Metallics JMHTB1245 Bolts M12 x 45 C8.8 Hx Tap Blt St-zn (Jar 50)

Yes, it's a tap bolt, so the thread runs the full 45mm shank right up to beneath the hex head. That means you can use the full depth of a tapped hole or a thick stack of material without worrying about an unthreaded grip length landing in the threads. The head also has a washer face underneath it to bear evenly on the surface.

The thread is M12 with a 1.75mm pitch, which is standard metric coarse, and it is right hand. Any M12 x 1.75 tapped hole or nut will take it. If your equipment is tapped M12 x 1.25 or 1.5 (fine pitch, common on some automotive components), this bolt will not thread in.

Grade 8.8 is medium carbon steel, heat treated, with a minimum tensile strength of 120,350 psi and minimum yield of 95,700 psi, hardness Rockwell C23-34. That is the common structural-duty metric class and it is what the JMHTB1245 is intended for, including mounting motors to machinery and automotive and truck repair work. For higher preload applications you would step up to class 10.9 or 12.9 instead.

These are steel with a zinc finish. Zinc plating is a sacrificial coating meant for indoor and sheltered service, mechanical rooms, equipment skids, and HVAC and plumbing work. Continuous outdoor exposure, washdown, or coastal air will eventually corrode plated carbon steel, so for those openings use a hot dip galvanized or stainless fastener instead.

It ships as a jar of 50 pieces, and 50 each is the order minimum. There is no loose or break-pack count on this one, so if you only need a handful for a single motor mount you are still buying the full jar. Other sizes and quantities are available by request.

No. The JMHTB1245 is not Buy American compliant and is not ARRA compliant, with country of origin listed as multiple. If your contract carries a domestic sourcing clause, this fastener will not satisfy it.

A tap bolt is what you want when the fastener threads directly into a tapped hole or when the clamped stack is thick enough that you need thread all the way down. A partially threaded hex cap screw puts an unthreaded shoulder in the grip, which is better for shear across a joint but wastes length in a deep tapped hole. The Metallics M12 x 45 class 8.8 tap bolt is the fully threaded version, with a washer face under the hex head, and it is used for electrical, plumbing, heating and air conditioning work as well as motor mounting.