Metallics JHHN12 Nuts 1/2-13 Hvy Hx Nut St-zn (Jar 100)

The JHHN12 is a 1/2-13 nut, so 1/2 inch diameter at 13 threads per inch, which is standard UNC coarse thread. It will run onto any 1/2-13 coarse-thread rod, bolt, or anchor stud. It will not fit 1/2-20 fine thread.

Across the flats the nut measures 0.850 to 0.875 inch, so a 7/8 inch wrench or socket is the fit. That is wider than a standard 1/2-13 hex nut, which is why heavy hex nuts need their own socket size and more clearance around the joint.

Grade 2 zinc-plated steel is the normal pairing for Grade 2 / low carbon 1/2-13 all-thread used on trapeze hangers, conduit supports, and unistrut work. Hardness is Rockwell B68 to C32. If your drawing calls out a Grade 5 or Grade 8 bolt or a high-strength structural connection, match the nut to that bolt grade instead of using a Grade 2.

No. The JHHN12 heavy hex nut is not Buy American compliant and is not ARRA compliant, with country of origin listed as multiple. On a federally funded project with domestic sourcing requirements you will need a domestically produced heavy hex nut instead.

Nut height runs 0.464 to 0.504 inch, roughly 31/64 inch. Budget about a half inch of thread engagement plus that height when you cut all-thread rod to length. Corner-to-corner the nut measures 0.969 to 1.010 inch, so it needs about an inch of clearance in any pocket or channel slot you drop it into.

Zinc-plated steel handles indoor and sheltered damp locations fine, and it is what most interior electrical and mechanical hanging work uses. For direct weather exposure, wash-down areas, pools, or coastal sites, step up to a stainless or hot-dip galvanized heavy hex nut instead; plated zinc on steel will eventually bleed rust in those conditions.

They ship as a jar of 100 pieces, and the jar is the minimum order quantity. The packed jar weighs 6.07 lbs. Other sizes and quantities are available by request.

A heavy hex nut has a larger hex and a thicker body than a standard finished hex nut of the same thread, so it spreads load over more bearing area and gives a bigger wrenching surface. On the JHHN12 that means 0.850 to 0.875 inch across the flats and 0.464 to 0.504 inch tall. Use the heavy pattern where a spec calls it out or where you want more bearing on soft material or an oversized hole; a standard hex nut is the one to use when clearance is tight or the spec says standard.

It is sold into the electrical, plumbing, heating, and air conditioning trades, which is where 1/2-13 all-thread rod shows up most: conduit and cable tray supports, pipe hangers, trapeze assemblies, and equipment mounting. For a maintenance crib it is a sensible standardize-on item since 1/2-13 is the most common rod size on those systems.