Value Collection MP39662 Hex Lock Nut 5/16-24 Grade 8

Product Description

The VALUE COLLECTION MP39662 is a 5/16-24 UNF hex lock nut with a nylon insert locking style, manufactured from Grade 8 steel with a yellow zinc dichromate finish. The nylon insert creates friction against the mating thread, resisting loosening caused by vibration and torque cycling. At 23/64 inches high with a 1/2-inch width across flats, this is a compact, high-strength fastener suited for assemblies where joint integrity under load is critical. The yellow zinc dichromate coating provides a baseline level of corrosion resistance. This nut is installed by mechanics, millwrights, HVAC technicians, and general trade professionals wherever a prevailing-torque locking fastener is specified.

This hex lock nut is used in mechanical, HVAC, electrical, and general industrial assembly applications that call for a fine-thread, inch-series locking nut. The 5/16-24 UNF thread designation makes it appropriate for applications requiring finer thread engagement and greater tension control than a coarse-thread equivalent. It is a right-hand thread fastener, tightened clockwise. Typical use cases include equipment panels, brackets, motor mounts, and structural assemblies where vibration resistance is required.

Key Features

• Nylon insert locking style resists loosening under vibration without damaging mating threads
• Grade 8 steel construction for high tensile and proof-load strength
• 5/16-24 UNF right-hand thread for fine-pitch inch-series applications
• Yellow zinc dichromate finish for corrosion resistance
• 1/2-inch width across flats fits standard hex tooling
• 23/64-inch height suits space-constrained fastening locations

Compatibility

Designed for use with 5/16-24 UNF inch-series threaded fasteners and bolts in general mechanical and trade assembly applications.

Installation Notes

Install using a standard 1/2-inch hex wrench or socket. Ensure the mating bolt thread is clean and free of debris before running the nut down. Power off or de-energize any equipment before performing fastener service on live assemblies. Do not reuse nylon insert lock nuts in safety-critical applications, as the nylon locking element loses effectiveness after the initial installation cycle.