S-91375A583 5/16"-18 x 1" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior holding power with Class 3A thread fit for secure, vibration-resistant fastening in demanding applications
• Exceptional durability from Rockwell C45 hardness alloy steel, resisting wear and deformation under high stress
• Enhanced corrosion resistance with black-oxide coating, extending service life in industrial environments
• Reliable engagement with UNC coarse threads and cup tip design for deep, non-slip contact with shafts and components
• Space-saving headless design allowing flush mounting where protruding fasteners are not feasible
• Easy installation and removal using a standard 5/32" hex key, reducing assembly time and tooling complexity
• Full regulatory compliance with ASME B18.3, RoHS 3, and REACH, ensuring safety and environmental standards are met

Professional Applications & Engineering Value

This black-oxide alloy steel set screw is engineered to address critical challenges in industrial assemblies, such as shaft securing, pulley retention, and gear positioning. Its UNC coarse thread and Class 3A fit provide excellent resistance to loosening under vibration, while the cup tip ensures maximum contact pressure without damaging mating surfaces. The headless, hex socket design allows for compact installations in confined spaces, making it ideal for machinery, automotive, and heavy equipment applications where reliability and precision are paramount. Combined with Rockwell C45 hardness, it delivers long-term performance in high-stress environments, reducing maintenance needs and downtime.

Specification Summary & Compliance

This set screw adheres to ASME B18.3 specifications with UNC coarse threads and Class 3A thread fit for precise dimensional accuracy. It is manufactured from alloy steel with a black-oxide finish and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards, ensuring environmental safety and regulatory adherence.