this post was submitted on 23 Mar 2025
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The auto industry, mostly. Asian and European cars are metric, and imported into America in large numbers, and even domestic manufacturers have been going to metric fasteners in a lot of cases. The oil drain plug on my S10 is 14mm, for example.
I bet if you took a look at common lumber sizes you'd see they're given in millimeters, but weird millimeters. Like why 19mm instead of 20? Because 19mm is very close to 3/4".
I'm not sure about the rest of the world, but automotive wheel and tire sizes in the US are my second favorite mixed measurement. A tire's size is given in rim width in millimeters bead to bead, sidewall height as a percentage of said width, and rim diameter in inches. A 275/75R-15 fits a 275mm wide, 15 inch diameter wheel and is 206.25mm tall bead to tread.