Having spent 25 years of my career at NIST I have learned to appreciate the various standards of the world. DIN, JIS, and ISO all have metric fastener standards and they are all different ;-) And the US manufacturers pick and choose what they like from all three ;-)
In all fairness the United States ANSI standard for inch fasteners isn't any better. We had American National which was replaced by Unified but we still have some AN floating around in little tucked away corners. And of course there are UN and UNR thread forms and 3 classes of fit. Not to forget at least 5 different pipe thread profiles.....
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