EN ISO 1101:2013

SLOVENSKI STANDARD
01-julij-2013
1DGRPHãþD
SIST EN ISO 1101:2006
SIST ISO 10578:1995
6SHFLILNDFLMDJHRPHWULMVNLKYHOLþLQL]GHOND7ROHULUDQMHJHRPHWULMVNLKYHOLþLQ
7ROHUDQFHREOLNHRULHQWDFLMHSRORåDMDLQRSOHWD,62LQFOXGLQJ&RU

Geometrical product specifications (GPS) - Geometrical tolerancing - Tolerances of form,
orientation, location and run-out (ISO 1101:2012, including Cor 1:2013)
Geometrische Produktspezifikation (GPS) - Geometrische Tolerierung - Tolerierung von
Form, Richtung, Ort und Lauf (ISO 1101:2012, including Cor 1:2013)
Spécification géométrique des produits (GPS) - Tolérancement géométrique -
Tolérancement de forme, orientation, position et battement (ISO 1101:2012, including
Cor 1:2013)
Ta slovenski standard je istoveten z: EN ISO 1101:2013
ICS:
01.100.20 Konstrukcijske risbe Mechanical engineering
drawings
17.040.10 Tolerance in ujemi Limits and fits
17.040.40 6SHFLILNDFLMDJHRPHWULMVNLK Geometrical Product
YHOLþLQL]GHOND*36 Specification (GPS)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 1101
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2013
ICS 01.100.20; 17.040.10 Supersedes EN ISO 1101:2005
English Version
Geometrical product specifications (GPS) - Geometrical
tolerancing - Tolerances of form, orientation, location and run-
out (ISO 1101:2012, including Cor 1:2013)
Spécification géométrique des produits (GPS) - Geometrische Produktspezifikation (GPS) - Geometrische
Tolérancement géométrique - Tolérancement de forme, Tolerierung - Tolerierung von Form, Richtung, Ort und Lauf
orientation, position et battement (ISO 1101:2012, y (ISO 1101:2012, einschließlich Cor 1:2013)
compris Cor 1:2013)
This European Standard was approved by CEN on 5 February 2013.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same
status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2013 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 1101:2013: E
worldwide for CEN national Members.

Contents Page
Foreword . 3

Foreword
The text of ISO 1101:2012, including Cor 1:2013 has been prepared by Technical Committee ISO/TC 213
“Dimensional and geometrical product specifications and verification” of the International Organization for
Standardization (ISO) and has been taken over as EN ISO 1101:2013 by Technical Committee CEN/TC 290
“Dimensional and geometrical product specification and verification” the secretariat of which is held by
AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by August 2013, and conflicting national standards shall be withdrawn at
the latest by August 2013.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 1101:2005.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Endorsement notice
The text of ISO 1101:2012, including Cor 1:2013 has been approved by CEN as EN ISO 1101:2013 without
any modification.
INTERNATIONAL ISO
STANDARD 1101
Third edition
2012-04-15
Geometrical product specifications
(GPS) — Geometrical tolerancing —
Tolerances of form, orientation, location
and run-out
Spécification géométrique des produits (GPS) — Tolérancement
géométrique — Tolérancement de forme, orientation, position et
battement
Reference number
ISO 1101:2012(E)
©
ISO 2012
ISO 1101:2012(E)
©  ISO 2012
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56  CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2012 – All rights reserved

ISO 1101:2012(E)
Contents Page
Foreword . iv
Introduction . v
1  Scope . 1
2  Normative references . 1
3  Terms and definitions . 2
4  Basic concepts . 4
5  Symbols . 5
6  Tolerance frame . 7
7  Toleranced features . 8
8  Tolerance zones . 10
9  Datums. 16
10  Supplementary indications . 19
11  Theoretically exact dimensions (TED) . 25
12  Restrictive specifications . 25
13  Projected tolerance zone . 27
14  Free state condition . 30
15  Interrelationship of geometrical tolerances. 30
16  Intersection planes . 30
17  Orientation planes . 33
18  Definitions of geometrical tolerances . 35
Annex A (informative) Former practices . 92
Annex B (normative) Assessment of geometrical deviations . 95
Annex C (normative) Relations and dimensions of graphical symbols . 99
Annex D (informative) Relation to the GPS matrix model . 101
Bibliography . 103

