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Divide metric tapping drill bit size by 25.4 to convert to fractional drill bit diameters


Divide the metric tapping drill bit size on the above chart by 25.4 to convert to the CLOSEST fractional drill bit size instead.



Web 2.0 scientific calculator

Click image below for detailed thread diameters & pitches

 


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This chart informs you which drill bit and tap to use for the respective keensert/keysert you wish to install into a damaged threaded hole.





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