SIST EN ISO 5459:2011/oprA1:2022
(Amendment)Geometrical product specifications (GPS) - Geometrical tolerancing - Datums and datum systems - Amendment 1 (ISO 5459:2011/DAM 1:2022)
Geometrical product specifications (GPS) - Geometrical tolerancing - Datums and datum systems - Amendment 1 (ISO 5459:2011/DAM 1:2022)
Geometrische Produktspezifikation (GPS) - Geometrische Tolerierung - Bezüge und Bezugssysteme - Änderung 1 (ISO 5459:2011/DAM 1:2022)
Spécification géométrique des produits (GPS) - Tolérancement géométrique - Références spécifiées et systèmes de références spécifiées - Amendement 1 (ISO 5459:2011/DAM 1:2022)
Specifikacija geometrijskih veličin izdelka - Geometrijsko toleriranje - Reference in sistemi referenc - Dopolnilo A1 (ISO 5459:2011/DAM 1:2022)
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 5459:2011/oprA1:2022
01-december-2022
Specifikacija geometrijskih veličin izdelka - Geometrijsko toleriranje - Reference in
sistemi referenc - Dopolnilo A1 (ISO 5459:2011/DAM 1:2022)
Geometrical product specifications (GPS) - Geometrical tolerancing - Datums and datum
systems - Amendment 1 (ISO 5459:2011/DAM 1:2022)
Geometrische Produktspezifikation (GPS) - Geometrische Tolerierung - Bezüge und
Bezugssysteme - Änderung 1 (ISO 5459:2011/DAM 1:2022)
Spécification géométrique des produits (GPS) - Tolérancement géométrique -
Références spécifiées et systèmes de références spécifiées - Amendement 1 (ISO
5459:2011/DAM 1:2022)
Ta slovenski standard je istoveten z: EN ISO 5459:2011/prA1
ICS:
17.040.10 Tolerance in ujemi Limits and fits
17.040.40 Specifikacija geometrijskih Geometrical Product
veličin izdelka (GPS) Specification (GPS)
SIST EN ISO 5459:2011/oprA1:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 5459:2011/oprA1:2022
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SIST EN ISO 5459:2011/oprA1:2022
DRAFT AMENDMENT
ISO 5459:2011/DAM 1
ISO/TC 213 Secretariat: BSI
Voting begins on: Voting terminates on:
2022-10-24 2023-01-16
Geometrical product specifications (GPS) — Geometrical
tolerancing — Datums and datum systems
AMENDMENT 1
Spécification géométrique des produits (GPS) — Tolérancement géométrique — Références spécifiées et
systèmes de références spécifiées
AMENDEMENT 1
ICS: 17.040.10; 01.100.20
This document is circulated as received from the committee secretariat.
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
ISO/CEN PARALLEL PROCESSING
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO 5459:2011/DAM 1:2022(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION. © ISO 2022
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SIST EN ISO 5459:2011/oprA1:2022
ISO 5459:2011/DAM 1:2022(E)
DRAFT AMENDMENT
ISO 5459:2011/DAM 1
ISO/TC 213 Secretariat: BSI
Voting begins on: Voting terminates on:
Geometrical product specifications (GPS) — Geometrical
tolerancing — Datums and datum systems
AMENDMENT 1
Spécification géométrique des produits (GPS) — Tolérancement géométrique — Références spécifiées et
systèmes de références spécifiées
AMENDEMENT 1
ICS: 17.040.10; 01.100.20
This document is circulated as received from the committee secretariat.
COPYRIGHT PROTECTED DOCUMENT
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
© ISO 2022
ISO/CEN PARALLEL PROCESSING
THEREFORE SUBJECT TO CHANGE AND MAY
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
NOT BE REFERRED TO AS AN INTERNATIONAL
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on STANDARD UNTIL PUBLISHED AS SUCH.
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
IN ADDITION TO THEIR EVALUATION AS
or ISO’s member body in the country of the requester. BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
ISO copyright office
USER PURPOSES, DRAFT INTERNATIONAL
CP 401 • Ch. de Blandonnet 8
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
CH-1214 Vernier, Geneva
POTENTIAL TO BECOME STANDARDS TO
Phone: +41 22 749 01 11
WHICH REFERENCE MAY BE MADE IN
Reference number
Email: copyright@iso.org
NATIONAL REGULATIONS.
Website: www.iso.org ISO 5459:2011/DAM 1:2022(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
Published in Switzerland
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
ii
© ISO 2022 – All rights reserved
PROVIDE SUPPORTING DOCUMENTATION. © ISO 2022
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SIST EN ISO 5459:2011/oprA1:2022
ISO 5459:2011/DAM 1:2022(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.
