Metallics JCB31 Bolts 1/4-20 X 6 Carriage Blt St-zn (Jar 25)

Rated 60,000 psi minimum tensile and 36,000 psi minimum yield, with hardness Rockwell B70 to B100. Dimensions conform to ASME B18.5-1990, the round head bolt standard, so the head and square neck will match a standard counterbore or an existing carriage bolt hole pattern. That strength level is a general service grade, so if your drawing calls out a graded structural bolt, this is not the substitute.

No. The JCB31 is not Buy American compliant and is not ARRA compliant, with country of origin listed as multiple. On a federally funded project with domestic sourcing requirements you will need a domestic-origin fastener instead.

Overall fastener length is 6 inches measured under the head, and carriage bolts are threaded on the lower portion of that shank. Figure your stacked material thickness plus enough thread showing for a washer and nut. For a 6 inch bolt you have plenty of room through doubled framing lumber, strut assemblies, or bracket-to-timber connections. Nuts and washers are not included.

It is zinc plated steel, which handles indoor, dry, and occasionally damp service. Zinc plating is a sacrificial coating, not stainless, so for permanently wet, coastal, or treated-lumber exposure where the plating will be attacked, specify a stainless 18-8 or 316 carriage bolt instead.

They ship 25 to a jar, and 25 each is the order minimum, so that jar is the smallest buy. Other sizes and quantities can be supplied by request.

Yes. It is a right hand 1/4-20 thread, 20 threads per inch, so any standard 1/4-20 hex nut, nylon insert lock nut, or flange nut fits. Pair it with a flat washer under the nut when you are bolting into wood so the nut does not crush into the grain.

It is stocked for the electrical, plumbing, heating, and air conditioning trades, typically hanging or anchoring equipment and supports where the long smooth shank and a flat mushroom head are wanted on the finished side. The domed head sits nearly flush with nothing to snag, and the square neck locks it so one wrench at the nut does the whole job, which is why it gets used in overhead and blind-side work.