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See Chinese contents: GB/T 17851-2022 GB/T 17851-2022: Geometrical product specifications (GPS) - Geometrical tolerancing - Datums and datum systems
This document specifies the terminology, rules and methods related to the marking and understanding of datums and datum systems in product technical documentation. This document also provides corresponding explanations of the concepts involved to facilitate understanding. This document defines a set of normative operations for establishing datums and datum systems (see GB/T 24637.2). Its inspection operation set (see GB/T 24637.2) can take different forms (physical simulation or mathematical association); however, this is not the content discussed in this document. Note: GB/T 16671 gives detailed rules on the maximum material requirements and minimum material requirements of the datum. This document applies to product geometric technical specifications related to datums and datum systems.
