Metallics JMHTB850 Bolts M8 x 50 C8.8 Hx Tap Blt St-zn (Jar 100)

The JMHTB850 is an M8 bolt with a 1.25 mm thread pitch, which is the standard coarse metric pitch for M8, and the threads are right hand. Shank length is 50 mm. Because it is a tap bolt, the thread runs all the way up to directly under the head, so it works in tapped holes of any usable depth rather than needing a specific grip length.

Yes. The JMHTB850 is Property Class 8.8 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 is exactly what the bolt is intended for, mounting motors to machinery as well as automotive and truck repair work.

Full thread. On this tap bolt the threads run the entire shank right up under the head, unlike a standard hex cap screw that leaves an unthreaded grip. That matters if your joint relies on a smooth shank taking shear in a reamed hole, in that case a partially threaded cap screw is the correct part. For blind tapped holes and through-bolted brackets, full thread is what you want.

It ships in a jar of 100 pieces, and the jar is the minimum order unit, so you buy in multiples of 100. Jar weight is 2159 g. Metallics also offers other sizes and quantities in the MHTB and JMHTB series on request if 100 pieces of M8 x 50 is not the count you need.

The JMHTB850 is medium carbon steel with a zinc finish. Zinc plating handles indoor and sheltered service well, which covers the electrical, plumbing, heating and air conditioning work this bolt is sold for. For continuous wet exposure, salt spray, or direct weather, plated carbon steel is not the right choice and you want stainless or hot dip galvanized instead.

Not for bearing surface. It is a hex head fastener with a washer face formed beneath the head, so it already presents a finished bearing surface against the part. Add a washer only if you are spanning a slot or oversized hole, or protecting a soft or painted surface.

No. The JMHTB850 is not Buy American compliant and is not ARRA compliant, and country of origin is listed as multiple. If your contract carries a domestic sourcing clause, this bolt will not satisfy it and you need a domestically produced fastener.