S-91375A297 12-28 x 1/4" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating, extending service life in harsh industrial environments.
• Exceptional thread precision with Class 3A fit, ensuring tight, reliable fastening and vibration resistance.
• High-strength durability from alloy steel and Rockwell C45 hardness, supporting heavy-duty applications.
• Secure, flush mounting with headless design and cup tip, preventing loosening and component damage.
• Easy installation and removal using a standard 3/32" hex key, reducing assembly time and tool wear.
• Fine UNF thread spacing for enhanced grip and load distribution in precision assemblies.
• Compliance with industry standards including ASME B18.3, ensuring consistent quality and safety.

Professional Applications & Engineering Value

This 12-28 UNF set screw is engineered to address critical challenges in industrial fastening, such as vibration-induced loosening and corrosion in demanding environments. Made from black-oxide alloy steel, it combines high tensile strength with a protective coating that resists rust and wear, ideal for machinery, automotive, and aerospace components. The headless design with a cup tip provides a flush finish, minimizing protrusion and securely locking shafts or collars without marring surfaces. With Class 3A thread fit and fine UNF threads, it delivers precise alignment and reliable torque retention, reducing maintenance needs and enhancing operational safety in heavy-duty fasteners applications.

Specification Summary & Compliance

This set screw features a 12-28 UNF thread size with Class 3A thread fit for high precision and tight tolerances, adhering to ASME B18.3 manufacturing standards. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity. The right-hand thread direction and fine thread spacing support consistent performance in industrial assemblies.