Hex Nuts - 5/16-24 (10)

ARP Hex Nuts 5/16-24 (10-pack) are precision-engineered fasteners designed for high-vibration and high-temperature applications where standard nuts fail. The 5/16-24 thread specification and 1/2-inch hex head deliver reliable clamping force in engine assembly, transmission work, and critical structural fastening where vibration loosening poses a safety or performance risk.

Each nut features a serrated flange base and steel construction with cadmium plating for corrosion resistance and extended service life. The serrated flange increases friction between the nut and mating surface, reducing the likelihood of vibration-induced loosening without requiring a separate locking washer. Cadmium plating provides superior corrosion protection in humid, salt-air, or chemically harsh environments while maintaining consistent friction characteristics across repeated assembly and disassembly cycles. The 10-count pack ensures you have backup fasteners for multi-unit projects or repairs.

These locking nuts are specified for motorsports engine builds, transmission rebuilds, suspension assembly, and any application where fastener reliability under vibration is non-negotiable. ARP's reputation in the high-performance and racing sector reflects decades of engineering fasteners that survive extreme thermal cycling and mechanical stress. Whether you're rebuilding a small-block V-8, assembling an off-road platform, or securing critical OEM-spec fastening points, this 5/16-24 hex nut set provides the thread diameter and locking mechanism your application demands.