PCB Via sizes suggested to avoid surprises

Preset Finish Drill Sizes - Dimensisons in inches; for mm multiply by 25.4
Suggested hole sizes are for finished hole after plating through.

Suggested Hole hole size: Tolerance: Suggested Minimum Copper Pad Dimensions: Suggested Minimum Copper Inner Layer Clearances:
0.008 § .006/-.008 0.0250 0.0330
0.016 +0.002/- 0.006 0.0310 0.0410
0.0200 +/- 0.004 0.0370 0.0450
0.0250 +/- 0.004 0.0420 0.0500
0.0290 +/- 0.004 0.0460 0.0540
0.0330 +/- 0.004 0.0500 0.0580
0.0360 +/- 0.004 0.0530 0.0610
0.0405 +/- 0.004 0.0575 0.0655
0.0432 +/- 0.004 0.0602 0.0682
0.0460 +/- 0.004 0.0630 0.0710
0.0535 +/- 0.004 0.0705 0.0785
0.0610 +/- 0.004 0.0780 0.0860
0.0670 +/- 0.004 0.0840 0.0920
0.0800 +/- 0.004 0.0970 0.1050
0.0875 +/- 0.004 0.1045 0.1125
0.0935 +/- 0.004 0.1105 0.1185
0.1005 +/- 0.004 0.1175 0.1255
0.1100 +/- 0.004 0.1270 0.1350
0.1259 +/- 0.004 0.1429 0.1509
0.1410 +/- 0.004 0.1580 0.1660
0.1510 +/- 0.004 0.1680 0.1760
0.1670 +/- 0.004 0.1840 0.1920
0.1930 +/- 0.004 0.2100 0.2180
0.2510 +/- 0.004 0.2680 0.2760

§ Not recommended for boards with high layer count for cost reasons, but may be necessary to access high density BGA pins.

These hole sizes are recommended becauses they are industry standard clearance sizes for typical through-hole component leads or for screws.