S-91375A520 1"-14 x 2 1/2" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Exceptional holding power with Class 3A thread fit and fine thread spacing for maximum resistance to vibration and loosening in demanding applications.
• Superior durability and wear resistance provided by the alloy steel material and Rockwell C45 hardness, ensuring a long service life under high stress.
• Corrosion-resistant black-oxide finish enhances protection against rust and oxidation, extending the screw's lifespan in various industrial environments.
• Secure and reliable installation is achieved with the 9/16" hex drive and headless design, allowing for high torque application and a flush, unobtrusive fit.
• Precision-engineered cup tip concentrates force for a strong bite into the mating surface, preventing slippage and ensuring a firm grip.
• Compliance with major industry standards including ASME B18.3 and ASTM F912, guaranteeing consistent quality, dimensional accuracy, and performance reliability.
• Environmentally responsible manufacturing as it is RoHS 3 and REACH compliant, meeting strict international regulations for hazardous substances.

Professional Applications & Engineering Value

This black-oxide alloy steel set screw is engineered to address critical fastening challenges in industrial settings where vibration, high loads, and precision alignment are concerns. The headless design and hex socket drive allow for seamless integration in confined spaces, providing a clean profile while enabling high torque application without protrusion. The fine thread spacing and Class 3A thread fit ensure minimal backlash and superior clamping force, making it ideal for securing collars, gears, and pulleys on shafts in machinery, automotive, and aerospace applications. The cup tip design offers concentrated contact pressure, reducing the risk of component slippage under dynamic loads. Combined with its Rockwell C45 hardness and corrosion-resistant finish, this screw delivers reliable performance in harsh environments, reducing maintenance frequency and downtime.

Specification Summary & Compliance

This set screw features a 1"-14 UNS fine thread with a Class 3A fit for high precision and tight tolerances. It meets dimensional and mechanical specifications per ASME B18.3 and ASTM F912. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from restricted hazardous substances and safe for use in regulated markets.