S-90289A189 8-32 x 3/16" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with Black-Oxide finish, extending service life in demanding industrial environments
• Superior thread engagement with Class 3A fit and UNC coarse threads for reliable fastening in high-vibration applications
• Maximum torque transmission through 5/64" hex drive design, preventing tool slippage during installation
• Enhanced locking capability with serrations and cup tip design that bite into mating surfaces for secure positioning
• Optimized mechanical strength from Rockwell C45 hardened alloy steel, resisting deformation under heavy loads
• Space-saving headless design allowing flush mounting where clearance is limited
• Right-hand thread direction for standard installation procedures and operator familiarity

Professional Applications & Engineering Value

This 8-32 UNC Class 3A set screw delivers critical performance in precision assemblies where vibration resistance and positional security are paramount. The Black-Oxide Alloy Steel construction provides superior protection against environmental degradation while maintaining Rockwell C45 hardness for structural integrity. Engineered with coarse thread spacing and serrations locking mechanism, it effectively prevents loosening in rotating components, pulley systems, and shaft collars. The cup tip design concentrates contact pressure for maximum grip on mating surfaces, making it ideal for precision machinery, automotive components, and industrial equipment where reliable fastening cannot be compromised. The headless configuration and 5/64" hex drive enable installation in confined spaces while maintaining tool accessibility.

Specification Summary & Compliance

This precision fastener features 8-32 UNC Class 3A threads with coarse thread spacing, ensuring tight tolerances for critical applications. Manufactured to ASME B18.3 specifications for dimensional accuracy and performance reliability. The product is fully compliant with RoHS 3 (2015/863/EU) environmental directives and REACH (EC 1907/2006) regulations regarding substance restrictions, making it suitable for global industrial markets with strict environmental requirements.