Value Collection 31-NTU-75C Heavy Hex Nylon Insert Lock Nut

Product Description

The VALUE COLLECTION 31-NTU-75C is a heavy hex lock nut with a nylon insert, threaded to the 3/4-10 UNC standard. It is manufactured from 18-8 stainless steel and left uncoated, providing corrosion resistance suited to both indoor and outdoor fastening applications. The nylon insert creates prevailing torque, resisting loosening caused by vibration or thermal cycling without the need for thread-locking compounds. At 1-1/4 inches across the flats and 45/64 inches in height, this heavy hex profile is designed for use with standard heavy hex tooling. Plumbers, pipefitters, electricians, HVAC technicians, and general maintenance trades install this type of fastener in mechanical assemblies, equipment mounting, and structural connections.

This nut is appropriate for general industrial and mechanical fastening applications where vibration resistance and stainless steel corrosion protection are required. The 3/4-10 UNC thread pitch is a common coarse-thread specification found in structural bolting, equipment frames, pipe supports, and mechanical equipment mounting throughout residential, commercial, and light industrial settings. The heavy hex body provides additional bearing surface compared to standard hex profiles, making it suitable for use in higher-load connections.

Key Features

• 3/4-10 UNC coarse thread — widely used in structural and mechanical fastening
• 18-8 stainless steel construction provides corrosion resistance without coating
• Nylon insert creates prevailing torque to resist loosening under vibration
• Heavy hex profile — 1-1/4 inches across flats — accepts standard heavy hex wrenches and sockets
• Uncoated finish — no plating to flake or degrade in wet or chemically active environments

Compatibility

Designed for use with 3/4-10 UNC threaded fasteners in heavy hex configurations. Suitable as an OEM-style or aftermarket replacement wherever a 3/4-10 UNC heavy hex nylon insert lock nut is specified.

Installation Notes

Installation is performed by hand-threading the nut onto a compatible 3/4-10 UNC bolt or stud, then advancing with a heavy hex wrench or socket until the nylon insert engages the threads and the specified clamp load is reached. Nylon insert lock nuts are generally rated for single use — inspect the nylon collar before reinstallation and replace if deformed or damaged. Follow applicable torque specifications from the equipment manufacturer or relevant fastening standards. No power tools or specialized trade license are required, though proper torque verification is recommended for safety-critical joints.