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Spud, it's not that simple. Both ends of the triangular profile are beveled, and the nominal diameter of the thread is not measured at the tips of the triangles (Dmaj+H/8), but the actual height of the external thread (Dmaj), so the math is a bit more complex. The drill diameter is Dmin here.
More info on wikipedia, as always: http://en.wikipedia.org/wiki/ISO_metric_screw_thread
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