ISO 1101:2012(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards 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. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 1101 was prepared by Technical Committee ISO/TC 213, Dimensional and geometrical product
specifications and verification.
This third edition cancels and replaces the second edition (ISO 1101:2004) and ISO 10578:1992.
Representations of specifications in the form of a 3D model have been added.

iv © ISO 2012 – All rights reserved

ISO 1101:2012(E)
Introduction
This International Standard is a geometrical product specification (GPS) standard and is to be regarded as a
general GPS standard (see ISO/TR 14638). It influences chain links 1, 2 and 3 of the chain of standards on
form, orientation, location and run out, and chain link 1 of the chain of standards on datums.
The ISO GPS Masterplan given in ISO/TR 14638 gives an overview of the ISO GPS system of which this
document is a part. The fundamental rules of ISO GPS given in ISO 8015 apply to this document. The default
decision rules given in ISO 14253-1 apply to specifications made in accordance with this document, unless
otherwise stated.
For more detailed information on the relation of this International Standard to the GPS matrix model, see
Annex D.
This International Standard represents the initial basis and describes the required fundamentals for
geometrical tolerancing. Nevertheless, it is advisable to consult the separate standards referenced in Clause 2
and in Table 2 for more detailed information.
For the presentation of lettering (proportions and dimensions), see ISO 3098-2.
All figures in this International Standard for the 2D drawing indications have been drawn in first-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. For all figures giving tolerancing examples in 3D, the dimensions and tolerances are the same as
for the similar figures shown in 2D.
The figures in this International Standard illustrate the text and are not intended to reflect an actual application.
Consequently, the figures are not fully dimensioned and toleranced, showing only the relevant general
principles. Neither are the figures intended to imply a particular display requirement in terms of whether
hidden detail, tangent lines or other annotations are shown or not shown. Many figures have lines or details
removed for clarity, or added or extended to assist with the illustration of the text.
For a definitive presentation (proportions and dimensions) of the symbolization for geometrical tolerancing,
see ISO 7083.
Annex A of this International Standard has been provided for information only. It presents previous drawing
indications that have been omitted here and are no longer used.
It needs to be noted that the former use of the term “circularity” has been changed to the term “roundness” for
reasons of consistency with other standards.
Definitions of features are taken from ISO 14660-1 and ISO 14660-2, which provide new terms different from
those used in previous edition of this International Standard. The former terms are indicated in the text
following the new terms, between parentheses.
For the purposes of this International Standard, the terms “axis” and “median plane” are used for derived
features of perfect form, and the terms “median line” and “median surface” for derived features of imperfect
form. Furthermore, the following line types have been used in the explanatory illustrations, i.e. those
representing non-technical drawings for which the rules of ISO 128 (all parts) apply.
ISO 1101:2012(E)
Line type
Feature level Feature type Details
Visible Behind plane/surface
point
Nominal feature (ideal
integral feature line/axis wide continuous narrow dashed
feature)
surface/plane
point
narrow long dashed
derived feature line/axis narrow dashed dotted

dotted
face/plane
surface wide freehand narrow freehand
Real feature integral feature
continuous dashed
point
Extracted feature integral surface line wide short dashed narrow short dashed
surface
point
derived feature line wide dotted narrow dotted

face
point
wide doubled-dashed narrow double-dashed
Associated feature integral feature straight line
double-dotted double-dotted
ideal feature
point
narrow long dashed wide dashed
derived feature straight line
double-dotted double-dotted
plane
point line wide long dashed narrow long dashed
datum
surface/plane double-short dashed double-short dashed
Tolerance zone limits, line surface
continuous narrow narrow dashed
tolerances planes
Section, illustration line surface
narrow long dashed narrow dashed
plane, drawing plane,
short dashed short dashed
aid plane
Extension, dimension, line
leader and reference continuous narrow narrow dashed
lines
vi © ISO 2012 – All rights reserved

