S-91375A533 1/4"-20 x 1/4" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior holding power with Class 3A thread fit for tight, reliable fastening in demanding applications
• Enhanced corrosion resistance from the black-oxide finish, extending service life in industrial environments
• High-strength durability with Rockwell C45 hardness alloy steel, resisting deformation under heavy loads
• Secure, non-slip installation using the 1/8" hex drive, allowing precise torque application without head interference
• Effective grip and minimal surface damage from the cup tip design, ideal for repeated adjustments
• Broad compatibility with UNC coarse threads, ensuring easy assembly and interchangeability
• Confident compliance meeting ASME B18.3, RoHS 3, and REACH standards for safe, regulated use

Professional Applications & Engineering Value

This black-oxide alloy steel set screw is engineered to address common industrial challenges like vibration loosening and corrosion in machinery components. The headless design with hex drive allows flush mounting in confined spaces, while the UNC Class 3A coarse threads provide rapid installation and high resistance to shock loads. The cup tip concentrates pressure for a firm grip on shafts or collars without significant marring, making it ideal for precision equipment, automotive assemblies, and heavy-duty manufacturing setups. Its Rockwell C45 hardness ensures it maintains integrity in high-stress applications, reducing maintenance frequency and downtime.

Specification Summary & Compliance

This set screw features a 1/4"-20 UNC coarse thread with Class 3A fit for precise dimensional accuracy, manufactured in accordance with ASME B18.3 specifications. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions adherence for global industrial use.