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AlfonsoR,
I just went out and checked the taps I have and some are made by Craftsman with an ASME stamp on them. Who knows who the actual manufacturer is as lots of companies make things for Sears. I would assume that since there is an ASME stamp on them they would be made to that standard.
I also get some taps from a local machinist supply house and, although I can't find a manufacturers I.D., they do have ASME stamped next to the size mark. I really don't know why you could tap a hole with a certain tap and then not be able to go back into that hole with the same tap and get the same results; it's a mystery. All I can say for sure is that a threading tap will open up the threads and will result in a loose fit.
I'm going to ask Arron Burnham why this is and get back to you all.
Lindy
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