Metallics JMHTB820 Bolts M8 X 20 C8.8 Hx Tap Blt St-zn (Jar 100)

Yes. The JMHTB820 is a hex tap bolt, which means the thread runs the full 20mm length right up under the head, with no unthreaded shank. That matters when you need thread engagement at the very top of a through-hole or when you are clamping a thin bracket and cannot afford a grip length. The head has a washer face underneath it.

It is M8 with a 1.25mm pitch, right hand thread. That is the coarse metric pitch, so it mates with any standard coarse M8 nut or M8 x 1.25 tapped hole. If your equipment is tapped for the fine M8 x 1.0 pitch, this bolt will not thread in.

Class 8.8 is the common medium-strength metric grade, made from medium carbon steel and heat treated. On the JMHTB820 that 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 these are sold for.

No. These bolts are not Buy American compliant and are not ARRA compliant, and country of origin is listed as multiple. On a federally funded project with domestic sourcing requirements you need a documented domestic fastener instead.

They ship 100 per jar, and the jar is the minimum order unit, so you buy in full jars rather than by the piece. A full jar weighs 1352 g.

The JMHTB820 is steel with a zinc finish. Zinc plating is a general-purpose corrosion coating suited to indoor and protected mechanical rooms, equipment rooms and vehicle work. For sustained outdoor exposure, washdown or coastal service, spec a stainless or hot dip galvanized fastener instead.

Hex head, and the head measures 12.73 to 13 across the flats, so a 13mm socket or wrench is the driver. Head height runs 5.15 to 5.45.

Metallics lists the MHTB and JMHTB series for the electrical, plumbing, heating and air conditioning trades. Typical use is bolting motors to machinery, plus automotive and truck repair. It is a general equipment-mounting fastener rather than a structural or anchoring bolt.

The JMHTB820 is the M8 x 20 in a 100-count jar, and Metallics offers other sizes and quantities in the MHTB and JMHTB series by request. If you need a longer M8 or a bulk box rather than a jar, ask for the size you need in the same series.