S-91381A361 5/16"-24 x 1/2" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior anti-loosening performance with a brass soft tip that prevents damage to mating surfaces while maintaining secure positioning
• Exceptional corrosion resistance through black-oxide coating on alloy steel, extending service life in demanding industrial environments
• Precise thread engagement with Class 3A UNF fine threads ensuring reliable, vibration-resistant fastening in critical applications
• Optimized torque transmission via 5/32" hex drive design that prevents tool slippage and enables consistent installation force
• Enhanced durability with Rockwell C28 hardness providing excellent strength-to-weight ratio for long-term reliability
• Space-saving headless design allowing flush mounting in confined spaces where protruding fasteners aren't feasible
• Regulatory compliance assurance meeting ASME B18.3 specifications and environmental standards including RoHS 3 and REACH

Professional Applications & Engineering Value

This black-oxide alloy steel set screw with UNF fine thread configuration delivers exceptional engineering value in precision assembly applications. The Class 3A thread fit provides tighter tolerances than standard fasteners, eliminating play in high-vibration environments like machinery, automotive systems, and industrial equipment. The brass soft tip material prevents galling and surface damage when securing against shafts, collars, or other precision components, making it ideal for positioning applications where surface integrity is critical. The headless design with hex drive enables installation in confined spaces while maintaining positive drive engagement. This combination of precision threading, protective coating, and specialized tip solves common industrial challenges of component slippage, corrosion-induced failure, and installation damage in demanding set screw applications.

Specification Summary & Compliance

This set screw maintains Class 3A thread fit per UNF standards with precise 5/16"-24 fine thread configuration. Manufacturing complies with ASME B18.3 specifications for dimensional accuracy and performance requirements. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in regulated industries. The black-oxide surface treatment on alloy steel substrate provides consistent corrosion protection while the Rockwell C28 hardness guarantees mechanical integrity under load.