Why is it called Tap Bit / Tap Hole? That means there is an adjective word “Tap” preceded.
I have always used the term "tap drill" or "tap drill size".
I guess it could be a regional/language difference - but in the end, all means the same thing.
Geometry might be the best way to explain rather than mere words.
Why do I suspect that you are asking this question about a specific reference and then not citing the source reference.
Is this a general question, or do you have a specific source of information that has confused the issue?
Tap bit/ and or drill is the size diameter hole required for the forming of the threads prior to the tapping operation being performed. Hence you get a tap drill/ then a tapped hole.
Different taps, different materials require different size tap drills.
What make the different saying Bit / Hole and saying Tap Bit / Tap Hole?
"Tap" means the hole is threaded to take a screw or bolt directly, without needing a nut.
What I want to know whether there is any specific information carried saying Tap Bit / Tap Hole.
In YouTube sometimes "Tap" word is used other time not used.
From your view, it seems “TAP” is a redundant word.
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