S-90673A112 5/16"-24 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through distorted thread top lock technology that maintains secure fastening in high-motion environments
• Enhanced durability and corrosion protection with black-oxide steel construction that withstands harsh industrial conditions
• Precision fine thread engagement with 5/16"-24 UNF Class 2B threads ensuring reliable, consistent performance
• High-strength performance meeting Grade 5 specifications for demanding industrial applications
• Easy installation and removal with standard external hex drive design compatible with common tools
• Environmental compliance assurance meeting both REACH and RoHS 3 standards for safe industrial use
• Optimized dimensional stability with 1/2" width and 19/64" height for consistent fit and function

Professional Applications & Engineering Value

This Grade 5 black-oxide steel locknut delivers exceptional engineering value through its distorted thread top lock mechanism that actively resists loosening under continuous vibration and dynamic loads. The UNF fine thread configuration (5/16"-24) provides superior thread engagement in precision assemblies, while the black-oxide surface treatment offers enhanced corrosion resistance in demanding environments. Ideal for industrial machinery, automotive systems, and heavy equipment applications, this external hex locknut solves critical fastening challenges where vibration-induced failure is a concern. The combination of Class 2B thread fit and top lock distorted thread design ensures reliable performance in critical assemblies requiring maintained clamp load and joint integrity.

Specification Summary & Compliance

This locknut features precision 5/16"-24 UNF fine threads with Class 2B thread fit for consistent engagement. Manufactured to Grade 5 strength specifications with standard external hex drive (1/2" width) and distorted thread top lock design. The product is fully compliant with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) environmental standards, ensuring safe use across industrial applications while meeting international fastener specifications for dimensional accuracy and performance reliability.