S-91381A381 1/2"-20 x 1/2" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Enhanced corrosion resistance through black-oxide coating, extending service life in demanding industrial environments
• Superior thread engagement and vibration resistance with Class 3A UNF fine threads for maximum holding power
• Precise torque application enabled by 1/4" hex drive in headless design for flush mounting in confined spaces
• Mar-free fastening on delicate surfaces thanks to brass soft tip that prevents damage to components
• Exceptional mechanical strength from alloy steel construction with Rockwell C28 hardness for heavy-duty applications
• Reliable regulatory compliance meeting ASME B18.3 standards and environmental regulations including RoHS 3 and REACH
• Optimized for repeated adjustments with right-hand fine threading maintaining consistent clamping force

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers critical engineering solutions where precision fastening meets durability requirements. The Class 3A UNF fine threads provide exceptional resistance to loosening under vibration, making it ideal for machinery, automotive assemblies, and precision equipment. The brass soft tip protects expensive components from surface damage while maintaining secure positioning. Engineered with Rockwell C28 hardness, it withstands repeated adjustments without thread deformation. The headless hex drive design allows flush installation in space-constrained applications while the black-oxide finish resists corrosion in industrial environments. These features combine to create a reliable set screw that maintains clamping force in high-stress applications while meeting stringent industry standards.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with Class 3A thread fit ensuring precise dimensional accuracy and superior thread engagement. Features 1/2"-20 UNF fine threads with right-hand direction and 1/2" length. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming the absence of restricted substances. The alloy steel construction with black-oxide surface treatment provides consistent performance across industrial applications requiring reliable set screw solutions.