Value Collection 31-NTU-25C 1/4-20 Nylon Insert Hex Lock Nut

Product Description

The VALUE COLLECTION 31-NTU-25C is a 1/4-20 heavy hex lock nut with a nylon insert, manufactured from 18-8 stainless steel with a bright uncoated finish. The nylon insert creates interference with mating threads to resist loosening caused by vibration and torque fluctuation. At 9/32 inches high with a 1/2-inch width across flats, this fastener is sized for standard 1/4-20 UNC threaded applications in trade and industrial assemblies. Plumbers, HVAC technicians, electricians, and millwrights use nylon insert lock nuts where fastener retention under vibration is required and where corrosion resistance is a priority.

This nut is suited for residential and light commercial mechanical systems, equipment panels, pipe hangers, strut channel assemblies, and structural connections where stainless steel corrosion resistance is specified. The 18-8 stainless steel construction makes it appropriate for wet, humid, or corrosive environments including outdoor equipment mounting, pool mechanical rooms, and coastal installations. The right-hand thread direction matches standard UNC fastener systems throughout trade applications. This item is sold in a minimum order quantity of 25 pieces.

Key Features

• Nylon insert locking style resists vibration-induced loosening without adhesives or secondary locking hardware
• 18-8 stainless steel construction provides corrosion resistance in wet and humid service environments
• 1/4-20 UNC right-hand thread for compatibility with standard inch-series fastener systems
• Bright uncoated finish maintains dimensional accuracy and is suitable for food-adjacent or chemical-exposure applications where coatings may be undesirable
• Heavy hex profile offers more wrench engagement surface than standard hex for higher installation torque
• 9/32-inch height and 1/2-inch width across flats fit standard 1/2-inch wrenches and sockets

Compatibility

Designed for use with 1/4-20 UNC right-hand threaded fasteners and bolts in standard inch-series mechanical assemblies.

Installation Notes

Install using a standard 1/2-inch open-end, box, or socket wrench. Nylon insert lock nuts are typically single-use — the nylon element may lose clamping effectiveness if removed and reinstalled. De-energize or depressurize any system before accessing fastener locations on live mechanical or electrical equipment. Follow applicable code requirements for fastener material selection in corrosive or wet service locations.