One questions we are often asked is what is the difference between the ED5200, ED5200A and ED4200 Latch Assembly or Active Head. The ED4200 is for the Narrow Stile Rim Devices, usually mounted on aluminum framed glass doors. The ED5200 is for standard exit doors, where the ED5200A is for interior Fire Doors (no cylinder or hex key dogging). The ED4200 will have a narrow center case cover, usually less than 1-3/4″ wide. The ED5200 and ED5200A have a wider cover usually about 3 inches wide. In the diagram below I show the hub location for the ED5200, ED5200A and ED4200:
Corbin Russwin 650F35-8 ED5200 Active Head
Corbin Russwin 650F36-8 ED5200A Active Head
Corbin Russwin 650F37-8 ED4200 Active Head
As you can see the Cylinder Hub on the ED4200 is on the center line of the mounting screws. The Cylinder head on the ED5200 and ED5200A have an offset mount.