Metallics JMHTB8401 Bolts M8 x 40 C10.9 Hx Tap Blt St-zn (Jar 100)

Yes. The JMHTB8401 is a hex tap bolt, meaning the thread runs the full length of the shank right up to under the head, with a washer face beneath the head. That matters if you're clamping a thick stack or want thread engagement anywhere along the 40mm length rather than a plain shoulder section.

The pitch is 1.25mm, right hand thread, which is the standard coarse pitch for M8. Any standard M8 coarse nut or tapped M8 hole will take it. If your hole is M8 x 1.0 fine pitch, this is the wrong bolt.

Class 10.9 is a heat-treated high alloy steel grade rated at 150,800 psi minimum tensile and 136,300 psi minimum yield, with a hardness of Rockwell C32-39. You step up to 10.9 where a Class 8.8 fastener does not give you enough tensile capacity, typical of automotive and fleet work and heavier equipment mounting. For general bracket and strut work an 8.8 is usually sufficient.

No. This bolt is not Buy American compliant and not ARRA compliant, and country of origin is listed as multiple. If your contract carries domestic sourcing requirements, you'll need a domestically produced fastener instead.

It ships as a jar of 100 pieces, and 100 is the order minimum. The jar weighs 1846 g, so figure roughly 18 grams per bolt if you're estimating freight on multiple jars.

The bolt is steel with a zinc finish. Zinc plating handles indoor and sheltered mechanical, electrical, plumbing and HVAC work, which is the application range Metallics lists for it. For sustained outdoor exposure, washdown, or coastal conditions, go to hot-dip galvanized or stainless instead; plated zinc on an alloy steel bolt will corrode.

It's a standard hex head on an M8 metric bolt, so a 13mm socket or wrench is the size to reach for. Metallics lists the head width at 12.73 to 13 and head height at 5.15 to 5.45.

Nominal M8, with the thread outside diameter running 7.78 to 8. Length under the head is 40mm, all of it threaded, so your usable grip is whatever your material stack plus nut and washer consume out of that 40mm.

Yes, the MHTB and JMHTB series covers other sizes and quantities by request. The JMHTB8401 specifically is the M8 x 40 in a 100-piece jar; the MHTB prefix covers the same bolt in alternate packaging.