S-91375A659 3/8"-24 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 demanding industrial environments.
• Precise, secure fastening ensured by Class 3A thread fit, minimizing backlash and maintaining alignment in assemblies.
• High-strength performance from alloy steel with Rockwell C45 hardness, providing reliable holding power under heavy loads.
• Easy installation and removal with a 3/16" hex drive, allowing for efficient assembly using standard tools.
• Enhanced grip and minimal surface damage due to the cup tip design, ideal for repeated adjustments on shafts and collars.
• Consistent dimensional accuracy with UNF fine threads (3/8"-24), offering superior vibration resistance in precision applications.
• Broad regulatory compliance including 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 fastening, such as vibration-induced loosening and corrosion. The Class 3A thread fit and UNF fine threads deliver exceptional clamping force and stability, making it ideal for precision machinery, automotive components, and rotating assemblies like shafts and pulleys. The cup tip concentrates pressure to prevent slippage, while the headless design allows for flush mounting in confined spaces. Combined with Rockwell C45 hardness, it ensures long-term reliability in high-stress applications, reducing maintenance needs and downtime.

Specification Summary & Compliance

This set screw adheres to Class 3A thread tolerances for precise fit and is manufactured in accordance with ASME B18.3 specifications. It features a right-hand, fine UNF thread (3/8"-24) and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards, ensuring it is free from hazardous substances and suitable for global industrial use.