S-91381A367 5/16"-24 x 3/4" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Precise, damage-free fastening with a brass soft tip that prevents marring on sensitive surfaces
• Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life in harsh environments
• Exceptional thread reliability with a Class 3A UNF fine thread fit for secure, vibration-resistant connections
• High-strength durability backed by Rockwell C28 hardness, ensuring long-term performance under load
• Easy installation and removal using the 5/32" hex drive, providing a secure grip for standard tools
• Space-saving headless design ideal for applications with limited clearance where a protruding head is not feasible
• Regulatory peace of mind with compliance to ASME B18.3, RoHS 3, and REACH standards

Professional Applications & Engineering Value

This 5/16"-24 UNF set screw is engineered for precision assemblies requiring reliable, high-strength fastening without surface damage. The brass soft tip is critical in applications involving delicate components—such as in precision machinery, automotive systems, and electronic enclosures—where it distributes pressure evenly to prevent indentation or stripping. Made from black-oxide alloy steel, it offers enhanced resistance to rust and wear, making it suitable for industrial environments exposed to moisture or chemicals. The Class 3A thread fit and fine thread spacing ensure tight, vibration-resistant connections, reducing the risk of loosening in dynamic loads. Its headless design with a hex drive allows for flush mounting in confined spaces, providing engineers with a versatile solution for secure shaft collars, gears, and pulleys.

Specification Summary & Compliance

This set screw adheres to ASME B18.3 specifications, with a Class 3A thread fit for precise dimensional accuracy in UNF fine threads. It is manufactured from alloy steel with a black-oxide surface treatment and features a 5/16"-24 thread size, 3/4" length, and 5/32" hex drive. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets environmental and safety standards for industrial use.