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INTERNATIONAL
STANDARD
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ISO
22081
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First edition
2021-02
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Geometrical product speciications
(GPS) — Geometrical tolerancing —
General geometrical speciications
and general size speciications
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Spéciication géométrique des produits (GPS) — Tolérancement
géométrique — Spéciications géométriques générales
générales et
spéciications de taille générales
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Reference number
ISO 22081:2021(E)
© ISO 2021
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ISO 22081:2021(E)
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COPYRIGHT PROTECTED DOCUMENT
© ISO 2021
All rights reserved. Unless otherwise speciied, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright ofice
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Email: copyright@is
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Website: www
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Published in Switzerland
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© ISO 2021 – All rights reserved
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ISO 22081:2021(E)
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Contents
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Page
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Foreword ........................................................................................................................................................................................................................................ iv
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Introduction..................................................................................................................................................................................................................................v
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1
Scope................................................................................................................................................................................................................................. 1
2
Normative
Normativ
e references...................................................................................................................................................................................... 1
3
Terms and deinitions ..................................................................................................................................................................................... 1
4
Basic principles...................................................................................................................................................................................................... 2
4.1
General........................................................................................................................................................................................................... 2
4.2
Basic rule...................................................................................................................................................................................................... 2
4.3
Indication in a technical product documentation (TPD).................................................................................... 3
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General geometrical speciication ..................................................................................................................................................... 3
5.1
Rule for indicating the general geometrical speciication ................................................................................. 3
5.2
Rule for the applicability of the general geometrical speciication ........................................................... 4
5.3
Rules for the datum system.......................................................................................................................................................... 6
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General size speciications......................................................................................................................................................................... 7
6.1
Rule for indicating general size speciications ............................................................................................................ 7
6.2
Rule for the applicability of general size speciications ...................................................................................... 7
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Annex A (informative) Example of indication with reference to a table in the TPD........................................... 9
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Annex B (informative) Examples........................................................................................................................................................................... 10
Annex C (informative) Relation to the GPS matrix model............................................................................................................13
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Bibliography ............................................................................................................................................................................................................................. 14
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© ISO 2021 – All rights reserved
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ISO 22081:2021(E)
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Foreword
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ISO (the International Organization
Organiz ation for Standardization
Standardizat ion)) is a worldwide federation of national standards
sta ndards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
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ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical
electrotechni
cal standardization.
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The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www
www.iso
.iso.org/
.org/directives
directives).
).
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Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identiied during the development of the document will be in the Introduction and/or
www.iso
.iso.org/
.org/patents).
on the ISO list of patent declarations received (see www
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Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
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For
an explanation
of conformity
the voluntary
nature ofasstandards,
the meaning
of ISO
terms
expressions
related to
assessment,
well as information
about
ISO'sspeciic
adherence
to and
the
World
Wor
ld Trade
Trade Organization
Organizat ion (WTO) principles in the
t he Technical
Technical Barriers to
t o Trade
Trade (TBT),
(TBT ), see www
www.iso
.iso.org/
.org/
iso/foreword
iso/
foreword.html
.html..
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This document
docu ment was prepared by Technical Committee
Commit tee ISO/TC 213, Dimensional and geometrical product
speciications and veriication, in collaboration with the European Committee for Standardization (CEN)
Technical Committee CEN/TC 290, Dimensional and geometrical product speciication and veriication, in
accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
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This irst edition cancels and replaces ISO 2768-2:1989, which has been technically revised.
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The main changes to ISO 2768-2:1989 are as follows:
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— tools have been added
added to specify a general geometrical speciication
speci ication and a general
general size speci
speciication;
ication;
— the rules for application of general
general geometrica
geometricall speciication
speciicat ion and general
general size speci
speciication
ication have
been clariied.
Any feedback or questions on this document
docu ment should
should be directed
direct ed to the user’s national standards
st andards body. A
complete listing of these bodies can be found at www
www.iso
.iso.org/
.org/members
members.html
.html..
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© ISO 2021 – All rights reserved
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ISO 22081:2021(E)
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Introduction
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This document is a geometrical product speciication (GPS) standard and is to be regarded as a general
GPS standard (see ISO 14638). It inluences chain links A, B and C of the chain of standards on size,
distance, form, orientation and location.
