Metallics JMHTB68 Bolts M6 x 8 C8.8 Hx Tap Blt St-zn (Jar 100)

It's an M6 metric hex tap bolt with a 1.0 mm thread pitch and right-hand threads. The thread runs all the way up to directly beneath the head, which is what makes it a tap bolt rather than a partially threaded hex cap screw. Shank diameter measures 5.82 to 6 mm.

8 mm. That's a short bolt, so it suits thin material stack-ups, tapped blind holes, and bolting a motor foot or bracket where you only have a few millimeters of grip. If you need more grip length, this is the wrong length in the MHTB and JMHTB series and you want a longer M6 from the same family.

Class 8.8 is the metric property class for medium carbon steel that's been quenched and tempered, roughly the metric counterpart to SAE Grade 5. This bolt is heat-treated medium carbon steel and tests at Rockwell C22-32. It's the usual choice for motor mounts, equipment brackets, and automotive or truck repair work. For structural steel connections you'd be specifying a different fastener entirely.

No. The JMHTB68 hex tap bolt is flagged as not Buy American compliant and not ARRA compliant, with country of origin listed as multiple. If your contract carries Buy American, Build America Buy America, or ARRA domestic-content language, these bolts won't satisfy it and you need a domestically sourced fastener for that scope.

The head is formed with a washer face underneath it, so it seats cleanly on a flat machined surface without a flat washer. On soft material, oversized holes, or slotted brackets you still want a flat washer to spread the load, and a lock washer or thread locker if the joint sees vibration. No washers are included in the jar.

They ship in a jar of 100 pieces, and the jar is the order minimum, so 100 is the smallest quantity. Jar packaging keeps small M6 hardware together on a service truck or in a shop bin better than a loose bag. Other sizes and quantities in the MHTB and JMHTB series can be had by request.

The finish is zinc plating over steel, which handles indoor and protected mechanical rooms, panel work, and equipment mounting. Zinc plate is a sacrificial coating and it will corrode out in sustained weather exposure, wash-down areas, or coastal air. For a rooftop condensing unit or anything genuinely exposed, go to hot dip galvanized or stainless instead of this one.

It's carried for electrical, plumbing, heating, and air conditioning work, and it's a common motor-to-machinery mounting bolt. Think securing a blower motor, strapping down a small pump or fan assembly, or any tapped-hole bracket where metric hardware is already in place. MRO and facilities crews buy it by the jar as bin stock rather than per job.