GB/T 4249-2018_English: PDF (GB/T4249-2018)
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Standard ID | GB/T 4249-2018 (GB/T4249-2018) | Description (Translated English) | Geometrical product specifications (GPS) -- Fundamentals -- Concepts, principles and rules | Sector / Industry | National Standard (Recommended) | Classification of Chinese Standard | J04 | Classification of International Standard | 01.100.20 | Word Count Estimation | 14,134 | Date of Issue | 2018-09-17 | Date of Implementation | 2019-04-01 | Older Standard (superseded by this standard) | GB/T 4249-2009 | Drafting Organization | China Machine Productivity Promotion Center, Zhengzhou University, Omnex (Shanghai) Consulting Co., Ltd., China Aviation Integrated Technology Research Institute, Pan Asia Automotive Technology Center Co., Ltd., Zhejiang University, Carl Zeiss (Shanghai) Management Co., Ltd., Hexagon Measurement Technology (Qingdao) Co., Ltd., Shanghai Automotive Group Co., Ltd. Technology Center, Beijing Automobile Co., Ltd., Qiaozhi Automobile Co., Ltd., Xi'an Jiaotong University, SAIC-GM-Wuling Automobile Co., Ltd., Dalian Institute of Technology | Administrative Organization | National Product Geometric Technical Standardization Technical Committee (SAC/TC 240) | Proposing organization | National Product Geometric Technical Standardization Technical Committee (SAC/TC 240) | Issuing agency(ies) | State Administration of Markets and China National Standardization Administration | Standard ID | GB/T 4249-2009 (GB/T4249-2009) | Description (Translated English) | Geometrical product specifications (GPS). Tolerancing principle | Sector / Industry | National Standard (Recommended) | Classification of Chinese Standard | J04 | Classification of International Standard | 01.100.20; 17.040.10 | Word Count Estimation | 10,179 | Date of Issue | 2009-03-16 | Date of Implementation | 2009-11-01 | Older Standard (superseded by this standard) | GB/T 4249-1996 | Quoted Standard | GB/T 1800.1-2009; GB/T 1182-2008; GB/T 16671-2009; GB/T 18780.1-2002; GB/T 18780.2-2003; GB/Z 20308-2006 | Adopted Standard | ISO 8015-1985 | Drafting Organization | Productivity Promotion Center in the machine | Administrative Organization | National product size and geometry Technology Standardization Technical Committee Specification | Regulation (derived from) | National Standard Approval Announcement 2009 No.2 (Total No.142) | Proposing organization | National product dimensions and specifications Technology Standardization Technical Committee | Issuing agency(ies) | Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China; Standardization Administration of China | Summary | This standard specifies the principles to determine the size (linear and angular dimensions) the relationship between tolerance and geometrical tolerances. This standard applies to technical drawings and related documents in the marked size, dimensional tolerances and geometric tolerances to determine the size of parts elements, orientation and position of features, shape. | Standard ID | GB/T 4249-1996 (GB/T4249-1996) | Description (Translated English) | Tolerancing principle | Sector / Industry | National Standard (Recommended) | Classification of Chinese Standard | J04 | Classification of International Standard | 17.040.10 | Word Count Estimation | 8,898 | Date of Issue | 1996/12/18 | Date of Implementation | 1997/7/1 | Older Standard (superseded by this standard) | GB 4249-1984 | Quoted Standard | GB/T 1182-1996; GB/T 16671-1996, | Adopted Standard | ISO 8015-1985, MOD | Regulation (derived from) | Announcement of Newly Approved National Standards 2009 No. (No. 142 overall) 2 | Proposing organization | Ministry of Machinery Industry of the People Republic of China | Issuing agency(ies) | State Bureau of Technical Supervision |
GB/T 4249-2018
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 01.100.20
J 04
Replacing GB/T 4249-2009
Geometrical product specifications (GPS) -
Fundamentals - Concepts, principles and rules
(ISO 8015:2011, MOD)
ISSUED ON: SEPTEMBER 17, 2018
IMPLEMENTED ON: APRIL 01, 2019
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 5