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The ISO/GPS matrix model given in ISO 14638 gives an overview of the ISO/GPS system of which this
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document
a part. rules
The fundamental
rules of ISO/GPS
given
in ISO 8015made
applyintoaccordance
this document
the defaultis
decision
given in ISO 14253-1
apply to the
speciications
with and
this
document, unless otherwise indicated.
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C
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For more detailed information of the relation of this document to other standards and the GPS matrix
model, see Annex C .
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This document deals with general geometrical speciication and general size speciications, which can
be used to reduce the number
number of individual speciication
speciic ation indications in technical
technica l product documentat
documentation
ion
(TPD). Many geometrical features have individual speciications which are similar or identical. As an
alternative, general geometrical speciications, general size speciications or both may be applied.
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All igures in this document for the 2D drawing indications have been drawn in irst-angle projection
with dimensions and tolerances in millimetres. It should be understood that third-angle projection
and other units of measurement could have been used equally well without prejudice to the principles
established.
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The igures in this document represent either 2D drawing views or 3D axonometric views and
are intended to illustrate how a speciication can be fully indicated with visible annotation. For
possibilities of illustrating a speciication where elements of the speciication may be available through
a query function or other interrogation of information on the 3D CAD model, and rules for attaching
speciications to 3D CAD models, see ISO 16792.
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All igures are not complete and should not be seen as a way to fully specify a part. Theoretically exact
dimensions (TED) which are not indicated are assumed to be obtained from the 3D CAD model.
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© ISO 2021 – All rights reserved
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INTERNATIONAL ST
STANDARD
ANDARD
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ISO 22081:2
22081:2021(E)
021(E)
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Geometrical product speciications (GPS) — Geometrical
tolerancing
toleran
cing — General geometrical speciications and
general size speciications
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Scope
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This document gives rules for deinition and interpretation of general geometrical speciications and
general size speciic
spec iications
ations deined according
accordi ng to ISO 8015:201
8015:2011,
1, 5.12.
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General speciications deined in other standards, and the link to these standards, are not covered by
this document.
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The general geometrical speciications and general size (linear or angular) speciications deined in
this document apply only to integral features (including features of size).
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These speciicat
speci ications
ions do not apply to derived features or integral
i ntegral lines
l ines (see ISO 17
17450450-1
1 for the deinitions
dei nitions
of integral features and derived features).
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Dimensions other than linear or angular sizes (see ISO 14405-2) are not covered by this document.
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Normative references
1
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2
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the
t he latest edition
edi tion of the referenced document (including any amendmen
a mendments)
ts) applies.
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speci ications (GPS) — Fundamentals
Fundamentals — Concepts, principles and rules
ISO 8015, Geometrical product speciications
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speci ications (GPS)
(GPS) — General concepts — Part 1: Model for geometrical
geometr ical
ISO 17
17450-1,
450-1, Geometrical product speciications
speciication and veriication
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t
ISO 17450-2, Geometrical product speciications (GPS) — General concepts — Part 2: Basic tenets,
speciications, operators, uncertainties and ambiguities
ISO 22432, Geometrical product speciications
speci ications (GPS) — Features utilized in speciication and veriication
ISO 25378, Geometrical product speciications (GPS) — Characteristics and conditions — Deinitions
3
Terms and deini
deinitions
tions
For the purposes of this
th is document, the terms
t erms and deinit
deinitions
ions given in ISO 8015, ISO 1745017450-1,
1, ISO 1745017450-2,
2,
ISO 22432 and ISO 25378 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
https://www
www.iso
.iso.org/
.org/obp
obp
— ISO Online browsing platform: available at https://
— IEC Elect
Electropedia:
ropedia: available at http://
http://www
www.electropedia.org/
3.1
general geometrical speciication
geometrical speciication indicated in the technical product documentation (TPD) which is not an
individual speciication
© ISO 2021 – All rights reserved
1
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ISO 22081:2021(E)
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3.2
general size speciication
speci ication
size speciication (linear size speciication or angular size speciication) indicated in the technical
product documentation (TPD) which is not an individual speciication
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Note 1 to entry: Linear size speciications are deined in ISO 14405-1.
