B-Line Eaton series imperial cable tray and ladder, 6" Height, 27" Length, 24" Width, Series 2-5 horizontal tee, Aluminum, 12" Radius

Aluminum. That keeps the fitting light for overhead work (20.5 lb) and is the usual pick where you want corrosion resistance without galvanizing. Match the fitting material to the tray run: aluminum fittings go on aluminum tray, both for corrosion reasons and because the splice hole patterns are made to suit.

Plan for 27 inches of length along the main run, 24 inches across the tray, and 6 inches of rail depth. On a 12 inch radius tee the branch turns out within that envelope, so keep the area clear of ductwork and hangers before you cut the straight sections in.

A horizontal tee splits one run into two branches in the same plane, a three-way fitting. A cross gives you four legs from one point. The 6A-24-HT12 is the tee, so use it where a feeder run drops a single branch off to one side and continues straight through. If your layout has branches leaving both sides at the same point, you want a cross instead.

The tee is supplied as the fitting itself at 20.5 lb. Splice plates and their bolt hardware are ordered separately, and you'll need a set at each of the three connections where the tee meets the straight tray sections. Match the splice type to the same Series 2-5 aluminum tray the fitting is built for.

Order Eaton B-Line 6A-24-HT12. The number reads out as 6 inch rail, aluminum, 24 inch width, horizontal tee, 12 inch radius, which is how the rest of the Series 2-5 fitting line is coded too.