S-91375A689 7/16"-20 x 1 3/4" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior holding power with a cup tip design that bites into surfaces for secure, permanent fastening in high-vibration environments.
• Exceptional thread precision with a Class 3A UNF fine thread fit, ensuring reliable engagement and reduced risk of cross-threading in precision assemblies.
• Enhanced durability and corrosion resistance from the Black-Oxide finish on Alloy Steel, extending service life in demanding industrial conditions.
• High-strength performance backed by a Rockwell C45 hardness, providing excellent resistance to wear and deformation under heavy loads.
• Optimized for confined spaces with a headless, hex drive design, allowing for installation in tight areas with a standard 7/32" hex key.
• Guaranteed reliability and interchangeability through compliance with ASME B18.3 specifications, ensuring consistent quality and fit.
• Safe for regulated industries with RoHS 3 and REACH compliance, meeting strict environmental and health standards for global use.

Professional Applications & Engineering Value

This 7/16"-20 UNF Class 3A Black-Oxide Alloy Steel set screw is engineered to address critical challenges in industrial assembly, such as component slippage and fastener failure. The fine thread spacing and Class 3A thread fit provide a tighter, more precise engagement than coarse threads, minimizing backlash in machinery and precision equipment. The headless hex drive and cup tip design allow for deep installation and superior grip on shafts, collars, and gears, making it ideal for permanent positioning in automotive, aerospace, and heavy machinery applications. Made from alloy steel with a Rockwell C45 hardness, it withstands high stress and repetitive motion, while the Black-Oxide surface treatment adds a layer of corrosion resistance, reducing maintenance needs in harsh environments.

Specification Summary & Compliance

This set screw adheres to ASME B18.3 specifications, ensuring dimensional accuracy and performance reliability. Key specifications include a 7/16"-20 UNF fine thread with a Class 3A thread fit for precise tolerances, a length of 1 3/4", and a 7/32" hex drive. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for use in environmentally conscious and regulated industrial markets.