Value Collection R50000019 Hex Lock Nut 5/8-18 Unf

Product Description

The VALUE COLLECTION R50000019 is a 5/8-18 UNF hex lock nut with a nylon insert locking mechanism, manufactured from Grade 2 steel with a zinc-plated finish. The nylon insert creates interference with the mating thread, resisting loosening caused by vibration and torque cycling without requiring thread-locking compound. At 49/64 inches in height with a 15/16-inch width across flats, this nut is sized for standard 5/8-inch fine-thread fastener assemblies. Plumbers, HVAC technicians, electricians, and mechanical contractors use nylon insert lock nuts wherever a secure, reusable fastener connection is required in moderate-duty applications.

This lock nut is suited for residential and light commercial mechanical assemblies where fine-thread engagement and vibration resistance are required. The right-hand thread direction is standard for the vast majority of fastener applications. The zinc-plated coating provides a base level of corrosion resistance suitable for interior and sheltered installations. The UNF thread standard ensures compatibility with inch-measurement fastener systems common across HVAC, plumbing, and electrical panel assemblies.

Key Features

• Nylon insert locking style resists loosening from vibration without adhesives or thread-locking compounds
• 5/8-18 UNF right-hand thread for standard inch-measurement fastener systems
• Grade 2 steel construction for moderate-duty mechanical applications
• Zinc-plated finish provides basic corrosion resistance for interior and sheltered installations
• 49/64 inches height and 15/16 inches width across flats for use with standard wrenching tools
• Reusable design allows disassembly and reassembly without replacing the locking element

Compatibility

Designed for use with 5/8-18 UNF inch-standard threaded fasteners in mechanical, HVAC, plumbing, and electrical assembly applications requiring a vibration-resistant hex lock nut.

Installation Notes

Install with a standard wrench sized to the 15/16-inch width across flats. Power down or de-energize any associated equipment before working on fastened assemblies in electrical or HVAC systems. The nylon insert is rated for a limited number of reuses — inspect the insert for deformation or wear before reusing in critical joints. Torque to the value specified by the equipment manufacturer or applicable mechanical code for the fastener size and grade.