S-90669A535 1/4"-20 x 3/8" 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
• Precise thread engagement through Class 3A thread fit, ensuring reliable fastening with minimal backlash
• Enhanced component protection with soft brass tip that prevents damage to mating surfaces during installation
• High-torque installation capability via hex drive design, allowing secure tightening in confined spaces
• Optimized for high-vibration applications with coarse UNC threads that maintain grip under dynamic loads
• Consistent mechanical performance backed by Rockwell B80 hardness, providing reliable strength without brittleness
• Broad regulatory compliance meeting ASME B18.3 standards plus RoHS 3 and REACH environmental requirements

Professional Applications & Engineering Value

This 1/4"-20 UNC set screw delivers exceptional value in precision assembly applications where component positioning and rotational security are critical. The 18-8 stainless steel construction provides excellent corrosion resistance for demanding environments including marine, food processing, and outdoor equipment. The headless hex drive design allows installation in tight spaces while maintaining high torque transmission capability. The integrated soft brass tip protects expensive shafts and components from marring or deformation during clamping operations, making it ideal for precision machinery, gear assemblies, and adjustable mechanisms where surface preservation is essential. The Class 3A thread fit ensures consistent engagement in both through-holes and blind applications, reducing the risk of loosening in high-vibration industrial settings.

Specification Summary & Compliance

This set screw features precise 1/4"-20 UNC coarse threads with Class 3A thread fit for superior engagement tolerance. Manufacturing complies with ASME B18.3 specifications for dimensional accuracy and performance. The product meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) requirements for chemical safety. With a Rockwell B80 hardness rating and standardized dimensions including 3/8" length and 1/8" hex drive, this fastener delivers consistent performance across industrial applications.