Value Collection 52591385-100 Hex Lock Nut 5/8-11 Grade 5

Product Description

The VALUE COLLECTION 52591385-100 is a 5/8-11 UNC hex lock nut with a nylon insert locking mechanism, manufactured from Grade 5 steel with a zinc finish. The nylon insert collar deforms around the mating thread under torque, creating friction-based resistance to loosening from vibration or dynamic loads. At 3/4 inches in height and 15/16 inches across the flats, this nut meets standard dimensional requirements for 5/8-11 UNC fastener applications. It is installed by maintenance technicians, millwrights, and general contractors wherever a reliable prevailing-torque locking nut is specified.

This hex lock nut is suited for mechanical assemblies, structural connections, and equipment mounting where thread loosening under vibration or cyclic loading is a concern. The right-hand thread direction is standard for the vast majority of bolted connections in industrial, commercial, and light structural applications. The zinc finish provides a base level of corrosion resistance appropriate for indoor and sheltered environments.

Key Features

• Nylon insert locking style provides prevailing-torque resistance without secondary fasteners or thread-locking compounds
• 5/8-11 UNC right-hand thread for compatibility with standard inch-series bolts and threaded rod
• Grade 5 steel construction for reliable tensile and proof-load performance in general-duty applications
• Zinc finish for basic corrosion protection in dry or sheltered installations
• Standard hex profile fits 15/16-inch wrenches and sockets for straightforward installation and removal

Compatibility

Designed as a standard prevailing-torque replacement or new-installation hex lock nut for 5/8-11 UNC inch-series threaded fastener applications.

Installation Notes

Installation is performed by hand-threading the nut onto the mating bolt or threaded rod until the nylon insert engages, then torquing with a standard 15/16-inch open-end, box, or socket wrench. Nylon insert lock nuts are generally single-use — once the insert has been fully engaged and removed, the locking effectiveness is reduced and replacement is recommended. Avoid installation in applications where sustained temperatures will exceed the thermal rating of nylon, as elevated heat degrades insert performance.