1 reply to this topic

[srtools1980y]

hi! wat is the thumb rule for tap drill size, metric threads? is it od-pitch?

[JEBradley]

You should be able to find tap drill charts and tables from various internet sites

e.g. http://sosnick.uchic...drill_size.html

I don't think there's any need to use a 'rule of thumb' per se.

I wonder if i'm maybe not reading your question correctly - if I havent provided an answer then please post again with details about what your specific question is.