S-91375A640 3/8"-24 x 1/4" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance from the black-oxide finish, extending service life in demanding industrial environments.
• Superior holding power and vibration resistance due to the high-strength alloy steel and Rockwell C45 hardness.
• Precise and secure fastening enabled by the Class 3A thread fit, ensuring tight tolerances and reliability.
• Easy installation and removal in confined spaces with the headless design and 3/16" hex drive.
• Enhanced grip on shafts and components provided by the cup tip, preventing slippage and movement.
• Guaranteed compatibility and interchangeability by conforming to the 3/8"-24 UNF fine thread standard.
• Safe for use in regulated industries with compliance to RoHS 3 and REACH environmental standards.

Professional Applications & Engineering Value

This black-oxide alloy steel set screw is engineered to solve critical challenges in industrial assembly, such as component slippage and loosening under vibration. The headless design and hex drive allow for installation in tight spaces where traditional fasteners cannot fit, making it ideal for securing collars, gears, and pulleys on shafts. The Class 3A thread fit and UNF fine threads provide a precise, secure connection that maintains clamping force in high-stress applications. Manufactured from high-strength alloy steel with a Rockwell C45 hardness, it offers excellent durability and resistance to wear, ensuring long-term performance in machinery, automotive, and aerospace systems. The cup tip digs into surfaces for a firm, non-slip hold, preventing rotational movement and enhancing the reliability of your assemblies.

Specification Summary & Compliance

This set screw adheres to precise dimensional standards, including a Class 3A thread fit for superior accuracy and a 3/8"-24 UNF fine thread specification. It is manufactured in compliance with ASME B18.3 and ASTM F912 specifications, ensuring consistent quality and performance. The product is also RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting stringent environmental and safety regulations for industrial use.