Metallics JHTBG59 3/8-16 x 1-1/4 Hx Tap Blt Galv

It is a tap bolt, which means the thread runs the full length of the shank up to the hex head, with no unthreaded shoulder. That is what you want when you are bolting into a tapped hole, a channel nut, or thin material where a partially threaded hex cap screw would leave bare shank in the joint. Full thread over 1-1/4 inches of length.

The JHTBG59 is galvanized, so the zinc coating gives it corrosion resistance suited to damp interior rooms, unheated spaces, and general exterior use. For continuously wet, coastal, or chemically aggressive locations, buyers typically step up to stainless. Keep galvanized hardware with galvanized nuts and washers so you are not mixing a bare steel fastener into a coated assembly.

It is a 3/8-16 x 1-1/4 galvanized hex tap bolt, the fastener electricians reach for when hanging strut, conduit supports, pipe clamps, box brackets, and trapeze hangers. The 3/8-16 thread matches the spring nuts and channel nuts used with standard strut, and the 1-1/4 inch length suits single-layer clamp and bracket stacks rather than deep build-ups.

Allow for your full stack. With 1-1/4 inches of usable length you can clear a strut channel wall, a washer, and a typical conduit clamp ear, but a combination of thick backplates, two washers, and a channel nut will run you short. Measure the total material thickness plus enough thread to fully engage the nut, and move up a length if the sum exceeds 1-1/4 inches.

A 3/8-16 bolt in standard inch hex sizing takes a 9/16 inch wrench or socket across the flats. The JHTBG59 has a hex head, so it drives with a standard socket, box wrench, or impact rather than any special bit.

Ordering is by the Metallics part number JHTBG59, which is the 3/8-16 x 1-1/4 galvanized hex tap bolt. That single model designation covers the item, so specify JHTBG59 and the quantity you need for the run.