Value Collection MP39639 Hex Lock Nut 1/2-20 Grade 8

Product Description

The VALUE COLLECTION MP39639 is a 1/2-20 UNF hex lock nut with a nylon insert locking mechanism, manufactured from Grade 8 steel with a bright uncoated finish. The nylon insert creates interference with the mating thread, resisting loosening caused by vibration and torque cycling without the need for adhesives or secondary locking hardware. At 19/32 inches in height and 3/4 inches across the flats, this nut meets standard dimensions for 1/2-20 unified fine thread applications. It is suited for mechanical assemblies where a reliable, reusable locking fastener is required and where the operating environment stays within the thermal limits of nylon insert material.

This hex lock nut is used in general mechanical, industrial, and equipment assembly applications wherever 1/2-20 UNF fine thread fasteners are specified. Right-hand thread direction means standard installation with clockwise rotation. The bright uncoated finish is appropriate for dry or lightly protected indoor environments. Maintenance technicians, machine builders, and equipment assemblers commonly use this style of nut in structural joints, bracket assemblies, and shaft retention applications where vibration resistance is a priority.

Key Features

• Nylon insert locking style resists vibration-induced loosening without adhesive
• Grade 8 steel construction for high tensile and proof load capacity
• 1/2-20 UNF right-hand thread for standard fine-thread fastener systems
• 19/32 inch height and 3/4 inch width across flats — standard hex dimensions
• Bright uncoated finish suitable for dry indoor service environments
• Reusable locking action — nylon insert retains effectiveness through multiple installations

Compatibility

Designed for use with 1/2-20 UNF right-hand threaded bolts and studs in standard inch-measurement fastener assemblies.

Installation Notes

Installation is performed with a standard 3/4-inch wrench or socket. Ensure the mating bolt or stud is free of damage, burrs, or contamination before seating the nut. Do not use this nut in applications exceeding the temperature tolerance of nylon insert material, such as high-heat exhaust or engine-adjacent locations. Torque to the value specified by the equipment manufacturer or applicable fastener standard for Grade 8 hardware.