Metallics JMHTB310 Bolts M3 x 10 C8.8 Hx Tap Blt St-zn (Jar 100)

It's an M3 metric bolt, 10mm long under the head, with a 0.5mm thread pitch, which is the standard coarse pitch for M3. Threads are right hand and run the full length of the shank right up to the washer face beneath the hex head, so there is no unthreaded grip section to worry about on a 10mm bolt.

That's the intended use. The JMHTB310 is a Class 8.8 medium carbon steel bolt, heat treated to Rockwell C22-32, and Metallics lists motor-to-machinery mounting as its primary application along with automotive and truck repair. Class 8.8 is the common metric equivalent of an SAE Grade 5 bolt, so it's a general-purpose structural fastener rather than a low-strength commercial bolt.

No. The JMHTB310 hex tap bolt is not Buy American compliant and is not ARRA compliant, and country of origin is listed as multiple. If your contract carries a domestic sourcing clause, this item will not satisfy it.

A tap bolt is threaded the entire length of the shank; a standard hex cap screw leaves part of the shank unthreaded. Full threading is what you want when you are threading into a tapped hole of unknown depth, or clamping a thin stack where a partially threaded bolt would bottom out its grip section before it tightened. On the JMHTB310 the threads run all the way to the washer face under the hex head.

Yes for dry indoor and protected work. The bolt is steel with a zinc finish, and Metallics lists it for the electrical, plumbing, heating and air conditioning trades. Zinc plating is a light sacrificial coating, not a marine or constant-wet solution, so for exposed outdoor or washdown locations step up to stainless or hot dip galvanized.

It ships as a jar of 100 pieces, and 100 in the jar unit of measure is the order minimum, so the jar is the smallest purchasable quantity. The jar packaging keeps small M3 hardware together on a service truck instead of loose in a bin.

The head has an integral washer face on its underside, which gives a clean bearing surface against the part. That is not a substitute for a flat washer when you are clamping soft material, slotted holes, or an oversized hole, and it does nothing for vibration, so add a lock washer or thread locker where the joint sees movement.

Yes. The JMHTB310 is the M3 x 10 item in the Metallics MHTB and JMHTB tap bolt series, and other sizes and quantities are available by request, so you can standardize a whole panel or equipment build on the same head style and Class 8.8 material across multiple diameters and lengths.