S-90291A534 1/4"-20 ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking with durable green nylon 6/6 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 and minimal backlash
• Easy installation in confined spaces using hex drive design with headless configuration
• Wide temperature compatibility with nylon tip performing from -50° to 250°F (-45° to 121°C)
• Standardized dimensions per ASME B18.3 for seamless replacement and interchangeability
• Environmental compliance meeting RoHS 3 and REACH regulations for global manufacturing

Professional Applications & Engineering Value

This 1/4"-20 UNC hex headless set screw delivers exceptional vibration resistance in demanding industrial applications where secure positioning is critical. The 18-8 stainless steel body provides excellent corrosion resistance for machinery exposed to moisture, chemicals, or outdoor elements, while the green nylon 6/6 tip creates a non-marring, self-locking action that maintains clamping force without damaging shaft surfaces. Engineered with Class 3A thread fit and coarse thread spacing, this right-hand thread set screw offers superior holding power in pulleys, gears, and collars, making it ideal for power transmission systems, automotive assemblies, and precision manufacturing equipment where reliability cannot be compromised.

Specification Summary & Compliance

This set screw features 1/4"-20 UNC threads with Class 3A precision tolerance and coarse thread spacing for optimal engagement. Manufactured to ASME B18.3 specifications with Rockwell B80 hardness for consistent performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring safe use in regulated industries worldwide.