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If you ABSOLUTELY MUST - Pitch diameter of threaded holes CAN be obtained using flexbar reprorubber and casting it. Can be dificult to remove if not released properly ar if you don't add a key handle to help. But, as a rule I do not put MMC on threaded holes. Way to expensive to measure and the bonus values are so low. No return on investment.
I believe if it is not specified, pitch diameter is used.
In practice, if it is minor diameter (for internal) you will need to gage the diameter with something other than the CMM (gage pin?).
I actually never apply MMC to threaded holes. If it is in tolerance without adding the MMC bonus, great. If not, I note that it is not possible to measure the diameter (it's always pitch diameter here) so it is not possible to report if it is in tolerance.
By 'not possible' I mean that it is not possible for me to measure it with the tools I have at my disposal. Obviously, it is possible for someone, somewhere, with better tools.
I once found the tolerances for threads, to apply MMC is almost a moot point. Look at it this way, if they were that concerned about location, they probably wouldn't be using a screw or bolt to locate it. It just goes back to some Engineers not having a frickin clue. I ignore MMC on a thread period. If you take a screw and thread it in, can it wiggle to the left or right ? NO, its self centering. I can't believe we even need to have these discussions because of the lack of understanding by the people making the drawings, it disgusts me.
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