INTERNATIONAL STANDARD ISO 1101:2012(E)

Geometrical product specifications (GPS) — Geometrical
tolerancing — Tolerances of form, orientation,
location and run-out
IMPORTANT — The illustrations included in this International Standard are intended to illustrate the
text and/or to provide examples of the related technical drawing specification; these illustrations are
not fully dimensioned and toleranced, showing only the relevant general principles.
As a consequence, the illustrations are not a representation of a complete workpiece, and are not of a
quality that is required for use in industry (in terms of full conformity with the standards prepared by
ISO/TC 10 and ISO/TC 213), and as such are not suitable for projection for teaching purposes.
1 Scope
This International Standard contains basic information and gives requirements for the geometrical tolerancing
of workpieces.
It represents the initial basis and defines the fundamentals for geometrical tolerancing.
NOTE Other International Standards referenced in Clause 2 and in Table 2 provide more detailed information on
geometrical tolerancing.
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.
ISO 128-24:1999, Technical drawings — General principles of presentation — Part 24: Lines on mechanical
engineering drawings
ISO 1660:1987, Technical drawings — Dimensioning and tolerancing of profiles
ISO 2692:2006, Geometrical product specifications (GPS) — Geometrical tolerancing — Maximum material
requirement (MMR), least material requirement (LMR) and reciprocity requirement (RPR)
ISO 5458:1998, Geometrical Product Specifications (GPS) — Geometrical tolerancing — Positional
tolerancing
ISO 5459:2011, Geometrical product specifications (GPS) — Geometrical tolerancing — Datums and datum
systems
ISO 8015:2011, Geometrical product specifications (GPS) — Fundamentals — Concepts, principles and rules
ISO 10579:2010, Geometrical product specifications (GPS) — Dimensioning and tolerancing — Non-rigid
parts
ISO 12180-1:2011, Geometrical product specifications (GPS) — Cylindricity — Part 1: Vocabulary and
parameters of cylindrical form
ISO 1101:2012(E)
ISO 12180-2:2011, Geometrical product specifications (GPS) — Cylindricity — Part 2: Specification operators
ISO 12181-1:2011, Geometrical product specifications (GPS) — Roundness — Part 1: Vocabulary and
parameters of roundness
ISO 12181-2:2011, Geometrical product specifications (GPS) — Roundness — Part 2: Specification operators
ISO 12780-1:2011, Geometrical product specifications (GPS) — Straightness — Part 1: Vocabulary and
parameters of straightness
ISO 12780-2:2011, Geometrical product specifications (GPS) — Straightness — Part 2: Specification
operators
ISO 12781-1:2011, Geometrical product specifications (GPS) — Flatness — Part 1: Vocabulary and
parameters of flatness
ISO 12781-2:2011, Geometrical product specifications (GPS) — Flatness — Part 2: Specification operators
ISO 14660-1:1999, Geometrical Product Specifications (GPS) — Geometrical features — Part 1: General
terms and definitions
ISO 14660-2:1999, Geometrical Product Specifications (GPS) — Geometrical features — Part 2: Extracted
median line of a cylinder and a cone, extracted median surface, local size of an extracted feature
ISO 17450-2:— , Geometrical product specifications (GPS) — General concepts — Part 2: Basic tenets,
specifications, operators and uncertainties
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 14660-1 and ISO 14660-2 and the
following apply.
3.1
tolerance zone
space limited by one or several geometrically perfect lines or surfaces, and characterized by a linear
dimension, called a tolerance
NOTE See also 4.4.
3.2
intersection plane
plane, established from an extracted feature of the workpiece, identifying a line on an extracted surface
(integral or median) or a point on an extracted line
NOTE The use of intersection planes makes it possible to define toleranced features independent of the view.
3.3
orientation plane
plane, established from an extracted feature of the workpiece, identifying the orientation of the tolerance zone
NOTE 1 For a derived feature, the use of an orientation plane makes it possible to define the direction of the width of
the tolerance zone independent of the TEDs (case of location) or of the datum (case of orientation).
NOTE 2 The orientation plane is only used when the toleranced feature is a median feature (centre point, median
straight line) and the tolerance zone is defined by two parallel straight lines or two parallel planes.

