Hillman Fasteners 180150 5/16-18 Nylon Insert Lock Nut 100 Pack

Product Description

The HILLMAN FASTENERS 180150 is a nylon insert lock nut designed to maintain a secure, vibration-resistant hold in threaded assemblies. The 5/16-18 coarse thread profile fits standard unified coarse (UNC) fastener systems. Each nut is zinc plated steel with a nylon insert collar that grips the mating bolt threads and resists loosening under dynamic loads. This fastener is used by HVAC technicians, plumbers, electricians, and general contractors for mechanical assemblies, equipment mounting, and structural connections where thread retention is required without a separate locking washer.

This lock nut is suited for both residential and light commercial applications. Common install scenarios include equipment panel mounting, pipe hanger assemblies, conduit supports, and general mechanical connections where standard hex nuts may back off under vibration or thermal cycling. The 5/16-18 coarse thread size is one of the most widely used thread profiles in trade work, making this pack a practical addition to a service truck or shop supply.

Key Features

• Nylon insert collar resists loosening from vibration and thermal movement without additional locking hardware
• 5/16-18 coarse thread (UNC) fits standard 5/16-inch bolts and threaded rod
• Zinc plated steel construction provides corrosion resistance for indoor and protected outdoor use
• 100-pack quantity reduces per-unit cost for high-volume or repeat fastener needs
• Standard hex body allows installation with common open-end, box, or socket wrenches

Compatibility

Designed for use with 5/16-18 UNC coarse thread bolts, screws, and threaded rod in standard steel fastener assemblies.

Installation Notes

Installation requires a standard 1/2-inch wrench or socket. Nylon insert lock nuts are single-use by design — once the nylon collar has been fully threaded and removed, the locking torque is reduced and the nut should not be reused in critical applications. Ensure mating bolt threads are clean and free of debris before installation. Follow applicable mechanical codes and equipment manufacturer specifications for final torque requirements.