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Tap Drill Size Calculator For Kennametal Holemaking Application

For Cutting Taps

Cutting Tap Parameters
inch Help Calculate Major Diameter
% Help
Resulting hole size
in. Help
mm Help

For Forming Taps

Forming Tap Parameters
inch Help Calculate Major Diameter
% Help
Resulting hole size
in. Help
mm Help

Major diameter

Calculate major diameter for Tap Drill Size
  inch Help
in. mm
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

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

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