S-91385A344 10-32 x 5/8" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Permanent vibration resistance with integrated nylon patch locking that eliminates the need for separate thread-locking compounds
• Superior corrosion protection from the black-oxide finish, extending service life in demanding industrial environments
• High-strength, durable construction using alloy steel heat-treated to Rockwell C45 hardness for reliable load-bearing performance
• Precise, secure fastening ensured by the Class 3A UNF fine thread fit, minimizing the risk of loosening under dynamic loads
• Wide operational temperature range from -50°F to 250°F, maintaining locking integrity in both extreme cold and high-heat applications
• Streamlined installation and removal with the headless hex drive design, allowing flush mounting and access in confined spaces
• Enhanced grip and seating provided by the cup tip, which bites into surfaces for improved resistance to rotational forces

Professional Applications & Engineering Value

This 10-32 UNF Class 3A set screw is engineered to solve critical challenges in precision assemblies where vibration, thermal cycling, and space constraints are common. The nylon patch locking element creates a permanent, chemical-free bond that resists back-out, making it ideal for motors, machinery, and automotive components subjected to constant motion. Manufactured from black-oxide alloy steel, it offers excellent wear resistance and durability, while the fine thread spacing and cup tip design ensure maximum clamping force and minimal surface damage. Its ability to perform reliably across a broad temperature spectrum (-50°F to 250°F) makes it a versatile choice for HVAC systems, outdoor equipment, and industrial automation, where fastener failure is not an option.

Specification Summary & Compliance

This set screw adheres to ASME B18.3 specifications and features a Class 3A thread fit for high precision in UNF fine threads. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in global markets. The thread locker is integrated via a nylon patch, rated for continuous service from -50°F to 250°F.