To be published. (Revision of ISO/TS 17450-2:2002)
2 © ISO 2012 – All rights reserved

ISO 1101:2012(E)
3.4
direction feature
feature, established from an extracted feature of the workpiece, identifying the direction of the width of the
tolerance zone
NOTE 1 The direction feature can be a plane, a cylinder or a cone.
NOTE 2 For a line in a surface, the use of a direction feature makes it possible to change the direction of the width of
the tolerance zone.
NOTE 3 The direction feature is used on a complex surface or a complex profile when the direction of the tolerance
value is not normal to the specified geometry.
NOTE 4 By default, the direction feature is a cone, a cylinder or a plane constructed from the datum or datum system
indicated in the second compartment of the direction feature indicator. The geometry of the direction feature depends on
the geometry of the toleranced feature.
3.5
compound contiguous feature
feature composed of several single features joined together without gaps
NOTE 1 A compound contiguous feature can be closed or not.
NOTE 2 A non-closed compound contiguous feature can be defined by the way of using the “between” symbol
(see 10.1.4).
NOTE 3 A closed compound contiguous feature can be defined by the way of using the “all around” symbol
(see 10.1.2). In this case, it is a set of single features whose intersection with any plane parallel to a collection plane is a
line or a point.
3.6
collection plane
plane, established from a nominal feature on the workpiece, defining a closed compound contiguous feature
NOTE The collection plane may be required when the “all around” symbol is applied.
3.7
theoretically exact dimension
TED
dimension indicated on technical product documentation, which is not affected by an individual or general
tolerance
NOTE 1 For the purpose of this International Standard, the term “theoretically exact dimension” has been abbreviated
TED.
NOTE 2 A theoretically exact dimension is a dimension used in operations (e.g. association, partition, collection, …).
NOTE 3 A theoretically exact dimension can be a linear dimension or an angular dimension.
NOTE 4 A TED can define
 the extension or the relative location of a portion of one feature,
 the length of the projection of a feature,
 the theoretical orientation or location from one or more features, or
 the nominal shape of a feature.
NOTE 5 A TED is indicated by a rectangular frame including a value.
ISO 1101:2012(E)
4 Basic concepts
4.1 Geometrical tolerances shall be specified in accordance with functional requirements. Manufacturing
and inspection requirements can also influence geometrical tolerancing.
NOTE Indicating geometrical tolerances does not necessarily imply the use of any particular method of production,
measurement or gauging.
4.2 A geometrical tolerance applied to a feature defines the tolerance zone within which that feature shall
be contained.
4.3 A feature is a specific portion of the workpiece, such as a point, a line or a surface; these features can
be integral features (e.g. the external surface of a cylinder) or derived (e.g. a median line or median surface).
See ISO 14660-1.
4.4 According to the characteristic to be toleranced and the manner in which it is dimensioned, the
tolerance zone is one of the following:
 the space within a circle;
 the space between two concentric circles;
 the space between two equidistant lines or two parallel straight lines;
 the space within a cylinder;
 the space between two coaxial cylinders
 the space between two equidistant surfaces or two parallel planes;
 the space within a sphere.
4.5 Unless a more restrictive indication is required, for example by an explanatory note (see Figure 8), the
toleranced feature may be of any form or orientation within this tolerance zone.
4.6 The tolerance applies to the whole extent of the considered feature unless otherwise specified as in
Clauses 12 and 13.
4.7 Geometrical tolerances which are assigned to features related to a datum do not limit the form
deviations of the datum feature itself. It may be necessary to specify tolerances of form for the datum
feature(s).
4 © ISO 2012 – All rights reserved