14405-1. Angular size speciications are deined in
ISO 14405-3.
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3.3
integral feature
geometrical feature belonging to the real surface of the workpiece or to a surface model
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Note 1 to entry: An integral feature is intrinsically deined, e.g. skin
ski n of the workpiece.
workpiece.
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Note 2 to entry: For the statement of speciications, features obtained from partition of the surface model or of
real surface of workpiece shall be deined. These
T hese features, called “ integral features”, are models of the different
physical parts of the workpiece that have speciic functions, especially those in contact with the adjacent
workpieces.
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h
c
e
t
.
s
n
o
i
t
p
e
t
.
Note 3 to entry: An integral feature can be identiied, for example, by:
c
o
m
,
—
d
a part
partition
ition of the surface model;
o
w
n
l
o
—
a
d
a partition of another integral feature;
e
d
o
n
—
2
a collection of other integra
integrall featu
features.
res.
0
2
10
4
-
[SOURCE: ISO 17450-1:2
17450-1:2011,
011, 3.3.5]
3.3. 5]
1
5
1
8
:
5
8
4
:
2
Basic principles
5
+
0
0
0
0
b
y
4.1 General
U
n
i
v
r
e
When using general geometrical speciications or general size speciications, the designer should be
aware of the following risks:
T
f
o
y
t
i
s
o
r
— overloo
overlooking
king important funct
functional
ional requirements;
o
n
t
o
— selecting unnecessarily tight tolerances regarding the func
functional
tional requirement.
It is the responsibility of the designer to ensure that:
— func
functional
tional requirements are properly deined;
— the geometrical features in
inluencing
luencing the funct
functions
ions are properly speci
speciied;
ied;
— the entire
entire part, i.e. all geometrica
geometricall feature
features,
s, is completely and unambiguously speci
speciied.
ied.
General geometrical speciication and general size speciication are ways of minimising the number of
indications in a TPD.
4.2
Basic rule
This document deines two types of general speciications:
— general geometrical speci
speciications;
ications;
— general size speci
speciications.
ications.
Rule A: only the speciications deined in Tables 1 and 2 shall be used to deine general geometrical
speciications, general size speciications or both on integral features.
2
© ISO 2021 – All rights reserved
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ISO 22081:2021(E)
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i
u
a
c
l
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i
l
n
c
o
i
e
o
n
r
4.3
s
e
Indication in a technical product documentation (TPD)
d
d
i
s
t
t
o
r
i
U
u
i
n
Rule B: to apply general geometrical speciications, general size speciications or both according to
this document, it shall be clearly indicated in or near the title block or in the product deinition data set
according to the following rules:
b
t
v
i
e
o
r
n
s
i
i
t
s
y
p
o
e
f
r
m
T
t
r
i
— wording ‘General tolerances’
tolerances’ followed by a reference to this document (i.e. ISO 22081),
22081), followed
by the indication of the general geometrical speciications, the indication of the general size
o
t
o
e
n
d
ec
T
y
b
o
t
.
1).
speciications or both (see Figure 1).
h
s
t
r
e
e
t
L
L
C
,
s
u
b
s
c
r
i
p
t
i
o
n
s
.
t
e
c
h
s
t
r
e
e
t
.
c
o
m
,
d
o
w
n
l
o
a
d
e
d
o
n
2
0
2
10
4
1
5
1
8
:
5
8
:
Figure 1 — Indication of general geometrical speciications and general size speciications
2
5
+
0
0
0
0
b
The tolerance values can be deined as:
y
U
n
i
v
— single values; or
e
r
s
i
t
y
— variable values.
o
f
T
o
r
o
Variable values may be dependent on either or both of:
n
t
o
U
s
e
— the dimensions of these integra
integrall featur
features;
es;
r
.
— the distance of the integral feature to the datum system (the
(the TEDs).
TEDs).
When variable tolerance values are used, unambiguous rules should be deined to obtain these values
from a table
t able (see
(see Annex A) or from other documents (see Figure 2).
2).
