Pre-Hole Chart

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Proper pre-holes are required prior to tapping. Failure to follow the guidelines in these charts could result in serious damage to your tool.

Select the measuring system you wish to view

All styles NCT3:

UN Threads / American Hole Sizing

Metric Thread / American Hole Sizing

Metric Thread / Metric Hole Sizing

NCT3.5:

UN Threads

Metric Threads

 

 

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Copyright © 2002 d/k technologies
Last modified: March 25, 2007