Value Collection 31-NU-50C Heavy Hex Lock Nut 1/2-13

Product Description

The VALUE COLLECTION 31-NU-50C is a heavy hex lock nut with a nylon insert, designed to provide secure, vibration-resistant fastening in threaded assemblies. Built from 18-8 stainless steel with a bright, uncoated finish, this nut resists corrosion in wet, chemical, or outdoor environments. The 1/2-13 UNC thread size and right-hand thread direction make it a standard fit across a wide range of mechanical and structural applications. At 45/64 inches high with a 7/8-inch width across flats, the heavy hex profile provides greater wrenching surface than a standard hex nut, supporting higher torque loads. Plumbers, HVAC technicians, electricians, and general mechanical contractors install this type of fastener routinely in both new construction and retrofit work.

This heavy hex nylon insert lock nut is suited for residential and commercial applications where vibration, thermal cycling, or repeated loading could cause a standard nut to loosen over time. The nylon insert grips the thread flank without damaging the bolt, allowing reuse in low-cycle applications. Typical install scenarios include pipe hangers, equipment mounting brackets, pump assemblies, conduit supports, and structural connections requiring stainless steel for corrosion resistance. It is sold individually and is compatible with 1/2-13 UNC threaded fasteners.

Key Features

• 18-8 stainless steel construction provides corrosion resistance in wet and chemical environments
• Nylon insert locking mechanism resists loosening from vibration and dynamic loads
• Heavy hex profile with 7/8-inch width across flats supports high-torque installation
• 1/2-13 UNC right-hand thread — standard coarse thread series
• Bright, uncoated finish — no plating to degrade or flake over time
• Width across points of 0.969 inches for positive socket engagement

Compatibility

Designed for use with 1/2-13 UNC right-hand threaded bolts, studs, and all-thread rod in standard inch-series fastener assemblies.

Installation Notes

Installation is performed with a standard 7/8-inch open-end, box, or socket wrench. Power down or de-energize any equipment before accessing fastener points on live assemblies. The nylon insert is a single-use locking element under high-cycle or high-torque conditions — inspect the insert for deformation before reuse. Follow applicable mechanical codes and equipment manufacturer torque guidelines when specifying final seating torque.