S-91375A573 1/4"-20 x 3 1/2" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Exceptional holding power with Class 3A thread fit for tight, secure fastening in demanding applications
• Superior corrosion resistance from the black-oxide finish, extending service life in harsh industrial environments
• High-strength durability provided by alloy steel and Rockwell C45 hardness, resisting wear and deformation
• Secure, flush mounting with a headless design and cup tip, preventing component movement and surface damage
• Easy installation and removal using a standard 1/8" hex key, saving time on assembly lines
• Reliable performance in coarse UNC threads, ensuring quick engagement and reduced cross-threading risks
• Compliance with global standards including RoHS 3 and REACH, making it suitable for international supply chains

Professional Applications & Engineering Value

This Black-Oxide Alloy Steel set screw is engineered to address common industrial challenges like vibration-induced loosening and corrosion in machinery. Its headless design and cup tip provide a flush, secure fit that minimizes protrusion and distributes pressure evenly, ideal for securing collars, gears, and pulleys on shafts. The Class 3A UNC coarse threads offer quick assembly and high resistance to stripping, while the Rockwell C45 hardness ensures the screw maintains integrity under heavy loads. Commonly used in automotive, manufacturing, and aerospace applications, this screw delivers reliable performance where precision and durability are critical.

Specification Summary & Compliance

This set screw adheres to precise dimensional standards, including Class 3A thread fit for superior tolerance and UNC coarse threads (1/4"-20) with a right-hand direction. It meets ASME B18.3 specifications for consistency and safety in industrial use. Additionally, it is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and suitability for global markets.