M4i Star-Hub top-mount height measurings

Reference point for the measurement is the bottom layer of the PCB. That's in the picture the lowermost part of the PCB, not including any soldered components on the back side.

In case of space restrictions the mounting can be done 3 mm lower if a constant and heavy airstream can be guaranteed by the customer.

The position of the star-hub (blue) is measured from the front-plate. A 3rd short card (168 mm) would fit in the adjacent slot.