I don't agree Brian.
All my 1/2" fittings are 1/4" NPT Thread yet the internal diameter is well over 1/4".
Issues such as this are always dificult to convey what you mean, as often its up to the reader as to the exact meaning.
My barbs are usually referred to (By the vendors) as 1/4" NPT thread to 1/2" barb.
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