Metallics JMHTB520 Bolts M5 x 20 C8.8 Hx Tap Blt St-zn (Jar 100)

Full thread. The JMHTB520 is a tap bolt, so the M5 thread runs the entire 20mm length right up to under the head, where there's a washer face. That matters when you're bolting into a tapped hole or a blind hole and need thread engagement at every depth, rather than a partially threaded hex cap screw that leaves a smooth shoulder at the top.

Grade 8.8 here 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's the metric equivalent class to a Grade 5 inch bolt, so it's a structural-duty fastener suitable for motor mounting and equipment work rather than a low-grade commercial bolt.

The pitch is 0.8mm, right hand, which is the standard coarse pitch for M5. It will run into any standard M5 coarse tapped hole or M5 coarse nut. If the equipment you're working on was tapped M5 x 0.5 fine, this is not the bolt for it.

No. The JMHTB520 is not Buy American compliant and not ARRA compliant, with country of origin listed as multiple. If you're buying for a federal, state or institutional job with domestic sourcing language in the spec, this bolt will not satisfy it and you'll need a domestically produced fastener.

It ships as a jar of 100 pieces, and the jar is the order minimum, so 100 is the smallest buy. Jar packaging keeps small M5 hardware contained on a service truck or in a shop drawer instead of loose in a bin. Metallics does make the MHTB and JMHTB tap bolt series in other sizes and pack quantities by request.

The JMHTB520 is steel with a zinc finish, which is a general purpose coating for dry indoor and sheltered work, mechanical rooms, equipment frames, panel and motor mounting. Zinc plate is not a marine or sustained wet-exposure coating, so for roof curbs, exterior condensing units or wash-down areas, go to stainless or hot dip galvanized hardware instead.

It's a hex head bolt, and the head width is listed at 7.78 to 8mm across the flats, so an 8mm socket or wrench is what you want on it. M5 class 8.8 hex bolts are standardly 8mm across flats.

Metallics lists it for electrical, plumbing, heating and air conditioning work. The common use is mounting a motor to machinery, and it's also widely used in automotive and truck repair. Think blower motor mounting, equipment and enclosure fastening, and small machine assembly where an M5 tapped hole is already there.

A full jar of 100 comes in at 399 g, so roughly 14 oz. Light enough to carry several sizes of the MHTB and JMHTB series on a van without weight being a factor.