S-91381A196 8-32 x 5/8" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating that extends service life in demanding industrial environments
• Enhanced component protection through brass soft tip that prevents damage to mating surfaces during installation
• Precise thread engagement with Class 3A fit ensuring reliable, vibration-resistant fastening in critical applications
• High-strength performance from alloy steel construction with Rockwell C28 hardness for exceptional durability
• Space-saving design as a headless set screw ideal for compact assemblies and restricted clearance areas
• Industry-standard compatibility with UNC coarse threads meeting ASME B18.3 specifications for interchangeability
• Environmental compliance assurance with RoHS 3 and REACH regulations for global manufacturing applications

Professional Applications & Engineering Value

This 8-32 UNC set screw delivers exceptional engineering value in precision assembly applications where component protection and reliable positioning are critical. The black-oxide alloy steel construction provides superior corrosion resistance while maintaining the Rockwell C28 hardness required for high-strength fastening. The integrated brass soft tip eliminates marring and damage to shafts, gears, and collars during installation, making it ideal for precision machinery, automotive components, and industrial equipment. The Class 3A thread fit ensures tight tolerances for vibration resistance in dynamic applications, while the headless design with 5/64" hex drive accommodates space-constrained assemblies. These set screws solve common engineering challenges of component damage, loosening under vibration, and corrosion in harsh operating environments.

Specification Summary & Compliance

This precision fastener features 8-32 UNC coarse threads with Class 3A thread fit for exacting dimensional accuracy. Manufacturing complies with ASME B18.3 standards ensuring consistent quality and interchangeability. The product meets RoHS 3 (2015/863/EU) compliance for restricted substance control and REACH (EC 1907/2006) regulations for chemical safety. With a length of 5/8" and drive size of 5/64", these set screws deliver reliable performance in industrial fastening applications requiring precise thread engagement and environmental regulation adherence.