B-Line Eaton series imperial cable tray and ladder, 4" Height, 18" Length, 6" Width, Series 2-5 horizontal tee, Aluminum, 12" Radius

It's the branch fitting for an Eaton B-Line Series 2-5 aluminum cable tray run: a horizontal tee splits a straight run into a third leg in the same horizontal plane, so you can feed a branch off the main without breaking the tray into field-cut pieces. The 4A-06-HT12 is built for 4 inch deep, 6 inch wide tray and turns on a 12 inch radius.

Plan for the fitting's 18 inch length along the run, with a 12 inch inside bend radius through the turn. That radius is what sets your minimum clearance on the branch side, and it's also the bend radius your conductors get through the fitting, which matters if you're pulling large power cable with a manufacturer minimum bend radius.

No. A horizontal tee branches in the flat plane only. If the branch drops or rises, you need a vertical elbow or a vertical tee, not the 4A-06-HT12. Mixing the two is the most common fitting mis-order on a tray package: walk the routing and mark each turn as horizontal or vertical before you build the fitting list.

Radius is a cable question before it's a space question. A 12 inch radius fitting like the 4A-06-HT12 gives conductors a gentler sweep through the branch, which is what you want on larger power or fiber runs with a stated minimum bend radius. A smaller radius fitting saves ceiling space and is normal on control and instrumentation tray where the cable bends tighter. If your cable spec calls for more than 12 inches, step up to a larger radius fitting in the same series rather than forcing it.

Aluminum. That's the usual pick for damp, coastal, wash-down, and chemical-exposure areas because it won't rust the way painted or plain steel tray does, and it keeps the fitting light: this one is 11.902 lb, which is a one-person lift on a lift or ladder. It also means you're bonding an aluminum tray system, so use fittings and grounding hardware rated for aluminum.

Yes, it carries CSA certification. That's the one to quote on Canadian jobs and on specs that call for CSA-certified cable tray components.

Order your splice connections separately. The 4A-06-HT12 is the tee fitting itself; every joint where it meets straight tray needs splice plates and bolts sized for Series 2-5 aluminum tray, and you'll need two per side at each of the three connection points. Count your splices off the drawing before the order goes in, because a missing splice plate stops the run on install day.

Eaton B-Line catalog number 4A-06-HT12. Read it as the series and depth (4A, 4 inch aluminum), the tray width (06), the fitting (HT, horizontal tee), and the radius (12 inches). If you need a different width or radius, those two digit groups are what change.