Metallics JCB37G Bolts 3/8-16 x 5-1/2 Carriage Blt Ga (Jar 25)

Yes. The JCB37G is a galvanized steel carriage bolt, so the zinc coating gives it corrosion resistance for exterior framing, fence rails, dock and deck work, and damp utility rooms. For indoor-only dry work a plain zinc-plated bolt is fine, but galvanized is the one you want where water hits it.

It is a 3/8-16 bolt, 16 threads per inch, with a shank outside diameter measured at 0.360 to 0.388 inch. Any 3/8 nut cut to that same 16 TPI pitch will thread on, and a galvanized nut and washer are the usual pairing so the coatings match.

Carbon steel with 36,000 psi minimum yield strength and a hardness of Rockwell B70 to B100. That is standard low carbon carriage bolt territory, right for general framing, fence, bracket and strut anchoring. If an engineer's drawing calls out a higher grade, that calls for a Grade 5 or Grade 8 bolt rather than this one.

Metallics lists the JCB37G as both ARRA compliant and Buy American compliant, which is what a government, school or healthcare procurement officer needs on the submittal. Country of origin is recorded as multiple, so if your contract requires a single named origin on the paperwork, confirm the origin of the specific lot.

Use the carriage bolt, like the JCB37G, when one face has to stay smooth and you can only get a wrench on one side: the mushroom head sits nearly flush and the square shoulder keeps it from turning in the wood. Use a hex bolt when you are going through steel, when you need to torque to a value, or when you need to hold the head with a wrench while turning the nut.

Galvanized is the right call there. Modern treated lumber chemistry is corrosive to bare steel, and the zinc coating on the JCB37G is the standard answer for it. Pair it with galvanized nuts and washers, and keep bare or plain plated hardware out of treated wood.