ISO 1101:2012(E)
5 Symbols
See Tables 1 and 2.
Table 1 — Symbols for geometrical characteristics
Tolerances Characteristics Symbol Datum needed Subclause
Straightness no 18.1
Flatness no 18.2
Roundness no 18.3
Form
Cylindricity no 18.4
Profile any line no 18.5
Profile any surface no 18.7
Parallelism yes 18.9
Perpendicularity yes 18.10
Orientation Angularity yes 18.11

Profile any line yes
Profile any surface yes
Position yes or no 18.12
Concentricity (for centre points) yes 18.13

Coaxiality (for axes) yes 18.13

Location
Symmetry yes 18.14
Profile any line yes 18.6
Profile any surface yes 18.8
Circular run-out yes 18.15
Run-out
Total run-out yes 18.16
ISO 1101:2012(E)
Table 2 — Additional symbols
Description Symbol Reference
Toleranced feature indication Clause 7

Datum feature indication Clause 9 and ISO 5459

Datum target indication ISO 5459

Theoretically exact dimension Clause 11

Median feature Clause 7
Unequally disposed tolerance zone Subclause 10.2

Between Subclause 10.1.4
From … to Subclause 10.1.4
Projected tolerance zone Clause 13

Maximum material requirement Clause 14 and ISO 2692

Least material requirement Clause 15 and ISO 2692

Free state condition (non-rigid parts) Clause 16 and ISO 10579

All around (profile) Subclause 10.1

Envelope requirement ISO 8015
Common zone Subclause 8.5
Minor diameter Subclause 10.2
Major diameter Subclause 10.2
Pitch diameter Subclause 10.2
Line element Subclause 18.9.4
Not convex Subclause 6.3
Any cross-section Subclause 18.13.1

Direction feature Subclause 8.1

Collection plane Subclause 10.1.2

Intersection plane Clause 16
Orientation plane Clause 17
6 © ISO 2012 – All rights reserved

ISO 1101:2012(E)
6 Tolerance frame
6.1 The requirements are shown in a rectangular frame which is divided into two or more compartments.
These compartments contain, from left to right, in the following order (see the examples in Figures 1, 2, 3, 4
and 5):
 first compartment: the symbol for the geometrical characteristic;
 second compartment: the width of the tolerance zone in the unit used for linear dimensions and
complementary requirements (see Clauses 7, 8, 10, and 12 to 16). If the tolerance zone is circular or
cylindrical, the value is preceded by the symbol “ ”. If the tolerance zone is spherical, the value is
preceded by “S ”;
 third and subsequent compartment, if applicable: the letter or letters identifying the datum or common
datum or datum system (see the examples in Figures 2, 3, 4 and 5).

Figure 1 Figure 2 Figure 3 Figure 4 Figure 5
6.2 When a tolerance applies to more than one feature this shall be indicated above the tolerance frame by
the number of features followed by the symbol “” (see the examples in Figures 6 and 7).

Figure 6 Figure 7
6.3 If required, indications qualifying the form of the feature within the tolerance zone shall be written near
the tolerance frame (see the example in Figure 8).

NOTE  See also Table 2.
Figure 8
6.4 If it is necessary to specify more than one geometrical characteristic for a feature, the requirements may
be given in tolerance frames one under the other for convenience (see the example in Figure 9).

