B-Line Eaton series imperial cable tray and ladder, 6" Height, 21.0625" Length, 12" Width, Series 2-5 horizontal bend, Aluminum, 90° Angle, 12" Radius

Yes, that is exactly what it is sized for. The 6A-12-90HB12 is a Series 2-5 horizontal bend built at 12 inch tray width and 6 inch side rail height, so it drops into a run of the same width and depth. Width and height both have to match the straight sections you are tying into, or the rails will not line up at the splice.

A horizontal bend is the correct part when the run stays at the same elevation and changes direction left or right, which is what this 90 degree, 12 inch radius Series 2-5 fitting does. If you are changing elevation instead, going up and over an obstruction or dropping to a panel, you need a vertical inside or outside bend, not this. For a three-way or four-way split you want a tee or cross in the same 12 inch width.

Allow 21-1/16 inches of length off the centerline of the run. That is the fitting's stated length dimension on a 12 inch radius, 12 inch wide body, so lay it out from the last straight section with that clearance in each leg of the turn before you set your hangers.

Aluminum. That is the main reason contractors pick this fitting over a steel one: it is light to set overhead, and aluminum handles damp and corrosive environments without the coating maintenance galvanized steel needs. If your spec calls for steel tray, this will not satisfy it, since mixing aluminum and steel in the same run creates a dissimilar-metal connection at the splice.

What you are ordering under part number 6A-12-90HB12 is the bend body itself. Splice hardware, hangers, and any covers are separate line items, so add them to the order along with the fitting if your run does not already have spares on site.

9.6 pounds. A single installer can set it on the trapeze and hold it while starting the splice bolts, which is the practical advantage of the aluminum body over an equivalent steel fitting.