4 Basic assumptions for reading specification on drawing ... 6
5 Basic principles ... 7
6 Marking rules for default specification operator ... 12
7 Marking rules for specific specification operator ... 14
8 Rules described in brackets ... 16
Annex A (informative) Positions in GPS matrix model ... 17
Bibliography ... 19
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard replaces GB/T 4249-2009 “Geometrical product specifications
(GPS) - Tolerancing principle”. Compared with GB/T 4249-2009, the main
technical changes in this Standard are as follows:
-- deleted, added some terms and definitions (see Clause 3 of this Edition,
Clause 3 of Edition 2009);
-- moved the content of “Independent principle” to the clause of
“Fundamental principle” (see 5.5 of this Edition, Clause 4 of Edition 2009);
-- deleted tolerance (see Clause 5 of Edition 2009);
-- deleted relevant requirements (Clause 6 of Edition 2009);
-- deleted drawing marks of tolerance principle (Clause 7 of Edition 2009);
-- added basic assumptions for reading specification on drawing (see Clause
4 of this Edition);
-- added basic principle (see Clause 5 of this Edition);
-- added marking rules for default specification operator (see Clause 6 of this
Edition);
-- added marking rules for specific default specification operator (see Clause
7 of this Edition);
-- added rules for expression in brackets (see Clause 8 of this Edition).
This Standard uses redrafting method to modify and adopt ISO 8015:2011
“Geometrical product specifications (GPS) -- Fundamentals -- Concepts,
principles and rules”.
Compared with ISO 8015:2011, there are technical differences in this Standard.
The terms involved in these differences have been marked by a vertical single
line (-) at the margin of the outer margin. The corresponding technical
differences and reasons are as follows:
-- for normative references, this Standard made adjustment for specific
technical differences, so as to adapt to the technical conditions of China.
See Clause 2 “Normative references” for the adjustment. The specific
adjustments are as follows:
• used GB/Z 24637.1 that identically adopts International standard to
Geometrical product specifications (GPS) -
Fundamentals - Concepts, principles and rules
1 Scope
This Standard specifies the fundamental concepts, principles and rules that are
valid for the creation, interpretation and application of all relevant standards,
technical specifications and technical documents to product dimensions,
geometrical product specifications (GPS) and inspections.
This Standard is applicable to the interpretation for GPS marks on all types of
drawings.
“Drawing” referred in this Standard is a broad concept. It includes all documents
that express workpiece specifications.
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
GB/Z 24637.1, Geometrical Product Specifications (GPS) - General
concepts - Part 1: Model for geometrical specification and verification (GB/Z
24637.1-2009, ISO/TS 17450-1:2005, IDT)
GB/Z 24637.2, Geometrical Product Specifications (GPS) - General
concepts - Part 2: Basic tenets, specifications, operators and uncertainties
(GB/Z 24637.2-2009, ISO/TS 17450-2:2002, IDT)
ISO/IEC Guide 98-3:2008, Uncertainty of measurement - Guide to the
expression of uncertainty in measurement (GUM:1995)
ISO/IEC Guide 99:2007, International vocabulary of metrology - Basic and
general concepts and associated terms (VIM)
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/Z
24637.1, GB/Z 24637.2, ISO/IEC Guide 98-3:2008, ISO/IEC Guide 99:2007 as
It is assumed that the interpretation for the tolerance limit is completely same
with the interpretation for the functional limit.
4.4 Functional level of workpiece
It is assumed that the workpiece 100% meets the function within the tolerance
limit; does not meet the function outside the tolerance limit.
5 Basic principles
5.1 Principle for adoption
Once it adopts one part of ISO GPS system in mechanical engineering product
documents, it is equivalent to adopting the entire ISO GPS system, unless
otherwise stated in the document, for example, “refer to other related
documents”.
