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Tap Drill Size

Calculate Tap Drill Size for Tapping Applications.

These calculations are based upon theoretical values and are only intended for planning purposes. Actual results will vary. No responsibility from Kennametal is assumed.

Cutting Tap Parameters
Metric
Inch

Cutting Tap Parameters

in mm
Enter desired % or leave blank if you do not know. Cutting Taps 68% to 70% recommended
%
Resulting Hole Size

Resulting Hole Size

in.
Forming Tap Parameters

Forming Tap Parameters

in mm
Enter desired % or leave blank if you do not know. Cutting Taps 68% to 70% recommended
%
Resulting Hole Size

Resulting Hole Size

in.
Calculate Major Diameter For Tap Drill Size

Calculate Major Diameter For Tap Drill Size

in mm
Results

Results

in

Suggested Percentages of Full Thread in Tapped Holes

A common internal thread, drilled so that it results in 50% of full thread will break the external thread, before the internal thread will strip. A common internal thread drilled out so that it contains 100% of full thread is only 5% stronger than a 75% height of thread, yet it requires 3 times the power to tap.

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