Value Collection B52001664 Heavy Hex Lock Nut 1-1/8-7 Unc

Product Description

The VALUE COLLECTION B52001664 is a 1-1/8-7 UNC Grade 2 heavy hex lock nut with a nylon insert, used to create a prevailing-torque connection that resists loosening from vibration and dynamic loads. The nut measures 1-53/64 inches across the flats and stands 1-7/16 inches high. It is manufactured from steel with a zinc-plated finish for basic corrosion resistance. The nylon insert deforms against the thread flanks during installation, providing mechanical resistance without requiring a secondary locking device. This fastener is installed by millwrights, ironworkers, pipefitters, and general mechanical contractors wherever heavy-pattern locking hardware is specified.

Heavy hex lock nuts with nylon inserts are commonly used in structural steel connections, industrial machinery, heavy equipment assemblies, and mechanical systems where standard hex nuts do not provide adequate vibration resistance. The heavy hex pattern provides a wider bearing surface and greater wrench engagement than a standard hex nut. This nut is suited for use in both indoor and outdoor mechanical applications where a Grade 2 steel fastener meets the load and torque requirements of the assembly.

Key Features

• 1-1/8-7 UNC thread form for use with matching UNC bolts and threaded rod
• Nylon insert provides prevailing-torque locking action without secondary hardware
• Heavy hex profile with 1-53/64 inch width across flats for increased bearing area
• Grade 2 steel construction with zinc-plated finish for general-purpose corrosion resistance
• 1-7/16 inch height accommodates the full nylon insert zone within thread engagement

Compatibility

Designed for use with 1-1/8-7 UNC threaded fasteners conforming to heavy hex nut dimensional standards. Verify thread class and grade requirements against the assembly specification before installation.

Installation Notes

Install using a wrench or impact tool sized for the 1-53/64 inch across-flats dimension. The nylon insert is a single-use locking element and should not be reused once fully seated and removed, as the insert loses clamping effectiveness after initial use. Follow applicable torque specifications from the project engineer or fastener standards reference for Grade 2 hardware. Ensure the mating bolt thread is free of damage, debris, and excess coating before driving the nut to final position.