I know of nothing and frankly it would likely depend a great deal upon what the connectors or fixtures look like. Some of the old scope probe connectors could be a bit bulky at the front panel.
In any event consider setting your own standard. 19mm might be a bit tight but it does create some compatibility with banana jacks. From a human factors standpoint though I wold suspect an ideal pitch would be far wider. I don't have any measurement devices handy at the moment but I would suggest gripping a standard BNC connector between thumb and fore finger, the thickest way possible and adding about 5 mm to that dimension. My best guess would be that it puts you at least 45 mm.
However if we go back to the 19mm-3/4" "standard", consider that as useful pitch to remain compatible with. You then have spacing possibilities of:
This would be for a 1D array. 2D arrays (multiple columns and rows) are another thing as it becomes very difficult access such connectors without tools. So from my perspective you need to decide if tool free access is important. I would say it is very important.
The reason I say tool free access is important is due to a different type of hardware, which is M12 connectors used in automation. Some manufactures pack these connectors on extremely tight pitches that literally require you to disconnect connectors from the outside it to get to the I/O point you need to access. Extremely frustrating to say the least. So on a 2D layout you really need to be able to get your fingers in there to unlatch the connector. Note also that on a 1D array this can also be an issue if you don't have finger clearance above and below the connectors.
As for banana connector compatibility that can be very useful as it is pretty common to convert from one to another (BNC). Well in low frequency cases anyways. If banana plugs have no future in a specific instrument then your only reason to go with a standard banana pitch is hard tooling for a common chassis.
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