Value Collection HFNI20310-100BX Serrated Flange Nut 5/16-18

Product Description

The VALUE COLLECTION HFNI20310-100BX is a serrated flange nut designed for secure fastening in mechanical, HVAC, plumbing, and general trade applications. The integrated serrated flange distributes clamping load across a wider bearing surface while the serrations bite into the mating material to resist vibration-induced loosening without a separate lock washer. Manufactured from Grade 2 steel with a zinc-plated finish for basic corrosion resistance, this nut carries a 5/16-18 UNC thread and a nominal flange diameter of 0.68 inches with a flange height of 0.283 inches.

This serrated flange nut is suited for residential and light commercial assembly work where a reliable, vibration-resistant connection is needed on 5/16-18 threaded fasteners. Typical applications include equipment mounting, ductwork and bracket assembly, electrical enclosure hardware, pump and motor mounting, and general sheet-metal or structural fastening tasks encountered in HVAC, plumbing, and electrical trades.

Key Features

• Serrated flange locks against loosening from vibration without a separate washer
• Grade 2 steel construction provides adequate strength for general trade fastening
• Zinc-plated finish offers basic corrosion protection in dry and mildly humid environments
• 5/16-18 UNC thread size fits a wide range of standard bolts and threaded rod
• Wide flange bearing surface reduces the risk of pull-through on thin or soft substrates
• Inch measurement system for compatibility with standard US trade tooling

Compatibility

Designed as a standard replacement or new-installation serrated flange nut for any 5/16-18 UNC threaded fastener application requiring an integrated locking flange.

Installation Notes

Installation is performed by hand-threading onto a 5/16-18 male fastener and torquing with a wrench sized to 0.489 to 0.500 inches across flats. De-energize or shut down equipment before accessing fastener locations on live mechanical or electrical assemblies. Do not reuse serrated flange nuts that show deformed serrations, as the locking action may be compromised. Follow applicable codes such as NEC or IFGC for hardware used in electrical or gas-related assemblies.