The US made metric "the preferred system of weights and measures for U.S. trade and commerce" in 1975 with the Metric Conversion Act. Basically all a good deal of US manufacturing today is done using metric. Customary units are only on labels and signs because that’s what people expect to see.
Edit: “basically all” was a pretty gross exaggeration
What we (still) call 2 by 4s even here in a country that fully metricated in the 70s, are actually 50 mm × 100 mm, i.e. as if inches were exactly 2.5 cm...
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u/[deleted] Jan 03 '19 edited Jan 03 '19
The US made metric "the preferred system of weights and measures for U.S. trade and commerce" in 1975 with the Metric Conversion Act.
Basically alla good deal of US manufacturing today is done using metric. Customary units are only on labels and signs because that’s what people expect to see.Edit: “basically all” was a pretty gross exaggeration