Metallics JMHTB1216 Bolts M12 x 16 C8.8 Hx Tap Blt St-zn (Jar 50)

It's an M12 bolt with a 16mm length under the head and a 1.75mm thread pitch, which is the standard coarse pitch for M12. Threads run right hand, and they extend all the way up to the underside of the head, so there is no unthreaded shoulder to work around on a short grip.

Fully threaded to the head, so it works either way: thread it into a tapped hole in a motor foot or machine frame, or run it through a 12mm clearance hole with a nut on the back. At only 16mm of length, though, the usable grip is short, so it suits thin plate, flanges, and tapped bosses rather than stacked assemblies.

Class 8.8 is the medium carbon steel, heat treated grade, roughly the metric counterpart to SAE Grade 5. Hardness runs Rockwell C22-32, with a yield of 92,800 psi minimum. Metallics lists this bolt for mounting motors to machinery and for automotive and truck repair, so it is a structural-duty fastener rather than a general utility bolt.

No. The JMHTB1216 is not Buy American compliant and is not ARRA compliant, and country of origin is listed as multiple. If your job carries a domestic sourcing clause, this bolt will not satisfy it.

The JMHTB1216 is steel with a zinc plating. Zinc plate is a mild corrosion barrier meant for indoor and protected use, equipment rooms, mechanical rooms, motor mounts. For sustained wet exposure, washdown, or coastal air, step up to hot dip galvanized or stainless instead.

They ship as a jar of 50, and 50 each is the order minimum, so the jar is the smallest unit. Metallics notes other sizes and quantities are available by request if 50 of the M12 x 16 is not the count you need.

A tap bolt is threaded the full length, right up under the head, where a standard hex cap screw leaves an unthreaded body below the head. That matters when you are threading into a tapped hole and need engagement across the whole length, which is the case with a 16mm bolt where there is little length to spare. The JMHTB1216 has a hex head with a washer face beneath it, so it bears cleanly on a flat surface without a separate washer.

Metallics lists them for electrical, plumbing, heating, and air conditioning work, which covers strut and channel attachment, equipment feet, and panel and unit mounting across those trades. The description also calls out motor mounting and automotive or truck repair, so MRO and fleet shops stock the same bolt.

Order JMHTB1216. That falls in the Metallics MHTB and JMHTB tap bolt series, where the J prefix denotes the jar pack. The jar of 50 weighs 1,447 g.