Value Collection R52001618 Heavy Hex Lock Nut 5/16-18

Product Description

The VALUE COLLECTION R52001618 is a heavy hex lock nut with a nylon insert locking mechanism, designed for 5/16-18 UNC threaded fastener applications. Manufactured from Grade 2 steel with a zinc finish for corrosion resistance, this nut measures 7/16 inches in height and 9/16 inches across the flats. The nylon insert deforms around the mating thread to resist loosening caused by vibration or torque reversal without requiring a secondary locking device. It is installed by maintenance technicians, industrial mechanics, and trade professionals working with standard inch-series fastener assemblies.

This heavy hex lock nut is suited for general-purpose mechanical and structural fastening in residential, commercial, and light industrial applications. The right-hand thread direction conforms to standard UNC specifications, making it compatible with common 5/16-18 threaded bolts, studs, and threaded rod. It is widely used in HVAC equipment assembly, electrical enclosure mounting, plumbing support structures, and similar trade applications where vibration resistance is required.

Key Features

• Nylon insert locking style resists loosening under vibration without secondary hardware
• Grade 2 steel construction provides reliable strength for general-purpose fastening
• Zinc finish offers corrosion resistance for both indoor and protected outdoor environments
• Heavy hex profile provides additional wrench engagement surface compared to standard hex
• Right-hand UNC thread direction for compatibility with standard 5/16-18 fasteners
• Width across flats of 9/16 inches fits common wrench and socket sizes

Compatibility

Designed as a standard UNC replacement or stock nut for use with 5/16-18 threaded bolts, studs, and threaded rod in general-purpose mechanical and trade fastening applications.

Installation Notes

Installation requires a standard 9/16-inch wrench or socket. Nylon insert lock nuts are single-use by design and should not be reused after removal, as the insert loses locking effectiveness once deformed. Ensure mating threads are clean and free of damage before installation. This fastener does not meet military specifications and should not be substituted in applications requiring mil-spec hardware.