B-Line Eaton series imperial cable tray and ladder, 4" Height, 48.0625" Length, 18" Width, Series 2-5 horizontal bend, Aluminum, 90° Angle, 36" Radius

Yes, that is exactly the run it is built for. The 4A-18-90HB36 is an Eaton B-Line Series 2-5 horizontal bend with an 18 inch tray width and a 4 inch side rail height, in aluminum. It turns the run 90 degrees on a 36 inch radius. Match the width, the rail height, and the material to the straight sections on either side of it or the splice plates will not line up.

Plan the corner around the fitting's overall length of 48-1/16 inches. The 36 inch radius is measured to the inside of the turn, and with an 18 inch tray width the fitting sweeps well past that, so a 36 inch radius bend is not something you squeeze into a tight corner against a wall. Set your supports on each leg of the turn before you drop the bend in.

Order Eaton B-Line 4A-18-90HB36. The number decodes the way the fitting is built: 4A is the 4 inch aluminum series, 18 is the tray width, and 90HB36 is a 90 degree horizontal bend on a 36 inch radius. Horizontal means the turn is in the flat plane, left or right; if you need to change elevation you want a vertical inside or outside bend instead.

Bend radius is driven by the cable, not the tray. Large power conductors and fiber have a minimum bending radius, and a 36 inch radius fitting like the 4A-18-90HB36 gives the cable a gentle sweep through the 90 degree turn so you are not fighting the jacket or exceeding the cable manufacturer's bend limit. Tighter radius fittings save space but are only appropriate where the cable in the tray can take the turn.

It is aluminum. That matters on two fronts: aluminum holds up in wet and mildly corrosive environments without a galvanized coating to scratch through, and it keeps the fitting light. This one weighs 17.581 lb, so a single installer can handle it on a lift. If your run is steel tray, order a steel bend instead so the bonding and the splice hardware match.

The 4A-18-90HB36 is supplied as the bend fitting itself. Splice plates, hardware, hold-down clamps and supports are separate line items on a cable tray job, so add them to the order along with the straight sections you are tying into. Count two splice connections per fitting, one at each end of the turn.

No. This is a horizontal bend, meaning it turns the run left or right while the tray stays in the same plane it was installed in. A run turning up or over an obstruction needs a vertical inside or outside bend. Using a horizontal fitting for an elevation change twists the side rails and the splices will not seat.