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You might want to specify the brand you get those measurements from. Most of us have been using 3/4″ conduit that measures 23.5mm OD. I have checked three brands I know wheatland is one of them.
Those numbers might be for rigid conduit which is not what we use. We use either EMT conduit (Sold by ID) or stainless steel tubes (sold by OD).
As for the stainless I recommend the .049″ thickness. http://www.vicious1.com/forum/topic/stainless-steel-quick-and-dirty-flex-test/