Value Collection B52001621 Heavy Hex Lock Nut 5/8-11

Product Description

The VALUE COLLECTION B52001621 is a heavy hex lock nut with a nylon insert, designed to resist vibration-induced loosening in bolted assemblies. The nylon insert grips the thread and creates a prevailing torque that holds the nut in position even under dynamic loading. Built from Grade 2 steel with a zinc finish for basic corrosion resistance, this nut follows Unified National Coarse (UNC) thread standards at 5/8-11. It measures 55/64 inches in height and 1-1/16 inches across the flats, conforming to the wider bearing surface of the heavy hex series. Maintenance technicians, millwrights, and general tradespeople install these in structural and mechanical connections requiring a reliable, reusable locking fastener.

This heavy hex lock nut is suited for general industrial, construction, and mechanical maintenance applications where standard hex lock nuts are insufficient due to the wider flange requirement or increased bearing area of the heavy hex pattern. The 5/8-11 UNC thread size is common in structural steel connections, equipment mounting, and machinery fabrication. The right-hand thread direction is standard for most fastener applications. The zinc finish provides a baseline level of corrosion protection appropriate for indoor or sheltered environments.

Key Features

• Nylon insert locking style resists vibration loosening without damaging mating threads
• Heavy hex profile provides a larger bearing surface than standard hex nuts
• 5/8-11 UNC thread size with right-hand thread direction
• Grade 2 steel construction for general-purpose fastening applications
• Zinc finish offers basic corrosion resistance for sheltered environments
• Reusable nylon insert design allows removal and reinstallation

Compatibility

Designed as a standard UNC replacement or new-installation heavy hex lock nut for 5/8-11 threaded bolts and studs in general industrial and construction assemblies.

Installation Notes

Install using a wrench sized for 1-1/16 inches across the flats. Always ensure mating bolt threads are clean and free of damage before installation, as debris or deformed threads can compromise the nylon insert locking function. Torque to the value specified by the assembly drawing or applicable structural code for 5/8-11 Grade 2 hardware. Nylon insert lock nuts may be reused, but inspect the insert for wear or deformation before reinstalling in critical joints.