Figure 2 — Example of indications with the tolerance values tabled in a referenced document
5
5.1
General geometrical speciication
Rule for indicating the general geometrical speciication
Rule C: the general geometrical speciication (see 3.1
3.1)) shall be indicated with a surface proile
speciication (see Table 1 and Figure 3).
© ISO 2021 – All rights reserved
3
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ISO 22081:2021(E)
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d
i
u
a
c
l
t
i
l
n
c
o
i
e
o
n
r
s
e
Table 1 — General geometrical speciication
d
d
i
s
t
t
o
r
Ty pe
i
U
u
i
n
E xample of spec i ic at ion indic at ions in or near t he t it le block
b
t
v
i
e
o
r
n
s
i
i
t
General geometrical speciication
s
y
p
o
e
f
r
T
t
r
NOTE See 5.3 for datum systems.
m
i
o
t
o
e
n
d
Apart from the characteristic (which can only be surface proile), any speciication element from
T
y
b
o
t
.
ec
ISO
5459 and
5459
ISO
11
01document.
may be used in general geometrical speci
s peciication
ication as long as they
t hey do not contradict
the rules
given
in1101
this
e
e
r
t
s
h
t
L
5.2
C
L
Rule for the applicability of the general
general geometrical speciication
u
s
,
b
Rule D: the general geometrical speciication shall apply to each integral feature independently on the
product, with the following exceptions (see Figure 3):
c
s
.
s
n
o
i
t
p
i
r
1)
e
t
an integral featur
feature
e speci
speciied
ied by a size speciication
speciicat ion (individual size speci
speciication
ication or
or general size
speciication);
.
t
e
e
r
t
s
h
c
c
m
o
2) an integra
integrall featur
feature
e or its derived
derived feature speci
speciied
ied by an individual geometric
geometrical
al speciication;
speciicat ion;
o
d
,
w
l
n
3) a datum featur
feature
e used in the datum system deined in the datum section of
of the general geometrical
speciication (see 5.3
5.3);
);
n
o
d
e
d
a
o
0
2
4) an integral feature indicated with simpli
simpliied
ied representation and not included in the CAD model, for
example edges, illets or screw threads.
5
1
-
4
0
1-
2
8
1
NOTE 1
General geometrical speciication
speciication applies
applies to integral features
features irrespective of
of a surface texture
speciication.
+
5
2
:
8
5
:
0
0
0
NOTE 2
The general geometrica
geometricall speci
speciications
ications are in accordance with the independency principle and the
feature principle.
n
U
y
b
0
NOTE 3
When individual speciications
speciicat ions are applied
applied on one or more portions of
of a single integral feature, any
other portion is considered as another integral feature.
v
i
o
y
t
i
s
r
e
f
T
o
r
o
n
t
o
U
s
e
r
.
4
© ISO 2021 – All rights reserved
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o
o
p
y
f
r
u
i
r
g
t
h
h
t
e
e
d
ISO 22081:2021(E)
r
r
m
p
t
e
a
r
e
o
r
d
i
u
a
c
l
t
i
l
n
c
o
i
e
o
n
r
s
e
d
d
i
s
t
t
o
r
i
U
u
i
b
n
t
v
i
e
o
r
n
s
i
i
t
s
y
p
o
e
f
r
m
T
t
r
i
o
t
o
e
n
d
b
o
t
.
y
T
ec
h
s
t
r
e
e
t
L
L
C
,
s
u
b
s
c
r
i
p
t
i
o
n
s
.
t
e
c
h
s
t
r
e
e
t
.
c
o
m
,
d
o
w
n
l
o
a
d
e
d
o
n
2
0
2
10
4
1
5
1
8
:
5
8
:
2
5
+
0
0
0
0
b
y
U
n
i
v
e
r
s
i
t
y
o
f
T
o
r
o
n
t
o
U
s
e
r
.
a) Indication in the TPD
© ISO 2021 – All rights reserved
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h
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ISO 22081:2021(E)
d
r
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p
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e
a
r
e
o
r
d
i
u
a
c
l
t
i
l
n
c
o
i
e
o
n
r
s
e
d
d
i
s
t
t
o
r
i
U
u
i
b
n
t
v
i
e
o
r
n
s
i
i
t
s
y
p
o
e
f
r
m
T
t
r
i
o
t
o
e
n
d
b
o
t
.
