I think different tolerances are used for different materials. For some things (eg industrial glass) millimeter tolerance in Europe[1] matches 1/32nd tolerance

I think different tolerances are used for different materials. For some things (eg industrial glass) millimeter tolerance in Europe[1] matches 1/32nd tolerance which is what is used in the US[2] [1] for example https://www.glastroesch.com/fileadmin/user_upload/Service/Fachwissen/Toleranzhandbuch/Sanco_Toleranzenhandbuch_EN_02_2022.pdf https://www.glastroesch.com/fileadmin/user_upload/Service/Fa... [2] for example https://a3glassfabricator.com/wp-content/uploads/2020/05/tolerance-standards-new-2020.pdf https://a3glassfabricator.com/wp-content/uploads/2020/05/tol...