Electronic – PCB Connector Footprint – Through Hole Diameter – IPC Standard and Datasheet Specification

Those are barrel power connectors.

Looking at Digikey, it looks like common inner diameters with a 5.5mm outer diameter are 2mm, 2.1mm, and 2.5mm, but that doesn't mean that your target application doesn't have a custom size which doesn't match any of these.

The one I usually use for my projects is 2.1mm*5.5mm if I can, but as far as I know this is by no means a rule of thumb.

Knowing what the jack is being used for may help in identifying a correct size.

I don't think you should depend on the holes to locate the part when tolerances are important. I agree with your 10-15 mils as I said earlier here (in metric 0.25 to 0.4mm).

Instead, make up a jig to hold the parts in the proper location while they are being soldered. It can be fancy for wave soldering or something simple that holds the parts while being hand soldered (perhaps fashioned from the mating part such as the punched chassis).

Round pins are a particular hassle if you call it too close- at least with square or rectangular pins you can skive off some plating inside the holes at the corners of the pin and still force the pin in. If you insist on the using the holes... um, maybe make the peg round and the hole square.. (call out slot-drilled square holes in the PCB).