S-90291A856 1/4"-20 ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior vibration resistance with nylon 6/6 tip that prevents loosening under dynamic loads
• Exceptional corrosion resistance from 18-8 stainless steel construction for harsh environments
• Precise Class 3A thread fit ensures tight tolerances and reliable fastening performance
• Wide temperature tolerance (-50° to 250°F) maintains tip integrity across industrial applications
• High-strength Rockwell B80 hardness provides durable, long-lasting fastening solutions
• Easy installation and removal with 1/8" hex drive in compact headless design
• Industry-compliant performance meeting ASME B18.3 standards for quality assurance

Professional Applications & Engineering Value

This 18-8 stainless steel set screw with UNC coarse thread and nylon tip addresses critical engineering challenges in industrial assembly. The Class 3A thread fit provides superior engagement for permanent positioning applications while the green nylon 6/6 tip creates a vibration-resistant lock without damaging shaft surfaces. Ideal for precision machinery, automotive components, and electrical enclosures, this hex headless set screw delivers reliable clamping force in tight spaces where traditional fasteners fail. The right-hand thread direction and 1/8" hex drive enable quick installation in production environments while maintaining consistent performance across temperature variations from -50° to 250°F.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with Class 3A thread fit for precision UNC threading. Features 1/4"-20 thread size with coarse spacing and 0.25" thread diameter. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The 18-8 stainless steel construction maintains Rockwell B80 hardness standards for industrial durability and corrosion resistance.