Hillman Fasteners 180165 5/8-11 Nylon Insert Lock Nut 25 Pack

Product Description

The HILLMAN FASTENERS 180165 is a 5/8-11 coarse thread nylon insert lock nut, zinc plated steel construction, sold in a 25-pack. The nylon insert creates friction against the mating bolt thread, resisting loosening from vibration and torque without damaging the fastener. Zinc plating provides corrosion resistance for general indoor and light outdoor use. These nuts are a standard item for mechanical assembly, HVAC equipment mounting, electrical enclosure work, and structural connections where a secure, reusable locking fastener is required.

Suited for use in residential and light commercial applications where 5/8-11 UNC fasteners are specified. Common install scenarios include equipment base mounting, strut and unistrut assemblies, conduit support hardware, ductwork hangers, and general mechanical connections. The 25-pack quantity fits service van stocking and single-job use alike. The coarse thread profile matches standard 5/8-11 bolts and threaded rod widely used across HVAC, electrical, and plumbing trades.

Key Features

• Nylon insert locks against bolt threads to resist vibration-induced loosening
• 5/8-11 coarse thread (UNC) fits standard bolts and threaded rod
• Zinc plated steel construction for corrosion resistance in general service environments
• Reusable locking mechanism does not damage mating bolt threads during removal
• 25-pack quantity supports single-job use or van stock replenishment

Compatibility

Designed for use with any standard 5/8-11 UNC threaded bolt or threaded rod in general mechanical, HVAC, electrical, or plumbing assembly applications.

Installation Notes

Nylon insert lock nuts are installed by hand-threading onto the mating fastener and torqued with a standard wrench or socket. Always verify the bolt thread specification matches 5/8-11 UNC before installation. Do not use an impact driver at high torque settings, as this can damage the nylon insert and compromise locking performance. Follow applicable mechanical codes and equipment manufacturer torque guidelines for the specific assembly.