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.
Basic Data
Standard ID
GB/T 17851-2022 (GB/T17851-2022)
Description (Translated English)
Geometrical product specifications (GPS) - Geometrical tolerancing - Datums and datum systems
Sector / Industry
National Standard (Recommended)
Classification of Chinese Standard
J04
Classification of International Standard
01.100.20; 17.040.10
Word Count Estimation
78,784
Date of Issue
2022-12-30
Date of Implementation
2023-04-01
Older Standard (superseded by this standard)
GB/T 17851-2010
Issuing agency(ies)
State Administration for Market Regulation, China National Standardization Administration
