Metallics JMHTB8351 Bolts M8 x 35 C10.9 Hx Tap Blt St-zn (Jar 100)

It's an M8 bolt with a 1.25 mm thread pitch, right-hand thread, 35 mm long under the head. That 1.25 pitch is the standard coarse metric pitch for M8, so it mates with standard M8 coarse nuts and tapped holes. Shank diameter runs 7.78 to 8 mm.

Yes. The JMHTB8351 is class 10.9, rated 150,800 psi minimum tensile and 136,300 psi minimum yield, hardness Rockwell C32-39. Class 8.8 is the common general-purpose metric grade; 10.9 is the step up used where higher tensile capacity is needed, such as automotive and fleet work. The trade-off is that higher-strength heat-treated steel is less forgiving of over-torque and notching, so torque it to the joint spec rather than by feel.

Yes, the threads run the full 35 mm up to directly beneath the head, which is what makes it a tap bolt rather than a partly threaded hex cap screw. Full thread means you get maximum engagement in a shallow tapped hole or in a thin strut channel nut, but there is no unthreaded shank body to take shear across a joint line, so for pure shear applications a partly threaded hex bolt sized so the plain shank crosses the faying surface is the better choice.

No. The JMHTB8351 is not Buy American compliant and is not ARRA compliant, with multiple countries of origin. If your project has domestic-content requirements on fasteners, this bolt won't satisfy them.

The hex head measures 12.73 to 13 across the flats, so a 13 mm socket or wrench is the fit. Head height is 5.15 to 5.45. There is a washer face under the head, which gives a clean bearing surface against the part being clamped.

The bolt is steel with a zinc finish, which handles indoor and sheltered damp conditions, the electrical, plumbing, heating and air conditioning work it's intended for. Zinc plating is a sacrificial coating, not stainless, so in sustained outdoor exposure, washdown areas, or coastal salt it will eventually corrode. For those openings go stainless or hot-dip galvanized instead.

They come in a jar of 100 pieces, and the jar is the minimum order unit, so 100 bolts is the smallest quantity. The packed jar weighs 1701 g. Metallics lists other sizes and quantities in the MHTB and JMHTB series on request if 35 mm isn't the length you need.

JMHTB8351 is the part number, in the Metallics MHTB and JMHTB hex metric tap bolt series. The J prefix is the jarred pack of 100; the MHTB numbers cover the same bolt in other pack configurations.