Figure 9
6.5 If required, indications qualifying the direction of the tolerance zone or the extracted (actual) line or both
shall be written after the tolerance frame, e.g. use of intersection plane to indicate the direction of the
toleranced feature (see Clause 7), use of the orientation plane to indicate the orientation of the tolerance zone,
use of the direction feature to indicate the direction of the width of the tolerance zone (see Clause 8).
ISO 1101:2012(E)
7 Toleranced features
A geometrical specification applies to a single complete feature, unless an appropriate modifier is indicated.
When the toleranced feature is not a single complete feature, see Clause 10.
When the geometrical specification refers to the feature itself (integral feature), the tolerance frame shall be
connected to the toleranced feature by a leader line starting from either end of the frame and terminating in
one of the following ways:
 In 2D annotation, on the outline of the feature or an extension of the outline (but clearly separated from
the dimension line) (see Figures 10 and 11). The termination of the leader line is
 an arrow if it terminates on a drawn line, or
 a dot (filled or unfilled) when the indicated feature is an integral feature and the leader line terminates
within the bounds of the feature.
The arrowhead may be placed on a reference line using a leader line to point to the surface (see Figure 12).
 In 3D annotation, on the feature itself [see Figures 10 b) and 11 b)]. The termination of the leader line is a
dot. When the surface is visible, the dot is filled out; when the surface is hidden the dot is not filled out
and the leader line is a dashed line.
The termination of the leader line may be an arrow placed on a reference line using a leader line to point
to the surface [see Figure 12 b)]. The above rules for the dot terminating the leader line also apply in this
case.
a) 2D b) 3D
Figure 10
a) 2D b) 3D
Figure 11
8 © ISO 2012 – All rights reserved

ISO 1101:2012(E)
a) 2D b) 3D
Figure 12
When the tolerance refers to a median line, a median surface, or a median point (derived feature), it is
indicated either
 by the leader line starting from either end of the tolerance frame terminated by an arrow on the extension
of the dimension line of a feature of size [see the examples in Figures 13 a), 13 b), 14 a), 14 b), 15 a) and
15 b)], or
 by a modifier (median feature) placed at the rightmost end of the second compartment of the tolerance
frame from the left. In this case, the leader line starting from either end of the tolerance frame does not
have to terminate on the dimension line, but can terminate with an arrow on the outline of the feature [see
Figures 16 a) and 16 b)].
a) 2D b) 3D
Figure 13
a) 2D b) 3D
Figure 14
ISO 1101:2012(E)
a) 2D b) 3D
Figure 15
a) 2D b) 3D
Figure 16
If needed, an indication specifying the type of feature (line instead of a surface) shall be written near the
tolerance frame (see Figures 103 and 104).
NOTE When the toleranced feature is a line, a further indication may be needed to control the orientation of the
toleranced feature, see Figure 97 for the case of a median line and Figure 103 for the case of an integral line.
8 Tolerance zones
8.1 The tolerance zone is positioned symmetrically from an ideal feature unless otherwise indicated
(see 10.2). The tolerance value defines the width of the tolerance zone. This width applies normal to the
specified geometry (see Figures 17 and 18) unless otherwise indicated (see Figures 19 and 20).
NOTE The orientation alone of the leader line does not influence the definition of the tolerance zone, except in the
case where the orientation of the leader line and therefore the direction of the width of the tolerance zone is indicated by a
TED [see Figures 19 a) and 19 b), and 8.2].

