Metallics JMHTB510 Bolts M5 X 10 C8.8 Hx Tap Blt St-zn (Jar 100)

The JMHTB510 is an M5 bolt with a 0.8 mm thread pitch, right-hand thread, so it threads into a standard M5 x 0.8 coarse tapped hole or nut. Thread length is the full 10 mm shank, running right up under the head (that is what makes it a tap bolt rather than a partially threaded cap screw).

Grade 8.8 is the class here, a medium carbon steel bolt that has been heat treated, with hardness of Rockwell C22-32 and a stated yield of 92,800 psi minimum. Motor-to-machinery mounting is one of the listed uses for it, along with automotive and truck repair work. For a structural steel connection you would be looking at a different fastener class, but for equipment mounting at M5 this is the usual medium-strength metric choice.

No. These tap bolts are not Buy American compliant and are not ARRA compliant, with country of origin listed as multiple. If your project carries domestic sourcing requirements, this is not the fastener to specify.

These ship as a jar of 100 pieces, and the jar is the minimum order unit, so 100 is the smallest quantity. Other sizes and quantities in the MHTB and JMHTB tap bolt series are available by request.

It is a hex head fastener, and the head measures 8 across the flats with a head height in the 3.35 to 3.65 range, so an 8 mm socket or wrench drives it. There is a washer face under the head, which seats flat against the part without needing a separate flat washer for bearing.

The finish is zinc plated steel, which is a mild corrosion barrier meant for dry indoor and sheltered service. It holds up fine inside electrical enclosures, mechanical rooms, and on HVAC and plumbing equipment, which are the industries this bolt is catalogued for. For sustained wet, washdown, or coastal exposure, go to a stainless fastener instead, because plated carbon steel will eventually rust through the coating.

Shank length is 10 mm total, fully threaded. That is short, so it suits thin sheet metal brackets, enclosure panels, and tapped bosses where you only need a few millimeters of material plus thread engagement. For anything thicker, step up to a longer length in the same MHTB and JMHTB tap bolt series rather than stacking washers.

A jar comes in at 281 g. Useful if you are packing a service van or batching out small-parts kits by weight.