B-Line Eaton series imperial cable tray and ladder, 6" Height, 33" Length, 12" Width, Series 2-5 horizontal tee, Aluminum, 24" Radius

That is exactly what it is built for. The 6A-12-HT24 is a Series 2-5 horizontal tee with a 12 inch width and 6 inch side rail height, so it matches a 12 inch wide, 6 inch deep tray run. It is aluminum, so it mates with aluminum tray of the same series and depth rather than a steel run. Straight-section width and rail height both have to match, not just the width.

It is a 24 inch radius fitting. The radius sets the minimum bend the cables take through the branch, so on runs with large power conductors that have a big minimum bend radius, a 24 inch fitting keeps the cable inside its allowable bend where a 12 or 24 inch shorter-radius tee might not. Check the cable manufacturer's minimum bend radius against the 24 inches before you commit.

Allow for 33 inches of length on the fitting itself, with a 12 inch tray width and 6 inch rail height. On a 24 inch radius horizontal tee the branch sweeps out well past the main run, so rough in the ceiling or rack space around that 33 inch dimension plus the branch projection before you cut your straight sections.

The 6A-12-HT24 tee is UL Classified. Beyond that classification nothing further is stated for this fitting, so if your design relies on the tray itself as an equipment grounding conductor, size and verify that against the manufacturer's published classification data for the Series 2-5 aluminum system before you specify it.

Aluminum is what this tee is made of, and it is the usual pick where weight and corrosion resistance drive the job: lighter to hang on long spans and it holds up in damp or washdown areas without galvanizing. Steel tray is the alternative where you need higher load capacity per span or the spec calls it out. You cannot mix them arbitrarily in a run, so match the fitting material to the straight sections you already have.

Order it as B-Line (Eaton) 6A-12-HT24. Read as a B-Line part code that is the 6 inch aluminum Series 2-5 profile, 12 inch width, horizontal tee, 24 inch radius. If your run is a different width or you need a shorter radius, the number changes accordingly, so match the width and radius digits to your drawing.

Only the tee itself is covered by this part number. Splice plates, connection hardware, and any hold-down clamps or supports at the fitting are separate B-Line items ordered to match the Series 2-5 aluminum 6 inch profile. Count the connection points on a tee (three) and order splice sets accordingly.

It weighs 26 lb. That is a one-hand lift off the ground but an awkward two-man set overhead, because a 24 inch radius tee is a wide, three-legged piece that wants to twist while you are getting splice plates started. Plan a second set of hands and support both the main run and the branch before you tighten anything.