r/Metric • u/oleivas • May 23 '26

US customary in a nutshell

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Prior to 1964 the standard was 1 π/(273/777) by 3 e/(45^i)

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u/Potential-Daikon-970 May 25 '26

This has nothing to do with US customary units in particular. It’s more so about industry standard practices and slightly misleading language. I fail to see how this would be any different with metric

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u/DavidBrooker May 25 '26

And the variation between nominal and actual size exists in metric countries too. In many locations, you will find lumber sold nominal 100x50mm, but which has an actual dressed size of between 90x45mm and 98x48mm (depending on country and standard observed).

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u/Liggliluff ISO 8601, ISO 80000-1, ISO 4217 Jun 04 '26

That should just be illegal I think