y
T
ec
h
s
t
r
e
e
t
L
L
C
,
s
u
b
s
c
r
i
p
t
i
o
n
s
.
t
e
c
h
s
t
r
e
e
t
.
c
o
m
,
d
w
o
b) Integral features with general geometrical
geometrical speci ication
a
o
l
n
NOTE 1
rule D.
e
d
The general geometrica
geometricall speci ication applies to the integra
integrall featur
features
es with shading in b), according to
n
o
d
2
0
2
NOTE 2
10
The general geometrica
geometricall speci
speciication
ication does not apply to:
4
1
5
—
1
the two planes
planes at 120° because they are speciied
speciie d by a general size speciic ation (rule
(rule D1);
D1);
8
5
:
8
:
—
5
2
the two parallel planes with 10 mm distance because they
they are speciied by an individual size speciication
(rule D1);
b
0
0
0
0
+
—
y
the two parallel planes
planes with 10
10 mm distance because
because the derived
derived feature is speciied by an individual
geometrical speciication (rule D2);
s
r
e
v
i
n
U
i
—
datum feature A because
because the integral feature is speciied
speciied by an individual
individual geometrical
geometrical speciication (rule D2)
D2);;
—
datum feature A because
because datum A is used in the datum section of
of the general
general geometrical
geometrical speciication
(rule D3);
T
f
o
y
t
s
U
o
t
n
o
r
o
e
—
datum feature B because
because the integral
integral feature is speciied by
by an individual
individual geometrical
geometrical speciication (rule D2)
D2);;
—
datum feature B because
because datum B is used in the datum
datum section of
of the general
general geometrical
geometrical speciication
(rule D3);
—
datum feature C because
because the integral feature is speciied by an individual geometrical
geometrical speciication
speciication (rule
(rule D2);
D2);
—
datum feature C because datum C is used in the datum section of
of the general
general geometrical
geometrical speciication
(rule D3);
—
the two planes
planes opposed
opposed to datum feature
feature C because the integral
integral features are speciied by an individual
individual
geometrical speciication (rule D2);
—
the two planes
planes opposed
opposed to datum feature A because
because the integral features are speciied
speciied by an individual
individual
geometrical speciication (rule D2).
NOTE 3
See additional examples in Annex B.
Figure 3 — Example of application of general geometrical speciication
5.3
Rules for the datum system
Rule E: in order to specify a general geometrical speciication, a datum system shall be established.
6
© ISO 2021 – All rights reserved
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ISO 22081:2021(E)
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u
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l
n
c
o
i
e
o
n
r
s
e
Rule F: the datum system indicated in a general geometrical speciication shall lock all degrees of
freedom necessary to locate the tolerance zones deined by the general geometrical speciication.
d
d
i
s
t
t
o
r
i
U
u
i
b
n
t
v
i
e
o
r
s
NOTE 1
This datum system does not necessari
necessarily
ly consist of
of three datums and does not necessar
necessarily
ily lock all six
degrees of freedom.
n
i
i
t
s
y
p
o
e
f
r
Each of the datum features identiied in the datum section of the general geometrical speciication
should have individual speciications, as they are not covered by the general geometrical speciication.
m
T
t
r
i
o
t
o
e
n
d
T
y
b
o
t
.
ec
NOTE 2
The general geometrica
geometricall speci ication applies to any additional datum featu
features
res according to the rules
stated in this document.
L
t
e
e
r
t
s
h
L
C
,
6
s
u
General size speciications
b
s
c
r
i
p
t
i
6.1
o
Rule for indicating general size speciications
n
s
.
t
e
c
s
h
Rule G: the general size speciications (see 3.2
3.2)) shall be indicated with a linear size, an angular size or
both (see Table 2 and Figure 4).
m
o
c
.
t
e
e
r
t
,
d
o
Table 2 — General size speciications
w
n
l
o
a
Ty pe
General size speciication
a
b
d
e
Speci ic at ion indic at ions in or near t he t it le block
Linear sizes: +t 5/−
/−tt6 or ± t 5 or
d
o
n
JS n/jsna,b
2
0
2
1-
Angular sizes : +t7°/−t8° or ± t7°
0
4
1
5
n represents the tolerance grade according to ISO 286-1 and ISO 286-2 (e.g. JS13/js13).
