S-91385A624 3/8"-16 x 1" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior vibration resistance with nylon patch thread locker that maintains integrity from -50°F to 250°F
• Exceptional holding power through Class 3A thread fit precision and Rockwell C45 hardness
• Corrosion-resistant black-oxide finish on alloy steel for extended service life in demanding environments
• Secure installation with hex drive design allowing high torque application without head interference
• Reliable positioning through cup tip design that creates consistent indentation for permanent fastening
• Industry-standard compatibility with UNC coarse threads meeting ASME B18.3 specifications
• Environmental compliance with RoHS 3 and REACH regulations for global industrial applications

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers critical vibration resistance in high-stress assemblies where loosening under dynamic loads poses significant failure risks. The nylon patch thread locker embedded in the UNC coarse threads creates permanent friction locking without requiring separate adhesives, while the cup tip design bites securely into shaft materials without causing excessive damage. Engineered to Rockwell C45 hardness, these headless set screws maintain dimensional stability under heavy clamping forces, making them ideal for precision machinery, power transmission components, and permanent positioning applications where Class 3A thread fit ensures consistent engagement in tapped holes.

Specification Summary & Compliance

Manufactured to ASME B18.3 and ASTM F912 specifications with Class 3A thread fit precision. Features 3/8"-16 UNC coarse threads with right-hand direction and 3/16" hex drive. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for industrial use.