S-91375A729 1/2"-20 x 3/8" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating protecting against rust and wear in harsh environments
• Exceptional holding power from Rockwell C45 hardness alloy steel maintaining clamp force under vibration
• Precision fine threading with Class 3A fit ensuring reliable, tight engagement in critical assemblies
• Secure installation through 1/4" hex drive providing positive torque control without cam-out
• Minimal surface damage from cup tip design distributing pressure evenly on contacted components
• Space-saving headless profile allowing flush mounting where clearance is limited
• Regulatory compliance meeting ASME B18.3, RoHS 3 and REACH standards for global industrial use

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers critical performance where vibration resistance and precise positioning are paramount. The 1/2"-20 UNF fine threads with Class 3A fit maintain dimensional stability in high-precision machinery, while the cup tip design prevents component marring in sensitive applications. The headless configuration and 1/4" hex drive enable secure fastening in confined spaces typical of motor collars, gear hubs, and precision fixtures. The Rockwell C45 hardness ensures the screw withstands repeated adjustments without thread deformation, making it ideal for permanent positioning applications across automotive, aerospace, and industrial equipment sectors.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with Class 3A thread fit for precision UNF fine threading. Features include: 1/2"-20 UNF right-hand threads, 0.5" thread diameter, 3/8" length, and cup tip configuration. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in regulated industries worldwide.