Metallics JMHTB410 Bolts M4 X 10 C8.8 Hx Tap Blt St-zn (Jar 100)

It's an M4 bolt with a 10mm length under the head and a 0.7mm thread pitch, which is the standard coarse metric pitch for M4. The threads are right hand and, being a tap bolt, they run the full length of the shank right up to the washer face beneath the hex head.

Class 8.8 is the common medium-strength metric grade, roughly the metric counterpart to SAE Grade 5, and the JMHTB410 is medium carbon steel that has been heat treated to Rockwell C22-32. Metallics lists motor-to-machinery mounting as a primary use, along with automotive and truck repair. For structural or high-preload joints calling out class 10.9 or 12.9, this is not the bolt.

A tap bolt is threaded the entire length of the shank with no unthreaded grip, which is what the JMHTB410 is. That matters when you are threading into a tapped hole in a casting or motor housing, because a partially threaded bolt this short could bottom out on its grip before it clamps. At 10mm long you also need to confirm your tapped hole has at least that much usable depth.

No. These are not Buy American compliant and are not ARRA compliant, with country of origin listed as multiple. On a federally funded job with domestic sourcing requirements you will need a domestically produced fastener instead.

No. The JMHTB410 is a metric M4 with 0.7mm pitch, and metric threads will not mate with inch series threads like 1/4-20 or #8-32 no matter how close the diameters look. M4 is close to a #8 in diameter, which is exactly how people cross-thread holes. Match the hole to metric M4 x 0.7 or order the inch equivalent.

These ship in a jar of 100 pieces, and the jar is the minimum order unit, so you buy in multiples of 100. The filled jar weighs 177 g. Metallics notes other sizes and quantities are available by request if you need a different count or length.

The finish is zinc plated steel, which handles indoor and sheltered conditions and incidental moisture but is not a marine or sustained-wet finish. For rooftop units, coastal sites, or anything washed down regularly, step up to a stainless or hot-dip galvanized fastener instead. Metallics lists these for electrical, plumbing, heating and air conditioning work.

Not for bearing purposes on a flat machined surface, since this hex head has an integral washer face beneath it. Add a flat washer if you are clamping soft material, sheet metal, or an oversized or slotted hole where you need to spread the load.