Posted by gavin compton on 11/01/2016 21:21:16:
just to double check the "core Dia" is one used for dies ?
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Gav,
Core diameter is the theoretical diameter at the root of a full depth male thread [and will be pretty much what the die cuts]. … Tapping drill, as you will see, is usually a little larger, because there is no need for 100% engagement.
MichaelG.