Metallics JMHTB620 Bolts M6 X 20 C8.8 Hx Tap Blt St-zn (Jar 100)

Yes, it's a tap bolt, so the thread runs the full length of the shank right up under the head. That matters when you're bolting through a thin bracket or into a tapped hole and want thread engagement everywhere along the 20mm length, rather than a partially threaded shoulder bolt that leaves a smooth shank in the grip.

The pitch is 1.0mm, right hand thread, which is standard coarse for M6. If the tapped hole or nut you're mating to is M6 x 1.0, it goes together. A fine-pitch M6 x 0.75 hole will not accept it.

Class 8.8 is 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's the grade commonly used to mount motors to machinery and in automotive and truck repair work, which is exactly what these are sold for. For a structural or high-shock application calling for Class 10.9 or 12.9, this is the wrong grade.

No. The JMHTB620 is not Buy American compliant and is not ARRA compliant, with country of origin listed as multiple. On a federally funded job with domestic sourcing requirements, you'll need a domestically produced fastener instead.

They're steel with a zinc finish. Zinc plating handles indoor and sheltered mechanical room conditions fine, which is the environment these are aimed at across electrical, plumbing, heating and air conditioning work. For direct outdoor exposure, standing water, or coastal air, you want stainless or hot dip galvanized instead of zinc plated steel.

One hundred bolts per jar, and the jar is the order minimum. The packed jar weighs 635 grams. Metallics lists other sizes and quantities in the MHTB and JMHTB series by request.

It has a washer face formed under the hex head, so it bears cleanly on a flat machined surface without an added washer. If you're clamping soft material, slotted holes, or oversized clearance holes, add a flat washer anyway to spread the load.