S-91375A567 1/4"-28 x 1 3/4" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating that protects against rust in demanding industrial environments
• Exceptional holding power achieved through Class 3A thread fit, ensuring maximum engagement and vibration resistance
• Enhanced durability from Rockwell C45 hardness alloy steel, maintaining performance under heavy loads
• Precise installation control with hex drive design and 1/8" drive size for secure tool engagement
• Optimal surface contact through cup tip design that creates positive seating on shafts and components
• Reliable fine threading with 1/4"-28 UNF specification for superior clamping force in precision applications
• Space-saving design as a headless set screw that fits flush in confined assembly spaces

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers critical performance in industrial applications where vibration resistance and precise component positioning are paramount. The Class 3A thread fit ensures tighter tolerances than standard fasteners, eliminating play in precision machinery, automotive assemblies, and manufacturing equipment. The cup tip design provides concentrated point contact that digs into shaft materials without causing excessive damage, making it ideal for permanent positioning of gears, pulleys, and collars. With Rockwell C45 hardness and fine UNF threading, this set screw maintains its clamping force under continuous stress cycles, solving common issues of component slippage in high-vibration environments. The headless configuration allows for flush mounting in space-constrained applications while the hex drive ensures sufficient torque application during installation.

Specification Summary & Compliance

This precision set screw features 1/4"-28 UNF fine threads with Class 3A fit for exceptional dimensional accuracy and thread engagement. Manufactured to ASME B18.3 specifications for consistent quality and performance. The product is fully RoHS 3 (2015/863/EU) compliant and meets REACH (EC 1907/2006) standards for environmental responsibility and workplace safety. The black-oxide surface treatment provides additional corrosion protection while maintaining the mechanical properties of the underlying alloy steel material.