Value Collection MP39625 Hex Lock Nut 1/2-13 Grade 8

Product Description

The VALUE COLLECTION MP39625 is a nylon insert hex lock nut designed to resist loosening under vibration and dynamic loading. Built to Grade 8 steel specifications, this 1/2-13 UNC threaded nut delivers high tensile strength suited for demanding mechanical and structural fastening applications. The embedded nylon insert creates interference with the mating bolt thread, providing a reliable prevailing-torque locking mechanism without additional hardware. At 19/32 inches in height and 3/4 inches across the flats, it fits standard 1/2-13 bolts and is compatible with common hex tooling. The uncoated finish is appropriate for use in controlled environments or where secondary coating will be applied by the installer.

This nut is commonly used in mechanical assemblies, structural connections, HVAC equipment mounting, pump and motor installations, and general trade fabrication work requiring a dependable locking fastener. Its Grade 8 rating makes it a suitable choice wherever high-clamp-load connections must resist loosening from vibration, thermal cycling, or repeated service access. Trade professionals in HVAC, plumbing, and mechanical contracting regularly use nylon insert lock nuts of this type in equipment mounting and support structure applications.

Key Features

• Nylon insert locking style provides prevailing-torque resistance without deforming the mating bolt
• Grade 8 steel construction for high tensile and proof-load strength
• 1/2-13 UNC thread size with right-hand thread direction
• 19/32 inch height and 3/4 inch width across flats for standard hex tooling
• Uncoated finish — compatible with field coating or use in dry environments
• Fastener standard: UNC (Unified National Coarse)

Compatibility

Designed as a standard replacement or new-installation hex lock nut for 1/2-13 UNC threaded bolts and studs in mechanical, structural, and trade equipment applications.

Installation Notes

Installation should be performed by a qualified mechanic or trade professional using an appropriate hex wrench or socket sized for a 3/4-inch across-flats nut. Nylon insert lock nuts are single-use by design — reuse after removal is not recommended, as the nylon insert loses clamping integrity once compressed. De-energize, depressurize, or otherwise make safe any equipment before performing fastener service. Refer to applicable codes and equipment manufacturer torque specifications when tightening into structural or pressure-rated assemblies.