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Turning tool holder nomenclature – ISO names

Written By Dasarathi G V

|

November 10, 2025

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ISO turning tool holder nomenclature – simplified

Turning tool holder nomenclature follows an ISO standard. If you are working on a CNC shop floor with lathes, knowing this is a must. The name looks complicated, but is actually very easy to interpret.

When selecting a holder, there are in fact only 4 parameters that you really need to understand to select the right holder for your application. These are the numbers marked in red in the above example. The others are automatically decided or require minimal effort to decide. In the table below, you have to use your brain only in selecting the parameters where there is a brain in the row.

This is all there is to turning tool holder nomenclature. Simple !

More (actually prior) reading Positive, Negative inserts.

Pics. and Text source: CADEM NCyclopedia multimedia CNC training software.

Author

Dasarathi G V

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Dasarathi has extensive experience in CNC programming, tooling, and managing shop floors. His expertise extends to the architecture, testing, and support of CAD/CAM, DNC, and Industry 4.0 systems.

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