Metallics JNC163 Nut 1/4-20 Hx Nut Cu (Jar 100)

The JNC163 is a 1/4-20 hex nut, so it threads onto any 1/4 inch bolt or stud with 20 threads per inch (standard UNC coarse thread). That is the common size for grounding lugs, ground bars, and bonding hardware on 1/4-20 studs.

Copper is the nut material, which is why it gets specified for grounding and bonding work: a copper nut on a copper or copper-alloy lug keeps the connection to a single metal and avoids the galvanic pairing you get when you put a plated steel nut on copper.

Yes, that is the usual application. The JNC163 is a 1/4-20 copper hex nut, which matches the 1/4 inch coarse studs on many ground bars, bonding jumpers, and lug assemblies, and keeps the whole termination copper-to-copper. Confirm your stud is 1/4-20 and not 1/4-28 fine thread before ordering.

One hundred nuts per jar, packed in a jar rather than a bag or box, so it stays on a shelf or in a van bin without the nuts spilling. That quantity suits an electrical contractor or MRO crib doing repeat grounding terminations rather than a one-off repair.

Copper is the reason this nut gets picked for wet locations, underground vaults, and exterior grounding electrode connections. It does not rust the way plain or plated steel does, and it will not set up a galvanic cell against copper conductors and lugs. For dry indoor framing work where corrosion is not a concern, a plated steel 1/4-20 nut does the same mechanical job.

It ships as a jar of 100 of the 1/4-20 copper hex nut. There is one model on the item, JNC163, so there are no size or finish choices to make at the order stage.