04MJ-04MAORB 90 DEG Elbow

Correct on the sizing. Both ports are 7/16-20, but the thread types are different by design. One end is a male JIC SAE 37-degree flare, and the other is a male SAE adjustable O-ring boss. Same thread pitch and diameter, different sealing methods. The JIC end seals on the flare angle, while the O-ring boss end uses the NBR O-ring that comes with the fitting. That combination is exactly the point of this elbow, letting you transition between those two connection styles at a 90-degree angle without needing an adapter stack.

Thread B1 on this fitting is a male JIC SAE 37 degree flare in 7/16-20, built to SAE J514. If your hose end is a matching 7/16-20 JIC female flare, that side is the correct style and thread size to pair up.

It is indeed made from steel forging, so it should hold up well in industrial settings.