S-91385A179 3/4"-10 x 3/4" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Permanent vibration resistance with nylon patch thread locker that maintains secure locking from -50°F to 250°F
• Superior corrosion protection through black-oxide coating on alloy steel for extended service life in harsh environments
• Maximum torque transmission via 3/8" hex drive design that prevents tool slippage during installation
• Precise thread engagement with Class 3A UNC coarse threads ensuring reliable fastening in high-vibration applications
• Enhanced material strength from Rockwell C45 hardness providing excellent resistance to wear and deformation
• Deep penetration capability through cup point design that creates positive seating in mating components
• Space-saving installation with headless construction ideal for confined spaces and flush mounting requirements

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers exceptional performance in demanding industrial environments where vibration resistance and permanent locking are critical. The nylon patch thread locker provides reliable fastening without requiring additional adhesives, maintaining integrity across extreme temperature ranges from -50°F to 250°F. Engineered with UNC Class 3A threads and cup point design, it ensures maximum holding power in machinery, automotive assemblies, and power transmission equipment. The hex drive configuration allows for high-torque installation while the headless construction enables flush mounting in pulleys, gears, and collars where protruding fasteners are impractical. This combination of features addresses common challenges of component slippage, vibration-induced loosening, and corrosion in heavy-duty applications.

Specification Summary & Compliance

This set screw features 3/4"-10 UNC Class 3A threads with coarse spacing and right-hand direction, manufactured to ASME B18.3 standards (ASTM F912). The component demonstrates Rockwell C45 hardness and meets comprehensive regulatory requirements including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) compliance regarding substance restrictions. The manufacturing process ensures precise dimensional accuracy with the specified thread fit class for reliable performance in industrial fastening applications.