“Unless otherwise stated in the document” means that if the regional, national
or enterprise standards referred are marked in the document, it shall use those
standards. Do not adopt ISO GPS system to interpret the normative elements
specified in the standard.
If it is unnecessary to adopt ISO GPS system, “noting method is according to
GB/T 4249” may selectively mark within the title bar or near the title bar.
NOTE 1: The most common way to adopt ISO GPS system is to use one or more GPS
specifications in drawing.
NOTE 2: ISO GPS system is an International standard issued by ISO/TC 213, see GB/T
20308.
NOTE 3: “Adopting the entire ISO GPS system” means that unless otherwise specified, if
GPS fundamental standard and GPS comprehensive standard are adopted, then the
reference temperature specified in GB/T 19765-2005 and the rules for determination
specified in GB/T 18779.1 shall be adopted. The purpose of “principle for adoption” is to
provide formal traceability for those GPS standards and rules.
5.2 Principle for hierarchy of GPS standard
ISO GPS system is hierarchical. Its standard variety, according to hierarchy,
contains the following types:
- GPS fundamental standard;
- GPS comprehensive standard;
- GPS general standard;
5.4 Key element principle
One workpiece can be considered to be composed by many key elements that
are limited by natural boundaries. Under the situation of default, each GPS
specification of one key element applies to the entire key element. Each GPS
specification that expresses the relationship between many key elements
applies to many key elements. Each GPS specification is only applicable to one
key element or one relationship between key elements.
If it is necessary to change this default specification, it needs to clearly mark on
the drawing.
NOTE 1: The natural boundaries between key elements usually refer to the boundaries
that sudden change happens on the surface normal. But it is not always true. If one
workpiece is composed of two hemispherical elements that have same diameter and
intermediate cylindrical element, in such case, the surface normal of natural boundaries
between key elements does not have sudden change.
NOTE 2: Some marks do not apply to the entire key element, for example, partial area of
key element is marked with a long thick dotted line or is marked with ACS (any cross
section).
NOTE 3: Some marks apply to many key elements, for example, CZ (combined tolerance
zone) is marked.
NOTE 4: Unless otherwise specified, GPS general specification is considered as a series
of GPS specifications. Each GPS specification is only applicable to one characteristic of
key element or relationship between key elements (see 5.12).
5.5 Independence principle
Under the situation of default, GPS specification of each key element or GPS
specification of relationship between key elements is independent from other
specifications. They shall be met respectively, unless other standards or special
marks are specified in the actual product specification (for example, modifier
symbol ○M in GB/T 16671, CZ in GB/T 1182 and ○E in ISO 14405-1).
5.6 Decimal point principle
The numerical values after the decimal point of nominal size and tolerance
value that are not indicated shall be zero. This principle is applicable to the
drawing and GPS standard.
Example 1: ±0.2 is equivalent to ±0.200000...
Example 2: 2:10 is equivalent to 10.000000...
5.7 Default principle
eliminate any ambiguity of the functional description in the specification.
A complete specification operator defines every important detail to be measured
for the specification. Therefore, it eliminates the ambiguity of the specification.
Inspection of operation is an actual application of specification operator. When
the method uncertainty is zero, inspect the sequences of operator and
specification operator which shall be in one-to-one correspondence. When the
method uncertainty is not zero, there are differences in two operators or the
sequence of two specifications.
Although the inspection operator is not marked in the drawing, it shall get close
to the specification operator during the inspection process, so as to ensure the
method uncertainty within the allowable range.
5.10.2 Description of duality principle
The duality principle points out:
a) the GPS specification operator that is specified by GPS specification is
irrelevant to any measuring procedures or measuring instruments;
b) the inspection operator that is to realize GPS specification operator is
irrelevant to the GPS specification itself; but the relationship between it
and GPS specification operator is mirror correspondence.
