US Engineers and Scientists went metric several decades ago, actually. So did the medical profession.

For example, all Surface Mount electronics components are metric measurement.

Under the hood of most American cars one can find both metric and SAE bolts and nuts. Depends upon the part and also to some extent where that part was designed and/or built.

Due to the proliferation of Inch Pattern, though, most US Engineers also have to deal with conversions from one to the other, for example, the metric printed circuit board fitted into the inch pattern case, things like that. We also are well versed in the problem of "metric creep" where the simple mathematical conversion from inch to metric or vice verse will always leave things a little bit "off".

Myself, I place the argument, if any, in the same category as Mac vs PC wars. Some folks divide into camps and that's that, it becomes yet another religious war in many ways. Others, like myself, simply do the pragmatic thing and learn to use both.

At the end of the day they are only tools.

It has been said that it is a poor carpenter who blames his tools.


--Mac