Machinist Calculator has been developed to quickly solve common machine shop math problems such as trigonometry, speeds and feeds, bolt circles, and much more. Get your free demo now.

Tapping Drill Charts


This application will enable the user to quickly choose tapping drills.

Click the top down arrow to choose the thread type. Unified inch, ISO metric, taper pipe threads are available. Click the other down arrow and use the drill chart to find the size needed. Click on the line to enter it into the diameter window.

This application opens ready to use the measuring system last used. If the metric system was used last, you'll be prompted to change to "Inch" for inch threads and vice versa. You may also use the "Inch" and "Metric" options to convert values shown between Inch and Metric measurements.


Tapping drill size chart in speed feed calculator Download free Machinist's Calculator demo.

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