S-90291A535 1/4"-20 ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior vibration resistance with green nylon 6/6 plastic tip that maintains grip under dynamic loads and temperature fluctuations from -50° to 250° F
• Exceptional corrosion resistance provided by 18-8 stainless steel construction, ensuring long-term reliability in harsh industrial environments
• Precise thread engagement with Class 3A thread fit for tighter tolerances and secure fastening in demanding applications
• Easy installation and removal through 1/8" hex drive design that accommodates standard tools while maintaining headless profile
• Reliable performance in assembly with UNC coarse thread pattern that resists loosening and provides quick installation
• Soft tip protection prevents damage to contact surfaces while maintaining secure positioning of components
• Industry compliance assurance meeting ASME B18.3 specifications for dimensional accuracy and performance standards

Professional Applications & Engineering Value

Engineered for precision positioning and secure component fastening, this 1/4-20 UNC set screw delivers exceptional value in industrial assemblies where vibration resistance and material compatibility are critical. The 18-8 stainless steel construction provides excellent corrosion resistance for harsh environments, while the green nylon 6/6 tip creates a vibration-dampening effect that prevents unintended loosening in machinery, automotive, and manufacturing equipment. The headless design with hex drive allows for flush mounting in confined spaces, and the Class 3A thread fit ensures precise engagement with mating components. This combination of features addresses common engineering challenges of component slippage, material degradation, and maintenance accessibility in permanent and semi-permanent fastening applications.

Specification Summary & Compliance

This set screw features 1/4"-20 UNC coarse threads with Class 3A thread fit for precision engagement, manufactured to ASME B18.3 dimensional standards. The component is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industries. The 18-8 stainless steel material provides Rockwell B80 hardness for durable performance, while the right-hand thread direction and standardized dimensions guarantee compatibility with existing industrial fastening systems.