10 © ISO 2012 – All rights reserved

ISO 1101:2012(E)
a
Datum A.
Drawing indication Interpretation
Figure 17 Figure 18
Drawing indication
a) 2D
b) 3D c) 3D
Figure 19
ISO 1101:2012(E)
NOTE 1 When the datum feature identified by the tolerance frame is the same as the feature establishing the direction
feature, then the direction feature can be omitted.
NOTE 2 In Figure 19, the theoretical shape of each toleranced feature is a circle. The straight segments are inclined by
the angle alpha. This generates a set of tolerance zones which are conical sections with a fixed angle along the surface.
When a direction feature is indicated as shown in Figure 19, the width of the tolerance zone is defined by an
infinite set of straight segments, inclined in the direction indicated by the direction feature indicator. Each of
these segments has a length equal to the tolerance value and has its midpoint located on the theoretical
shape of the tolerance zone by default.
The tolerance value is constant along the length of the considered feature, unless otherwise indicated by a
graphical indication, defining a proportional variation from one value to another, between two specified
locations on the considered feature, identified as given in 10.1.4. The letters identifying the locations are
separated by an arrow (see Figure 21 for restricted parts of a feature). The values are related to the specified
locations on the considered feature by the letters indicated over the tolerance frame (e.g. in Figure 21, the
value of the tolerance is 0,1 for location J and 0,2 for location K). By default, the proportional variation follows
the curvilinear distance, i.e. the distance along the curve connecting the two specified locations.

a
Datum A.
Interpretation
Figure 20
Figure 21
The angle  shown in Figure 19 shall be indicated, even if it is equal to 90°.
In the case of roundness, the width of the tolerance zone always applies in a plane perpendicular to the
nominal axis.
12 © ISO 2012 – All rights reserved

ISO 1101:2012(E)
8.2 In the case of a median feature (centre point, median line, median surface) toleranced in one direction:
 In 2D view, when the direction of the width of a tolerance zone is at 0° or 90° relative to the datum or
relative to the pattern of the theoretically exact dimensions without using an orientation plane, the arrow
of the leader line gives this direction (Figures 22, 23 and 24). In other cases, an orientation plane shall be
used.
Figure 22
 In 3D view, when the direction of the width of a tolerance zone is to be specified relative to the datum or
relative to the pattern of the theoretically exact dimensions, an orientation plane shall be indicated to
determine this direction [see Figure 23 b)].
 when two tolerances are stated, they shall be perpendicular to each other unless otherwise specified (see
the examples in Figures 23 and 24).

Drawing indication
a) 2D b) 3D
Figure 23
ISO 1101:2012(E)
a
Datum A.
b
Datum B.
Interpretation
Figure 24
8.3 The tolerance zone is cylindrical (see the examples in Figures 25 and 26) or circular if the tolerance
value is preceded by the symbol “ ” or spherical if it is preceded by the symbol “S ”.

a
Datum A.
Drawing indication Interpretation
Figure 25 Figure 26
14 © ISO 2012 – All rights reserved

ISO 1101:2012(E)
8.4 Individual tolerance zones of the same value applied to several separate features may be specified (see
the example in Figure 27).
Figure 27
8.5 Where a common tolerance zone is applied to several separate features, this common requirement
shall be indicated by the symbol “ ” for common zone following the tolerance in the tolerance frame [see the
examples in Figure 28 a)].
Where several tolerance zones (controlled by the same tolerance frame) are applied simultaneously to several
separate features (not independently), to create a combined zone, the requirement shall be indicated by the
” for common zone following the tolerance in the tolerance frame [see the example in Figure 28 b)]
symbol “
and an indication that the specification applies to several features [e.g. using “3 ” over the tolerance frame
(see 6.2), or using three leader lines attached to the tolerance frame (see 8.4)].
Where is indicated in the tolerance frame, all the related individual tolerance zones shall be constrained in
location and in orientation amongst themselves using either implicit (0 mm, 0°, 90°, etc.) or explicit
theoretically exact dimensions (TED).

a)
b)
Figure 28
ISO 1101:2012(E)
9 Datums
9.1 Datums shall be indicated as given in the examples in 9.2 to 9.5. For additional information, see
ISO 5459.
NOTE At the next revision of this International Standard, this clause will be moved to ISO 5459.
9.2 A datum related to a toleranced feature shall be designated by a datum letter. A capital letter shall be
enclosed in a datum frame and connected to a filled or open datum triangle to identify the datum [see the
examples in Figures 29 a), 29 b), Figures 30 a) and 30 b)]; the same letter which defines the datum shall also
be indicated in the tolerance frame. There is no difference in the meaning between a filled and an open datum
triangle.
a) 2D b) 3D
Figure 29
a) 2D b) 3D
Figure 30
9.3 The datum triangle with the datum letter shall be placed:
 in 2D annotation, on the outline of the feature or an extension of the outline (but clearly separated from
the dimension line), when the datum is the line or surface shown (see the example in Figure 31); the
datum triangle may be placed on a reference line using a leader line to point to the surface (see the
example in Figure 32);
a) 2D b) 3D
Figure 31
16 © ISO 2012 – All rights reserved

