List of Drill Bit and Tap Sizes - Drill Size Chart and Tap ...
2020-12-17 · Drilled Hole Size (mm) = Basic Major Dia. Of Thread (mm) - *Use whole numbers for % of thread…for 65%, use 65 (not .65). METHOD 2: Nominal O.D. - (Dbl. Thread Depth X % of Full Thread) = Drilled Hole Size EXAMPLE: To find the hole size for obtaining 75% of thread in a (M6) 6mm x 1.00 tapped hole, follow first column down to 1.00
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