Metallics RCT29G Rod Coupling 1/2-13 Hx Galv (Jar 50)

The RCT29G coupling is threaded 1/2-13, so it joins 1/2 inch threaded rod with standard UNC coarse thread (13 threads per inch). Rod of any other diameter or a fine-thread 1/2-20 rod will not thread into it.

No. The RCT29G is tapped 1/2-13 only, and 3/8 inch rod will spin loose inside it with no thread engagement. For 3/8 inch drops you need a 3/8-16 coupling instead.

It is a hex body coupling, so you can run it down with a standard wrench or socket instead of turning it by hand. That matters when you are splicing rod overhead on trapeze or fixture hangers and need to snug the joint.

The RCT29G is galvanized, which is the usual choice for damp, unheated, or exposed interior runs such as parking structures and mechanical rooms. For continuously wet or corrosive environments, stainless rod hardware is the better specification.

They ship 50 pieces to a jar, packaged as a jar pack. That is a bulk count sized for a hanger or seismic bracing job rather than a one-off repair, so plan the order around multiples of 50.

A coupling like the RCT29G splices two lengths of 1/2-13 threaded rod end to end, so you can extend a hanger drop without buying a longer rod, or join rod stock left over from other drops. Typical uses are strut and trapeze hangers, lighting fixture supports, and conduit hanger rods. Thread both rod ends in until they meet inside the body so the joint carries through the full nut length.