Metallics JMHTB640 Bolts M6 X 40 C8.8 Hx Tap Blt St-zn (Jar 100)

Yes. The JMHTB640 is a tap bolt, so the M6 thread runs the full 40 mm of the shank right up to the underside of the head. That matters when you are clamping thin material or bolting into a tapped hole where a partially threaded hex cap screw would bottom out its unthreaded shank before the head seats. It also carries a washer face under the head for a cleaner bearing surface.

It is a 1.0 mm pitch, right hand thread, which is the standard coarse pitch for M6. So it mates with any ordinary M6 coarse nut or M6 x 1.0 tapped hole. If your equipment is tapped M6 x 0.75 fine, this bolt will not thread in.

Class 8.8 is the medium carbon, heat treated metric grade. On this bolt it works out to 120,350 psi minimum tensile and 95,700 psi minimum yield, with a hardness of Rockwell C23-34. That is the grade normally specified for mounting motors to machinery and for automotive and truck repair work, which is exactly what this bolt is sold for. It is a structural-duty fastener, not a general purpose class 4.8 bolt.

The JMHTB640 ships as a jar of 100 pieces, and 100 is the order minimum, so the jar is the smallest unit sold. The filled jar weighs 962 g. Other sizes and quantities in the MHTB and JMHTB series are available by request.

The JMHTB640 is steel with a zinc finish, which is a mild corrosion barrier meant for indoor and protected service, the sort of thing you use on electrical, plumbing, heating and air conditioning work inside a building. It is not stainless. For sustained wet exposure, coastal air, or chemical washdown, specify a stainless or hot dip galvanized fastener instead.

No. The JMHTB640 is not Buy American compliant and is not ARRA compliant, and its country of origin is listed as multiple. If your project carries a domestic sourcing clause, this bolt will not qualify for the submittal.