B-Line Eaton series strut channel, nuts, all threaded rod, Steel, Spring nut , Yellow zinc chromate

It's a mini channel spring nut, not a nut for full-size 1-5/8 inch strut. The body measures .525 inch wide and .721 inch long, which is sized to turn into the smaller mini channel opening. Drop it into standard 1-5/8 inch strut and it won't grip the inturned lips properly, so for full-size channel you need a standard-size strut nut instead.

The BMM-6SYZN is steel with a yellow zinc chromate finish, which is a coating meant for dry indoor and protected service. It's fine inside a building, in ceiling spaces, and in typical electrical rooms. For exterior runs, wash-down areas, or anywhere with standing moisture or chemical exposure, specify a hot-dip galvanized or stainless mini channel nut instead.

You get the nut only. It's a spring nut, so the spring is part of the assembly, but the bolt or threaded rod that clamps into it is a separate order. Plan your fastener and any washers alongside it when you're pricing out a hanger run.

Order by MPN BMM-6SYZN. That designation covers the Eaton B-Line mini channel spring nut in steel with the yellow zinc chromate finish, so matching it keeps the finish and body size consistent with what is already installed on the run.

Yes, threaded rod support is one of its intended uses along with general strut channel attachment. The spring holds the nut in place in the mini channel while you bring the rod or bolt up to it, which is what lets one person set a hanger without reaching behind the channel.

The nut body stands .425 inch tall, so the channel interior has to clear that height once the nut is turned into position. Each piece weighs .012 lb, which matters when you're estimating bulk quantities for a large hanger or cable tray support package rather than any single connection.