tolerance, manufactured to ASME B18.3 specifications. The product maintains compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in industrial applications worldwide. The right-hand thread direction and headless design provide streamlined installation in confined spaces while maintaining the mechanical integrity required for demanding fastening applications.