Metallics JN163J Nuts 1/4-20 Hx Jam Nut St-zn (Jar 100)

Yes. The JN163J is a 1/4-20 hex jam nut, 20 threads per inch, so it runs onto any standard 1/4-20 UNC threaded rod, bolt, or stud. It is the thin pattern nut, so it is typically used as a locking or spacing nut against a full-height hex nut rather than as the primary load nut.

Use the full height hex nut to carry the load and the jam nut as the second nut tightened against it. The JN163J at 0.212 to 0.226 inch tall has less thread engagement than a standard nut, so it should not be the only nut taking the load on a rod hanger. Run the thick nut first, then jam this one against it to keep the assembly from backing off under vibration.

No. The JN163J is not Buy American compliant and is not ARRA compliant, with country of origin listed as multiple. For a federally funded job with domestic sourcing requirements, you will need a domestic-certified jam nut instead.

The JN163J is steel with a zinc finish. Zinc plating handles indoor, dry, and normally damp interior work fine, but it is not a stainless or hot dip galvanized part, so for sustained outdoor exposure, wet locations, or corrosive environments you want a stainless or galvanized jam nut instead.

They ship 100 to the jar, and the jar is the order minimum, so one jar is the smallest buy. The packed jar weighs 0.55 lbs. Metallics lists other sizes and quantities as available by request if you need a different thread or a bulk count.

They are rated for electrical, plumbing, heating and air conditioning work, with a hardness of Rockwell B95 to C32. That covers typical jobsite use: locking rod hangers, securing strut fittings, fixture studs, and conduit support assemblies.