S-91385A358 1/4"-28 x 3/4" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior vibration resistance with nylon patch thread locker that maintains secure fastening from -50°F to 250°F
• Exceptional thread precision with Class 3A UNF fine threads ensuring tight, reliable connections in critical applications
• Enhanced durability through black-oxide alloy steel construction providing excellent corrosion resistance
• Optimized installation torque with 1/8" hex drive design allowing for precise tightening in confined spaces
• Maximum holding power achieved through Rockwell C45 hardness and cup point design for superior grip
• Space-saving headless configuration enabling flush mounting where clearance is limited
• Long-term reliability backed by compliance with ASME B18.3, ASTM F912, RoHS 3, and REACH standards

Professional Applications & Engineering Value

This black-oxide alloy steel set screw with nylon patch thread locker addresses critical vibration-induced loosening challenges in industrial machinery, automotive components, and precision equipment. The Class 3A UNF fine thread configuration ensures superior thread engagement and clamping force distribution, while the cup point design creates permanent seating in shafts and collars. Engineered for extreme temperature environments from -50°F to 250°F, this headless set screw provides reliable performance in applications where space constraints and vibration resistance are paramount. The combination of Rockwell C45 hardness and 1/8" hex drive delivers optimal installation control without compromising mechanical strength.

Specification Summary & Compliance

This set screw features precision 1/4"-28 UNF fine threads with Class 3A thread fit for superior dimensional accuracy. Manufactured to ASME B18.3 specifications and compliant with ASTM F912 standards. The product meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements, ensuring safe use across regulated industries.