Raspberry Pi Adapter for Raspberry Pi 3, 4, or Zero.
Recommend mounting with all 4 standoffs if the USB, ethernet, or HDMI connectors are used. 2 standoffs are fine if there are just connections to other modules mounted to a module backplane (therefor little stress on the connections and boards).
If you are using plugable jumper wires into the headers on the Raspberry Pi to other modules the solid physical mounting of all the components ensures that the connections are not stressed and are more reliable. This also makes it easy to show your prototype to others or try it out in the field.
Module size: 4.5"x2.5" nominal (4.4"x2.4" actual).
Mounting holes: 4x #4 screw holes (0.116") on 0.5" grid. 4"x2"
Contents: module PCB with all hardware to mount a Raspberry Pi included (M2.5x0.45 sized - 4x standoffs 6mm Aluminum, 8x screws. updated since some of the pictures), no #4-40 hardware included to mount the adapter to module backplanes.