S-91375A572 1/4"-28 x 3" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Exceptional holding power with Class 3A thread fit for precise, vibration-resistant fastening in demanding applications.
• Superior corrosion resistance from the black-oxide coating, extending service life in harsh industrial environments.
• High-strength durability provided by alloy steel and Rockwell C45 hardness, resisting wear and deformation under heavy loads.
• Secure, non-slip installation with the hex drive and 1/8" drive size, allowing for high torque application without tool slippage.
• Reliable component positioning due to the cup tip design, which bites into surfaces to prevent loosening.
• Fine thread spacing for improved adjustment accuracy and better load distribution compared to coarse threads.
• Space-saving headless design ideal for applications where a protruding head is not feasible.

Professional Applications & Engineering Value

This 1/4"-28 UNF Class 3A set screw is engineered to address critical challenges in machinery assembly, automotive systems, and precision equipment. The black-oxide alloy steel construction combats rust and wear, while the fine thread and cup tip ensure maximum grip and resistance to vibrational loosening. Its headless and hex drive design allows for flush mounting and easy access in confined spaces, providing reliable, long-term fastening solutions for industrial set screws applications where failure is not an option.

Specification Summary & Compliance

This set screw meets Class 3A thread tolerances for high precision, conforms to ASME B18.3 and ASTM F912 specifications, and is compliant with RoHS 3 and REACH environmental regulations, ensuring both performance reliability and global regulatory adherence.