Tap Drill or Core Hole Sizes for Cold Form Tapping ISO Metric Threads.
Form tap drill sizes series#
* Values are calculated for Length of engagement of 5xPitch. British Standard Tapping Drill Sizes for ISO Metric Coarse Pitch Series Threads BS. Tap Drill Sizes For Forming Taps Tap Drill Sizes For Forming Taps. * Permisable values for thread Class 3A # Description Value (Inch) Value (mm) es Allowance 0 (Ref) 0 (Ref) d Major Diameter 0.0819 - 0.086 2.08 - 2.184 d 2 Pitch Diameter 0.0728 - 0.0744 1.849 - 1.89 d 3 Minor Diameter To get the tap drill size in other depths, use our Tap Drill Size Calculator.
You can learn more about thread depth in tapping here. For calculations of different engagement length use the Thread Calculator If not specified, assume a thread depth of 75. * Values are calculated for Length of engagement of 5xPitch.
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