S-92311A309 1/4"-20 x 1 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
• Exceptional holding power provided by the cup point design that bites into surfaces for vibration-resistant fastening
• Precise Class 3A thread fit ensures tighter tolerances and reliable performance in critical applications
• Easy installation and removal with hex drive design requiring minimal clearance space
• Enhanced durability with Rockwell B80 hardness for long-term performance under heavy loads
• Industry-standard compliance meeting ASME B18.3 specifications for guaranteed quality and reliability
• Environmental responsibility with RoHS 3 and REACH compliance for safe use in regulated industries

Professional Applications & Engineering Value

This 1/4"-20 UNC Class 3A set screw delivers exceptional engineering value in applications where vibration resistance and reliable positioning are critical. The 18-8 stainless steel construction provides excellent corrosion resistance for machinery, automotive components, and industrial equipment exposed to moisture or chemicals. The hex headless cup point design offers superior gripping action that prevents component slippage in high-vibration environments, while the coarse UNC thread ensures quick installation and secure fastening. Engineered to ASME B18.3 standards, this set screw maintains precision in alignment-critical applications such as shaft collars, pulleys, and gear assemblies, providing lasting performance where ordinary fasteners might fail.

Specification Summary & Compliance

This precision fastener features 1/4"-20 UNC coarse threads with Class 3A thread fit for superior dimensional accuracy and tight tolerances. Manufactured in compliance with ASME B18.3 specifications, the screw meets rigorous industry standards for quality and performance. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring environmental responsibility and safety in industrial applications. With a Rockwell B80 hardness rating and 1 3/8" length, this set screw delivers consistent performance across demanding applications.