1
8
:
5
8
“JS/js” is only an example; any fundament al deviat
deviation
ion deined in ISO 286 can be used.
:
2
5
+
0
0
Any speciicat
speci ication
ion element
element from ISO 14405-1
14405-1 and ISO 14405-3
14405-3 may be used in
i n general size speciic
spec iications
ations
as long as they do not contradict the rules given in this document.
U
y
b
0
0
n
i
v
6.2
e
r
Rule for the applicability of general size speciications
s
i
t
y
Rule H: general size speciications shall apply to each feature of size which is identiied in the TPD by
one of the following methods:
f
o
U
o
t
n
o
r
o
T
s
1) By a size indication deining the nominal
nominal value of the linear or angula
angularr size (see Figure 4) which:
e
r
.
— has no individual tolerance;
— is not a TED; and
— is not an auxili
auxiliary
ary dimension.
2) By a CAD attribute
attr ibute which deines
deines the nominal value of
of the feature of size.
NOTE 1
General size speciications
speciications appl
apply
y to features of
of size irrespective of
of a surface texture speciication.
NOTE 2
General size speciications
speciications appl
apply
y to features of
of size irrespective of
of a geometrical speciication.
© ISO 2021 – All rights reserved
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h
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ISO 22081:2021(E)
r
m
p
t
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a
r
e
o
r
d
i
u
a
c
l
t
i
l
n
c
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o
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s
e
d
d
i
s
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t
o
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i
U
u
i
b
n
t
v
i
e
o
r
n
s
i
i
t
s
y
p
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f
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m
T
t
r
i
o
t
o
e
n
d
b
o
t
.
y
T
e
c
h
s
t
r
e
e
t
L
L
C
,
s
u
b
s
c
r
i
p
t
i
o
n
s
.
t
e
c
h
s
t
r
e
e
t
.
c
o
m
,
d
o
w
n
l
o
a
d
e
d
o
n
a) Indication in the TPD
2
0
2
10
4
1
5
1
8
:
5
8
:
2
5
+
0
0
0
0
b
y
U
n
i
v
e
r
s
i
t
y
o
f
T
o
r
o
n
t
o
U
s
e
r
.
b) Features of size with general size speciications
NOTE 1
General size speci ications apply
apply to the features of size with shading
shading in b), according to rule H.
NOTE 2
According to rule H, the general size speci
speciications
ications do not apply to:
—
the two paral
parallel
lel planes with the dimension 25
25 mm because 25 is a TED;
—
the two paral
parallel
lel planes with the dimension 50 mm because 50 is an auxi
auxiliar
liary
y dimension.
Figure 4 — Example of application of general size speciications
8
© ISO 2021 – All rights reserved
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o
o
p
y
f
r
u
i
r
g
t
h
h
t
e
e
d
ISO 22081:2021(E)
r
r
m
p
t
e
a
r
e
o
r
d
i
u
a
c
l
t
i
l
n
c
o
i
e
o
n
r
s
e
d
d
Annex A
(informative)
i
s
t
t
o
r
i
U
u
i
b
n
t
v
i
e
o
r
n
s
i
i
t
s
y
p
o
e
f
Example of indication with reference to a table in the TPD
r
m
T
t
r
i
o
t
o
e
n
d
b
o
t
.
y
T
e
c
h
s
r
t
Figure A.1 shows an example of general size speciication where tolerance values are deined with a
reference to a table in the TPD.
,
C
L
L
t
e
e
s
u
b
s
c
r
i
p
t
i
o
n
s
.
t
e
c
h
s
t
a) Indication
r
e
e
t
.
c
o
m
,
d
o
w
n
l
o
a
d
e
d
b) Table
o
n
2
0
2
1-
Figure A.1 — Example of indication with reference to a table in the TPD
0
4
1
5
1
8
:
5
8
:
2
5
+
0
0
0
0
b
y
U
n
i
v
e
r
s
i
t
y
o
f
T
o
r
o
n
t
o
U
s
e
r
.
