Metallics JN165J Nuts 3/8-16 Hx Jam Nut St-zn (Jar 100)

The JN165J is a 3/8-16 hex jam nut, so 16 threads per inch on a 3/8 inch diameter. That is the standard UNC coarse thread used on 3/8 inch threaded rod and hanger rod, so it runs onto common 3/8 inch all-thread without an adapter.

They ship as a jar of 100, and 100 in the jar is the order minimum, so the jar is the unit you buy rather than a loose count. Metallics notes other sizes and quantities are available by request.

No. Metallics lists the JN165J as not Buy American compliant and not ARRA compliant, with country of origin given as multiple. For federally funded work carrying domestic sourcing requirements you will need a domestically produced 3/8-16 jam nut instead.

A jam nut is a thinner hex nut. It gets run down against a standard nut, a fitting, or a bracket to lock the first nut in place and keep it from backing off under vibration, and its reduced height is useful where a full nut will not clear. The JN165J is a hexagonal jam nut in 3/8-16, so it pairs with a standard 3/8-16 hex nut on the same rod.

The JN165J is steel with a zinc finish. Zinc plating handles normal indoor and sheltered conditions well, including damp interior mechanical rooms, but it is a sacrificial coating rather than stainless, so for sustained wet exposure, coastal air, or chemical environments a stainless nut is the better call.

Hardness is Rockwell B95 to C32, which puts it in the range of a medium carbon steel nut rather than a soft commercial nut, so the threads hold up to repeated run-down on threaded rod. As with any jam nut, the limiting factor is its reduced height, not the material, so it should be used as a locking or clearance nut rather than carrying the full load alone.

Metallics lists the packaged weight at 1.06 lbs, with the jar measuring 3 in. by 3 in. by 2.15 in. tall. Light enough to carry several jars per van stock bin.