GPS specification does not specify which kind of inspection operator is
acceptable. Whether the operator is acceptable or not is inspected by
measuring the uncertainty and specification uncertainty.
5.11 Function control principle
The function of each workpiece is described by function operator. It can be
simulated by a series of specification operators. These specification operators
once again define a series of measuring and relevant tolerances.
When all functional requirements of workpiece have been clearly described and
controlled by GPS specification, such specification is complete. In most cases,
since some functions are described / controlled imperfectly, the specification
might be incomplete. Therefore, the correlation between function and a series
of GPS specifications may be superior or inferior.
Any correlation deficiency between any functional requirements and GPS
specification shall cause the uncertainty of function description.
5.12 General specification principle
For each characteristic that has same type and the relationship between each
When the actual specification of any geometric characteristic in the drawing is
ISO basic GPS specification that is marked according to GB/T 1182, GB/T 131-
2006, GB/T 17851, and when in or near title bar, altered default general GPS
specification is not marked, then ISO default specification operator is required
by a current ISO standard that defines corresponding default specification
operator. When establishing drawing, the ISO standard that specifies
corresponding default specification operator shall be the latest version. If other
earlier versions of ISO standard are required to use, it shall be indicated clearly.
NOTE: At present, ISO GPS standard does not give default provisions on all specification
operations in all specification operators, so some ISO default specification operators are
incomplete.
6.3 Altered default GPS specification
One altered default specification operator shall be defined in relevant document.
As a part of a complete specification operator, altered default specification
operator shall be rigorously, clearly and completely defined.
Altered default specification operator shall be marked in or near title bar of
drawing. When non-ISO GPS standard is applied, it shall at least mark the
following information:
- indicate “marking method” or “marking method is according to GB/T 4249”;
- symbol ;
- complete identifier of relevant document and other necessary information
(such as date of release).
NOTE: AD represents “altered default”.
If altered default specification operator in drawing is more than one, a number
is needed to add after each symbol.
Some ISO standards provide to adopt altered ISO default mode, for example
“Size ISO 14405 ”.
symbol only applies to non-ISO GPS standard.
defined in default specification operator.
NOTE 1: The type of the added supplementary information (requirements) shall be defined
by specification modifier (see GB/Z 24637.2).
According to ISO basic specification, in the marked specific specification
operator, the operator that is not specified by the supplementary provisions
shall be still defined by default specification.
NOTE 2: At present, ISO GPS standard does not give default provisions on all specification
operations in all specification operators, so some ISO basic specifications are incomplete.
The contents specified in 7.2 shall be applied to the marks of the following two
specific specification operators:
- testing key elements that are comply with GB/T 1182, GB/T 131-2006, GB/T
17851 respectively;
- unique default specification of drawing.
7.2 Additional supplementary information (requirements) of ISO basic
specification
When necessary, the additional supplementary information (requirements) of
ISO basic specification can change the default operation of ISO basic
specification, for example:
a) fitting rule;
b) filter type;
c) transmission band;
d) probe tip;
e) extraction condition.
When these default specifications are changed for specific design needs, ISO
basic specification shall use the following modes to modify:
- for GB/T 1182, add information to the second block of the tolerance marking
box;
- for GB/T 131-2006, add information in a~e areas of graphic symbol that the
surface structure is complete;
- for ISO 14405-1, add modifier to tolerance mark.
See corresponding standards for details.
......
GB/T 4249-2009
Geometrical product specifications (GPS). Tolerancing principle
ICS 01.100.20; 17.040.10
J04
National Standards of People's Republic of China
Replacing GB/T 4249-1996
Geometrical product specifications (GPS)
Tolerance Principle
(ISO 8015. 1985, Technicaldrawings-
Fundamentaltolerancingprinciple, MOD)
Posted 2009-03-16
2009-11-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This revised standard adopts ISO 8015. 1985 "Mechanical Drawing basic principles of tolerance", in addition to increasing the terms and definitions in the text structure
In addition, with the ISO 8015. 1985 corresponds exactly to the basic content but also with ISO 8015. 1985 agreement. ISO GPS consistent with the standard system, into
Line some modifications as follows.
