S-91979A652 1/4"-20 x 1/4" Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction for long-lasting performance in harsh environments
• Exceptional thread engagement through Class 3A thread fit ensuring precise, secure fastening without stripping
• Maximum torque transmission via hex drive design providing reliable installation with standard tools
• Enhanced grip and anti-loosening from cup point tip that bites into mating surfaces for permanent positioning
• Pressure equalization capability through vented design preventing fluid or air buildup in assemblies
• Regulatory compliance assurance meeting RoHS 3 and REACH standards for global industrial applications
• Optimized for high-vibration environments with coarse UNC threads maintaining secure connections under stress

Professional Applications & Engineering Value

This 1/4-20 UNC set screw delivers critical engineering solutions for permanent fastening applications where reliability is paramount. The 18-8 stainless steel composition provides excellent corrosion resistance in manufacturing, marine, and chemical processing environments. The cup point design creates deep indentation in shafts and collars, preventing rotational slippage in high-torque applications. Combined with Class 3A thread fit precision, these set screws eliminate backlash in precision machinery, robotic assemblies, and power transmission systems. The vented feature addresses pressure differential issues in sealed components, while the hex drive configuration ensures consistent installation torque across production lines. These industrial set screws are engineered to maintain positional integrity in demanding applications where vibration and thermal cycling would compromise inferior fasteners.

Specification Summary & Compliance

This precision fastener maintains 1/4"-20 UNC coarse threads with Class 3A thread fit tolerances per ASME B18.3 standards, ensuring consistent engagement and reliable performance. The right-hand thread direction and 1/4" length provide standardized installation across industrial applications. Manufacturing compliance includes full adherence to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making these set screws suitable for global supply chains and regulated industries requiring documented material compliance.