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The easiest way to get the correct drill diameter size for your tap hole: 

Minus the tap pitch from the overall diameter of the tap.

For example Metric course 5mm tap with a 0.8mm pitch = Drill diameter of 4.2mm

Where there is a 0.01mm pitch variation (eg 12mm x 1.75mm Metric Course) go to the next closest drill diameter greater than the pitch.

For example  Metric course 12mm tap with a 1.75mm pitch = Drill diameter of 10.2mm

Otherwise you can download our tap conversion chart HERE