Pre-Hole Charts

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 TT2″
UN Threads/American Hole Sizing
Metric Thread/American Hole Sizing
Metric Thread/Metric Hole Sizing

UN Threads
Metric Threads

MD Technology offers the latest technology for automating your tapping applications.

MD Technology BBB Business Review