ISO 1101:2012(E)
a) 2D b) 3D
Figure 32
 in 3D annotation, when the datum is established from a datum feature which is not a feature of size, the
datum feature indicators shall not be in extension of a dimension line [see Figure 31 b)and Figure 32 b)],
and shall be indicated in one of the following ways:
 For a visible feature:
 on the feature itself, or
 on a reference line using a leader line terminated by a filled dot to point to the feature;
 For a non-visible feature:
 on a reference line using a dashed leader line terminated by an unfilled dot to point to the
feature, or
 on an extension line tangential to the feature and perpendicular to an outline of the feature,
which is clearly separated from the borders of the feature.
 as an extension of the dimension line, when the datum is the axis or median plane or a point defined by
the feature so dimensioned [see the examples in Figures 33 a) to 35 a) for 2D annotation and Figures 33
b) to 35 b) for 3D annotation], if there is insufficient space for two arrowheads, one of them may be
replaced by the datum triangle [see the examples in Figures 34 a) and 35 a) for 2D annotation and
Figures 34 b) and 35 b) for 3D annotation].

a) 2D b) 3D
Figure 33
ISO 1101:2012(E)
a) 2D b) 3D
Figure 34
a) 2D b) 3D
Figure 35
9.4 If a datum is applied to a restricted part of a feature only, this restriction shall be shown as a wide, long
dashed-dotted line and dimensioned (see the example in Figure 36). See ISO 128-24:1999, Table 2, 04.2.

a) 2D b) 3D
Figure 36
9.5 A datum established by a single feature is identified by a capital letter (see Figure 37).
A common datum established by two features is identified by two capital letters separated by a hyphen (see
the example in Figure 38).
Where a datum system is established by two or three features, i.e. multiple datums, the capital letters for
identifying the datums are indicated in an order of priority, from left to right, in separate compartments (see the
example in Figure 39).
18 © ISO 2012 – All rights reserved

ISO 1101:2012(E)
Figure 37 Figure 38 Figure 39
10 Supplementary indications
10.1 Indications of a compound or restricted toleranced feature
10.1.1 General
When the toleranced feature is a portion of a single feature, or a compound contiguous feature, then it shall be
indicated either as
 a contiguous, closed feature (single or compound), see 10.1.2,
 a restricted area of a single surface, 10.1.3, or
 a contiguous, non-closed feature (single or compound), see 10.1.4.
10.1.2 All around — Contiguous, closed toleranced feature
If a requirement applies to a closed compound contiguous surface defined by a collection plane, the “all
around” modifier (“O”) shall be placed on the intersection of the leader line and the reference line of the
tolerance frame. In 3D annotation, a collection plane indicator identifying the collection plane shall be placed
after the tolerance frame [see Figures 40 b) and 41 b)]. In 2D annotation, the collection plane can be implicit
parallel to the projection plane in which the specification is indicated. An all-around requirement applies only to
the surfaces represented by the outline, not to the entire workpiece (see Figure 41).
If a requirement applies to the set of line elements on the closed compound contiguous surface (defined by a
collection plane), an intersection plane indicator identifying the intersection plane shall also be placed between
the tolerance frame and the collection plane indicator in 3D annotation [see Figure 40 b)].
ISO 1101:2012(E)
a) 2D
NOTE When using the symbol of profile of any line, if the intersection
...