S-91375A599 5/16"-24 x 1/2" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from the black-oxide finish, extending service life in demanding industrial environments.
• Exceptional thread engagement and vibration resistance due to the UNF fine thread with a precise Class 3A fit.
• High-strength and durability provided by alloy steel heat-treated to a Rockwell C45 hardness.
• Secure, flush mounting in tight spaces enabled by the headless design with a 5/32" hex drive.
• Reliable, non-slip fastening from the cup tip design, which bites into the contact surface.
• Guaranteed dimensional consistency and interchangeability through compliance with the ASME B18.3 specification.
• Safe for use in regulated industries as it is fully compliant with RoHS 3 and REACH environmental standards.

Professional Applications & Engineering Value

This black-oxide alloy steel set screw is engineered to solve critical challenges in precision assemblies. Its UNF fine thread and Class 3A fit ensure minimal backlash and superior resistance to loosening under vibration, making it ideal for machinery, automotive components, and permanent fixturing. The headless hex drive and cup tip allow for a flush installation and positive locking, preventing component shift in confined spaces. Manufactured from high-strength alloy steel with a Rockwell C45 hardness, it withstands high shear and tensile stresses, while the black-oxide surface treatment provides a durable layer of protection against corrosion, ensuring long-term reliability in harsh operating conditions.

Specification Summary & Compliance

This set screw adheres to a Class 3A thread fit for high precision in inch measurements. It conforms to the ASME B18.3 standard governing dimensional requirements. The product is manufactured to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring it meets strict environmental and safety regulations for hazardous substances.