B-Line Eaton series beam clamps, 2000 lb, Steel, Safety factor of 5, setscrew included, Beam clamp, 5/8"-11 thread/rod size, 5/8"-11 screw size, 1-11/

The B321-4ZN takes 5/8"-11 threaded rod, and the included setscrew is the same 5/8"-11 size. If your trapeze or single-rod hanger run is 1/2"-13 or 3/8"-16, this clamp will not accept it without a rod coupling change, so match the rod to 5/8"-11 before ordering.

Rated load is 2000 lb, published with a safety factor of 5. That is the rating for the clamp itself; the beam flange, the 5/8"-11 rod, and the rest of the hanger assembly all have to be good for the same load, and the lowest-rated component in the chain governs what you can actually hang.

The B321-4ZN is steel with an electro-plated zinc finish. That is a dry indoor-service finish, fine for mechanical rooms, ceilings, and interior conduit runs. For exterior, damp, or corrosive locations you want a hot-dip galvanized or stainless beam clamp instead, since electro-zinc plating is thin and will bloom rust once it is exposed to weather or washdown.

No drilling or welding. A beam clamp like this one grips the beam flange and the setscrew locks it in place, leaving the structural steel untouched, which is usually what the structural engineer and the building owner both want. The 5/8"-11 rod then threads into the clamp body to carry the hanger below.

Order it as Eaton B-Line B321-4ZN. That designation covers the steel, electro-plated zinc clamp with the 5/8"-11 thread and the setscrew included. Quote the full suffix, since the B321 body is built in more than one rod size and finish.

Plan for the clamp footprint of 3.71875 x 3.25 x .625 inches, plus room to get a wrench on the setscrew and to thread the rod in from below. Each clamp weighs 2.39 lb, which matters when you are pricing out a hundred hangers for a job and figuring what a crew carries up a lift.