Standard Hole Tool Series

Hole Size and Fit options are determined by which Series you choose.

The examples below show the difference between ISO and UNC. Notice the change in Size nomenclature and Fit options. ISO has Fit options of Nominal, Close, Medium, and Free.

Fit is disabled in UNC.

Within each Series, the Size you choose determines the hole diameter
You can enter a different diameter and it will be shown in Bold to indicate that it is non-standard

Note: In legacy models, Standard Holes created using the NPS series are not recognized, since NPS has been replaced with the NPSM series.