Value Collection MP39637 Hex Lock Nut 3/8-24 Grade 8

Product Description

The VALUE COLLECTION MP39637 is a 3/8-24 UNF hex lock nut with a nylon insert locking mechanism, manufactured from Grade 8 steel in an uncoated finish. The nylon insert deforms around the mating thread as the nut is tightened, creating resistance to loosening from vibration, torque, and thermal cycling without requiring a secondary locking device. At 29/64 inches in height and 9/16 inches across the flats, this nut fits standard 3/8-24 fine-thread fastener applications. It is a standard inch-measurement fastener suitable for mechanical assemblies in HVAC equipment, plumbing supports, electrical enclosures, and general trade fabrication.

This lock nut is used in applications where fine-thread engagement and vibration resistance are required. The 3/8-24 UNF thread pitch provides tighter thread engagement compared to coarse-thread equivalents, making it a common choice for structural brackets, equipment mounting hardware, and precision assemblies in both residential and light commercial trade work. Grade 8 steel provides elevated proof load and tensile strength relative to Grade 5 or Grade 2 hardware, suitable for higher-stress fastening scenarios.

Key Features

• Nylon insert locking style resists loosening under vibration without additional hardware
• 3/8-24 UNF right-hand thread, inch measurement system
• Grade 8 steel construction for high proof load and tensile strength
• Uncoated finish suitable for dry or protected indoor installations
• 29/64 inches height, 9/16 inches width across flats for standard wrench fitment

Compatibility

Designed as an OEM-style replacement or standard fastener for any assembly using 3/8-24 UNF right-hand threaded bolts or studs requiring a prevailing-torque locking nut.

Installation Notes

Installation should be performed by a qualified mechanic or trade professional using a standard 9/16-inch wrench or socket. Nylon insert lock nuts are single-use fasteners and should not be reused once fully torqued, as the nylon locking element loses effectiveness after initial seating. Ensure mating bolt threads are clean and free of damage before installation. Power down or de-energize any associated equipment before accessing fastened assemblies in electrical or HVAC systems.