--- The standard name be bootable elements. Geometrical product specifications (GPS);
--- Definition section adds a new concept of the current GPS standards;
--- Added Appendix A "position in the GPS matrix model."
For ease of use, this standard of ISO 8015. 1985 also made the following editorial changes.
--- "This International Standard" be replaced by "this standard";
--- Remove the ISO 8015. 1985 Foreword.
This standard replaces GB/T 4249-1996 "tolerance principle", compared with the 1996 version, in addition to the above changes, the main changes are.
--- The "shape and position tolerances" to "geometric tolerances";
--- Increased in Chapter 3, the terms and definitions given entity boundary maximum and minimum entity boundary, inclusive definition of requirements;
--- Chapter 4 to Chapter 5, which will be described in the relevant section to do the appropriate changes and additions;
--- Chapter 5 Chapter 6 to simplify the maximum material requirement, the minimum physical demand and reversible demand content;
--- Deleted Appendix A (informative annex) "zero geometric tolerance."
Appendix A of this standard is an informative annex. This standard GPS location system in Appendix A.
The standard dimensions and geometry by the National Technical Committee of Standardization Technical specifications and centralized.
This standard was drafted. the machine Productivity Promotion Center, Xi'an Jiaotong University, Zhengzhou University and Zhongyuan University of Technology.
The main drafters of this standard. Lixiao Pei, Zhao Zhuoxian, Zhang Linna, Zhao Zexiang, Jing Wei Xuan, Zhaofeng Xia.
This standard replaces the standards previously issued as follows.
--- GB 4249-1984, GB/T 4249-1996.
Geometrical product specifications (GPS)
Tolerance Principle
1 Scope
This standard specifies the principles to determine the size (linear and angular dimensions) the relationship between tolerance and geometrical tolerances.
This standard applies to technical drawings and related documents marked size, dimensional tolerances and geometric tolerances, in order to determine the elements of large parts
Size, shape, orientation, and location features.
2 Normative references
The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent
Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research
Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.
Part 1 (GPS) Limits and fits GB/T 1800.1-2009 Geometrical product specifications. tolerances, deviations and fits the base
Basis (ISO 286-1. 1988, MOD)
GB/T 1182-2008 Geometrical product specifications (GPS) geometric tolerances of form, orientation, location and runout tolerancing
(ISO 1101.2004, IDT)
GB/T 16671-2009 Geometrical product specifications (GPS) Geometrical tolerancing - Maximum material requirement, the minimum physical demand and reversible
Requirements (ISO 2692.2006, MOD)
GB/T 18780.1-2002 Geometrical product specifications (GPS) - Geometrical features - Part 1. Basic terms and definitions
(ISO 14660-1.1999, IDT)
GB/T 18780.2-2003 Geometrical product specifications (GPS) - Geometrical features - Part 2. cylindrical and conical face lift
Take the center line, parallel to the plane of the central surface extraction, extract the local feature size (ISO 14660-2.1999, IDT)
GB /Z20308-2006 Geometrical product specifications (GPS) Master Plan (ISO /T R14638.1995, MOD)
3 Terms and Definitions
GB/T 1800.1-2009, GB/T 16671-2009, GB/T 18780.1-2002, to GB/T 18780.2-2003 established
And the following terms and definitions apply to this standard.
3.1
By a certain size of linear or angular dimensions to determine the size of the geometry.
[GB/T 18780.1-2002 in 2.2]
3.2
Composed in part by elements close to the actual (composition) elements defined by the actual surface of the workpiece.
[GB/T 18780.1-2002 2.4.1]
3.3
According to the method prescribed by the actual (composition) feature extraction actual number of priority points formed (composition) close substitutes elements.
[GB/T 18780.1-2002 2.5]
......
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