S-99291A230 5/16"-24 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through distorted top lock technology, preventing loosening in high-stress environments
• Enhanced corrosion protection with zinc yellow-chromate plating, extending service life in demanding industrial conditions
• Reliable fine thread engagement with UNF 5/16"-24 threading and Class 2B fit for precise, secure fastening
• Heavy-duty performance meeting ASTM Grade C standards, ensuring consistent strength in critical applications
• Easy installation and removal with standard external hex drive design compatible with common tools
• Optimized dimensions (1/2" width, 17/64" height) for space-constrained assemblies without compromising strength
• Right-hand thread direction for standard installation procedures and compatibility with existing components

Professional Applications & Engineering Value

This 5/16"-24 UNF locknut delivers exceptional engineering value through its distorted thread locking mechanism and zinc yellow-chromate-plated steel construction. The top lock distortion creates continuous friction against mating threads, effectively resisting vibration-induced loosening in machinery, automotive, and industrial equipment. The fine UNF thread profile ensures maximum thread engagement for superior load distribution, while the corrosion-resistant plating protects against environmental degradation. This combination addresses critical failure points in vibration-prone applications, providing maintenance-free performance and reducing downtime in assembly lines, power transmission systems, and heavy equipment where reliable fastening is non-negotiable.

Specification Summary & Compliance

Manufactured to precise Class 2B thread fit tolerances with UNF fine threading (5/16"-24) and standard external hex drive profile. Complies with ASTM Grade C mechanical properties and dimensional requirements. The zinc yellow-chromate plating provides RoHS and REACH compliant corrosion protection. Right-hand thread direction and standard hex nut profile ensure compatibility with existing UNF threaded components and tooling systems.