List of Drill Bit and Tap Sizes - Drill Size Chart and Tap ...
2020-12-17 · FORMULA FOR TAP/DRILL SIZES (METRIC) Figures in table show amount to subtract from O.D. of screw to obtain specific percentages of thread. Select nearest size commercial stock drill. METHOD 1: Drilled Hole Size (mm) = Basic Major Dia. Of Thread (mm) - *Use whole numbers for % of thread…for 65%, use 65 (not .65). METHOD 2:
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