S-91375A596 5/16"-24 x 5/16" 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.
• High-strength durability from Alloy Steel and Rockwell C45 hardness, ensuring reliable performance under heavy loads.
• Precise thread engagement with UNF fine threads and Class 3A fit, minimizing backlash for secure assemblies.
• Easy installation and removal using the 5/32" hex drive, compatible with standard tools for efficient maintenance.
• Secure component locking thanks to the cup point design, which bites into surfaces to prevent loosening from vibrations.
• Space-saving headless construction ideal for confined spaces where protruding fasteners are not feasible.
• Compliance with major standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and regulatory adherence.

Professional Applications & Engineering Value

This Black-Oxide Alloy Steel set screw is engineered to address critical challenges in industrial applications where vibration resistance and precise alignment are paramount. The UNF fine thread and Class 3A thread fit provide exceptional clamping force and accuracy, reducing the risk of assembly failure in machinery, automotive, and aerospace components. The cup point tip digs into shafts or hubs, preventing rotational slip under dynamic loads, while the headless hex drive design allows flush mounting in tight spaces. Made from high-hardness Alloy Steel with a protective Black-Oxide finish, it combats corrosion and wear, ensuring long-term reliability in demanding environments. Ideal for securing gears, pulleys, and collars, this set screw delivers consistent performance where safety and precision cannot be compromised.

Specification Summary & Compliance

This set screw adheres to ASME B18.3 specifications, with precise Class 3A thread fit for tight tolerances and UNF fine thread (5/16"-24) ensuring optimal engagement. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, confirming it is free from hazardous substances and safe for industrial use. Dimensions include a thread diameter of 0.313" and length of 5/16", with a right-hand thread direction and 5/32" hex drive for standardized tool compatibility.