S-91375A472 3/4"-16 x 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 minimizing loosening under vibration.
• High-strength durability from alloy steel and Rockwell C45 hardness, providing reliable performance under heavy loads.
• Secure, non-slip installation with the 3/8" hex drive, allowing for high torque application without tool slippage.
• Firm gripping action from the cup tip design, preventing component movement in assembled parts.
• Space-saving headless design, ideal for applications where protruding fastener heads are not feasible.
• Regulatory compliance assurance with RoHS 3 and REACH, meeting global environmental and safety standards.

Professional Applications & Engineering Value

This black-oxide alloy steel set screw is engineered to address critical industrial fastening challenges, such as vibration-induced loosening and corrosion in demanding environments. The Class 3A UNF fine thread provides a precise, tight fit that maintains clamping force in machinery, automotive, and heavy equipment assemblies. Its headless design with hex drive allows for flush mounting in confined spaces, while the cup tip ensures strong biting action on shafts and collars, preventing rotational slip. Made from high-strength alloy steel and treated to Rockwell C45 hardness, it offers reliable performance in high-stress applications, reducing maintenance needs and downtime.

Specification Summary & Compliance

This set screw features a 3/4"-16 UNF fine thread with Class 3A tolerance for high precision, right-hand thread direction, and a length of 4". It conforms to ASME B18.3 specifications and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and industry-standard reliability.