I wouldn't have any idea. nor to I even care
What I do know is once a part came in for repair the internal threads looked like 16mm2.00 pitch but turned out to be 5/8ths 12 TPI instead. A 16 mm tap would only go in a short distance before trying to cut new threads. I wouldn't have thought anything about that had all of the threads needed cleaning up after removing a broken fastener from the holes. but 3 of the holes were pristine and clean. and the new fasteners were proprietary in shape I ordered the proper 5/8-12 tap.
As TM51 once said who knew 12 was an odd number

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