Usually 1.6mm , though it can range from 0.5mm to 3.0mm depending on the application.
Because this marking is a generic manufacturing label, a specific "install schematic" for just "APCB M3 94V-0" does not exist. You must search for the schematic based on the (e.g., NVIDIA GeForce 310) or the Assembly/Part Number apcb m3 94v0 schematic install
Your schematic shows a dual-diode configuration (D13 & D14) near the transformer. On the board, they look identical. Without the schematic, you might install both the same way. With the schematic, you see D13 is a UF4007 (fast recovery) and D14 is a 1N4007 (standard). Swapping them causes overheating. Usually 1
Here is a guide to understanding what this board is, how to find its schematic, and the steps for a successful installation or repair. What is the APCB M3 94V-0 The " 94V-0 Go to product viewer dialog for this item. On the board, they look identical