Metallics JHHN78 Nuts 7/8-9 Hvy Hx Nut St-zn (Jar 30)

It is a 7/8-9 nut, so 7/8 inch diameter at 9 threads per inch, which is the standard UNC coarse pitch for that diameter. It will run onto any 7/8-9 UNC rod, anchor bolt, or all-thread. It will not fit 7/8-14 fine thread.

Heavy hex. Across the flats and in thickness a heavy pattern nut is larger than a finished hex nut of the same 7/8 thread size, which spreads bearing load over more surface and takes a bigger wrench. If your drawing calls out a heavy hex nut for structural or anchor bolt work, this is the pattern; if the detail calls for a finished hex, the heavy nut may foul adjacent steel or not fit the socket on hand.

The JHHN78 is steel with a zinc finish, which gives light corrosion protection suited to indoor, dry, and sheltered work. Zinc plating is not the same as hot dip galvanizing and is not intended for continuous outdoor exposure, coastal air, or chemical environments. For those, specify a hot dip galvanized or stainless nut.

They ship in a jar of 30. Order minimum is 25 count. The jar packaging keeps loose hardware contained on a service truck or a gang box rather than spilling in a bin.

The record flags the JHHN78 as ARRA compliant and Buy American compliant, with country of origin listed as China. On a federally funded project, verify which clause your contract invokes, since the compliance flag and the origin need to be reconciled against that specific requirement before submittal.

The JHHN series covers other sizes and pack quantities by request, so if you need a larger bulk count for a run of anchor bolts or a different diameter to match the rest of the assembly, ask rather than buying multiple jars.

A jar comes in at 6.81 lbs, with the container measuring 7.25 x 4.5 x 4.5 inches. Worth knowing if you are stocking several sizes on a service van shelf.