Metallics JMHTB8501 Bolts M8 X 50 C10.9 Hx Tap Blt St-zn (Jar 25)

It's an M8 by 50mm hex tap bolt with a 1.25mm thread pitch, right-hand thread. The 1.25 pitch is the standard coarse metric pitch for M8, so it threads into standard M8 coarse nuts and tapped holes.

Fully threaded. The threads run the full length of the shank right up to directly beneath the head, which is what makes it a tap bolt rather than a partially threaded hex cap screw. Use it where you need thread engagement over the whole grip, or where a shouldered bolt would leave unthreaded length in a tapped hole.

Class 10.9 is the higher-strength metric grade. This bolt is rated 150,800 psi minimum tensile and 136,300 psi minimum yield, with a hardness of Rockwell C32-39. Metallics calls it out for automotive and fleet work where a class 8.8 fastener doesn't give enough tensile strength. Don't substitute an 8.8 into a joint specced for 10.9.

High alloy steel, heat treated, with a zinc finish. Zinc plating is a mild corrosion barrier suited to dry or sheltered conditions and general indoor industrial use. For direct weather exposure, washdown, or coastal sites, a hot-dip galvanized or stainless fastener is the better call. Note also that zinc-plated high-strength bolts should not be hot-dip regalvanized or welded.

These ship 25 to a jar, and 25 count is the order minimum. Metallics notes other sizes and quantities are available by request, so if you need a different length or a bulk box of M8 x 50, it can be sourced rather than ordered as multiple jars.

The hex head is formed with a washer face underneath it, which gives a clean, flat bearing surface against the joint. On a class 10.9 bolt in softer material you'll still normally want a hardened flat washer to spread the clamp load, since 10.9 bolts are tightened to high torque and can embed into aluminum or thin sheet. Washers and nuts are not included with the jar.

Metallics flags this item as both ARRA compliant and Buy American compliant in its product data, with country of origin listed as China. For a federally funded job, check which compliance clause your contract actually invokes, since the two programs are not interchangeable.

The packed jar weighs 553 g. That's the full 25 count container, useful if you're building out a van stock list or a shipment weight.