ISO 12781-1:2011 is an international standard that defines terms and parameters related to flatness. It's a geometrical product specification (GPS) standard.
ISO 12781-1:2011 Geometrical product specifications (GPS) — FlatnessPart 1: Vocabulary and parameters of flatness. Published (Edition 1, 2011) This publication was last reviewed and confirmed in 2021. Therefore this version remains current.
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