S-91979A679 1/4"-20 x 1" Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction for long-lasting performance in harsh environments
• Maximum holding power achieved through Class 3A thread fit precision and coarse UNC thread spacing
• Secure installation and removal with hex drive design providing reliable torque transmission
• Enhanced component retention with cup point tip that digs into mating surfaces for vibration resistance
• Pressure equalization capability through 0.062" vent diameter preventing fluid or air lock during installation
• Space-saving design as a headless set screw ideal for applications with limited clearance
• Environmental compliance assurance meeting RoHS 3 and REACH standards for global industrial use

Professional Applications & Engineering Value

This 1/4"-20 UNC Class 3A stainless steel set screw delivers exceptional engineering value in demanding industrial applications where vibration resistance and corrosion protection are critical. The 18-8 stainless steel construction ensures durability in harsh environments, while the hex drive design allows for high-torque installation without stripping. The cup point tip creates permanent seating in shafts and collars, preventing rotational slippage in machinery, pulleys, and gear assemblies. The innovative vented design eliminates pressure buildup during installation, making it ideal for sealed systems and precision equipment. As a headless set screw, it provides flush mounting in space-constrained applications across automotive, aerospace, and manufacturing sectors.

Specification Summary & Compliance

This set screw features 1/4"-20 UNC coarse threads with Class 3A thread fit for precision engagement and superior holding strength. The right-hand thread direction and 1-inch length provide standardized installation across industrial applications. Manufactured to exacting standards, this fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in global markets. The combination of precise dimensional control and regulatory compliance makes this set screw suitable for quality-critical assemblies requiring reliable long-term performance.