© ISO 2021 – All rights reserved
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h
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e
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d
ISO 22081:2021(E)
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r
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u
a
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l
t
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l
n
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Annex B
(informative)
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Examples
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B.1 Example with integral
integral features
features on which the
the location is not speciied
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Figure B.1 shows an example with integral features on which the location is not speciied.
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NOTE
—
10
This speci
speciication
ication is incomplete.
The general geometrica
geometricall speciication
speciicat ion does not
not apply
apply to the two planes at 120°,
120°, because they are speciied by
a general size speciication (rule D1). For this reason, the location of the two planes is not deined.
© ISO 2021 – All rights reserved
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ISO 22081:2021(E)
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—
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The general geometrica
geometricall speciication
speciicat ion does not apply to the two parallel planes
planes with 10
10 mm dist
distance
ance because
they are speciied by an individual size speciication (rule D1). For this reason, the location of the two planes
is not deined.
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—
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The general geometrica
geometricall speciicat ion does not
not apply
apply to the two planes opposed to datum feature A because
the integral features are speciied by an individual geometrical
geometrical speciication
speci ication (Rule D2).
D2). The location of the
two planes is not deined because only a parallelism tolerance is speciied.
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Figure B.1 — Example with integral features on which the location is not speciied
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B.2 Example with two datums
datums in the datum system
system of the general geometrical
speciication
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Figure B.2 shows an example with two datums in the datum system of the general geometrical
speciication.
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The datum system A-B|C locks all the necessary degrees of freedom, according to rule F.
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Figure B.2 — Example
E xample with two datums in the datum system of the general geometrical
speciication
B.3 Example where
where the
the indication of the general size speciication is missing
The speciication in Figure B.3 is incomplete: the two dimensions 10 have no tolerance because the
general size speciication is not indicated in the TPD.
© ISO 2021 – All rights reserved
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ISO 22081:2021(E)
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Figure B.3 — Example where the indication of the general size speciication is missing
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© ISO 2021 – All rights reserved
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ISO 22081:2021(E)
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Annex C
(informative)
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Relation to the GPS matrix model
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C.1 General
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For full details about the GPS matrix model, see ISO 14638.
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C.2 Information about this document and its use
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This document deals with general tolerancing as a way to simplify TPD.
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C.3 Position in the GPS matrix model
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This document is a general
general GPS standard that in luences chain links A, B and C of
of the chains of standards
in the general GPS matrix, as graphically illustrated in Table C.1.
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Table C.1 — Position in the GPS matrix model
1
5
1
8
:
5
Chain links
8
:
2
5
A
B
C
D
E
F
G
Symbols
and
indications
Feature
requirements
Feature
properties
Conformance
and nonconformance
Meas
Me
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entt
Measur
Meas
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equipment
Calibration
Size
•
•
•
Dist ance
•
•
•
Form
•
•
•
Or ient ation
•
•
•
L ocat ion
•
•
•
+
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Ru n-out
Proile surface
texture
Areal surface
texture
Surface
imperfections
C.4 Related International Standards
The related International Standards are those of the chains of standards indicated in Table C.1.
© ISO 2021 – All rights reserved
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ISO 22081:2021(E)
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sizes — Part 1: Basis of tolerances, deviations and its
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[6]
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1, Geometrical product speciications
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speciications
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0
2
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[8]
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ISO 14405-2, Geometrical product speciications (GPS) — Dimensional tolerancing — Part 2:
Dimensions other than linear or angular sizes
2
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1
-
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[9]
[10]
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5
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14
JEI TA ET-51
JEITA
ET-5102
02 Ver 1, Standard of 3D annotated models - Datum systems,
sys tems, JEITA general geometrical
tolerancing, simpliied shape representation, (2016), Standardization Subcommittee of the 3D
CAD Information Standardization Technical Committee (ISTEC) of the Japan Electronics and
Information Technology Industries Association (JEITA)
© ISO 2021 – All rights reserved
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ICS 17.040.40
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© ISO 2021 – All rights reserved