Value Collection MP34287 Hex Lock Nut 5/8-18 Grade 2

Product Description

The VALUE COLLECTION MP34287 is a 5/8-18 UNF hex lock nut with a nylon insert locking mechanism, manufactured from Grade 2 steel with a zinc finish for corrosion resistance. The nylon collar compresses against mating threads when the nut is fully seated, creating prevailing torque that resists loosening from vibration and thermal cycling. At 49/64 inches in height with a 15/16-inch width across flats, this nut suits standard hex tooling. It is a right-hand thread fastener sized to UNF specifications and is well suited for mechanical assemblies in HVAC equipment, plumbing, electrical enclosures, and general trade fabrication work.

This hex lock nut is used wherever a standard threaded fastener joint requires vibration resistance without thread-locking compounds. Common applications include equipment mounting brackets, panel assemblies, and structural connections on residential and light commercial systems. The 5/8-18 UNF thread size is a fine-pitch designation, typical in applications where precise clamping load and joint security are required. The zinc coating provides baseline corrosion protection for indoor and sheltered outdoor installations. Trade professionals including HVAC technicians, plumbers, and electricians use this type of fastener during equipment installation and field fabrication.

Key Features

• Nylon insert locking style resists loosening under vibration without thread-locking compounds
• 5/8-18 UNF right-hand thread for compatibility with standard fine-pitch inch fastener systems
• Grade 2 steel construction provides adequate tensile strength for general mechanical assemblies
• Zinc finish offers corrosion resistance for indoor and sheltered applications
• 49/64 inch height and 15/16 inch width across flats fit standard hex wrenches and sockets

Compatibility

Designed as a standard UNF hex lock nut for use with 5/8-18 right-hand threaded fastener applications in mechanical, HVAC, plumbing, and electrical trade assemblies.

Installation Notes

Installation requires a standard hex wrench or socket sized to 15/16 inch across flats. De-energize and isolate any equipment before working on fastened assemblies. The nylon insert is single-use by design — once the nut has been fully run down and removed, the locking effectiveness of the insert is reduced and the nut should be replaced. Do not exceed the rated torque range for Grade 2 fasteners as published in applicable mechanical codes and fastener standards.