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.iso.org/directives).
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 identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 213, Dimensional and geometrical product
specifications and verification.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iii
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SIST EN ISO 5459:2011/oprA1:2022
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SIST EN ISO 5459:2011/oprA1:2022
ISO 5459:2011/DAM 1:2022(E)
Geometrical product specifications (GPS) — Geometrical
tolerancing — Datums and datum systems
AMENDMENT 1
1 Clause 2
Replace Clause 2 by the following.
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 latest edition of the referenced document (including any amendments) applies.
ISO 128-2:2020, Technical product documentation (TPD) — General principles of representation — Part 2:
Basic conventions for lines
ISO 1101:2017, Geometrical product specifications (GPS) — Geometrical tolerancing — Tolerances of form,
orientation, location and run-out
ISO 2692, Geometrical product specifications (GPS) — Geometrical tolerancing — Maximum material
requirement (MMR), least material requirement (LMR) and reciprocity requirement (RPR)
ISO 17450-1, Geometrical product specifications (GPS) — General concepts — Part 1: Model for geometrical
specification and verification
ISO 17450-2, Geometrical product specifications (GPS) — General concepts — Part 2: Basic tenets,
specifications, operators, uncertainties and ambiguities
ISO 81714-1, Design of graphical symbols for use in the technical documentation of products — Part 1:
Basic rules
2 Clause 3
Replace the first sentence by the following:
For the purposes of this document, the terms and definitions given in ISO 1101, ISO 2692, ISO 17450-1,
ISO 17450-2 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
Delete definitions 3.14, 3.16, 3.22 and renumber the definitions.
Add at the end of Clause 3 the following new terms and definitions.
3.20
datum coordinate system
coordinate system established from a datum system
Note 1 to entry: The datum coordinate system can be used to describe the degrees of freedoms which are locked
by the datum system.
1
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SIST EN ISO 5459:2011/oprA1:2022
ISO 5459:2011/DAM 1:2022(E)
Note 2 to entry: Using a datum coordinate system is optional.
3.20.1
datum coordinate system indicator
indication defining a coordinate system
3.20.2
datum coordinate system identifier
label identifying a coordinate system
3 Clause 4
Replace the first row of Table 1 by the following.
Datum feature indicator 7.2.1
Add the following new rows to Table 1 after the row "Moveable datum target frame".
Single datum target indica-
7.4.2.1
tor
Moveable datum target
7.4.2.1
indicator
Add the following new rows at the end of Table 1.
Restricted datum feature 7.4.2.4
Indication of a situation fea-
ture of a datum or a datum (A-B)[PL] 7.4.2.11
system
Datum coordinate system Annex G
3D representation
In Table 2 add the following new lines before the line [DV] and add the at the end of Table 2.
[SV] Variable size 7.4.2.2
[SF] Fixed size 7.4.2.2
In Table 2 add the following note at the end of Table 2.
NOTE To refer to other symbols in link with filtration and association, see Table 6 and
Table H.1.
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SIST EN ISO 5459:2011/oprA1:2022
ISO 5459:2011/DAM 1:2022(E)
4 Subclause 6.1
Replace the NOTE by the following.
NOTE Datums and datum systems are situation features, not coordinate systems. A complete datum system
(allowing to lock all degrees of freedom) is a set of a point, a line and a plane (the point on the line in the plane).
Coordinate systems can be built on datums, see Annex G.
5 Subclause 6.2.1
Replace the whole 6.2.1 by the following.
The recommended status (variable or fixed) of the intrinsic characteristics is described in 6.2.2, 6.2.3
or 6.2.4. For rules, see also Rule 2 (2.A to 2.E) in 7.4.2.2.
For datums with virtual conditions, see ISO 2692.
For the issue of orientation and location constraints in datum systems, see Annex I.
6 Subclause 6.2.2
Replace the whole 6.2.2 by the following.
The recommended status of the intrinsic characteristics for a single feature is:
— variable for the linear size of a feature of size (see Table 3);
— fixed for the angular size of a feature of size (see Table 3);
— fixed for an intrinsic characteristic which is not the size of a feature of size.
Table 3 — Recommended status of intrinsic characteristics of features of size
Feature of size Invariance class Intrinsic characteristic Recommended status
Cylinder Cylindrical Diameter Variable
See example in C.1.2
Sphere Spherical Diameter Variable
See example in C.1.4
Two parallel opposite Planar Distance between the two Variable
planes planes See example in C.1.10
Cone Revolute Angle Fixed
See example in C.1.3
Wedge prismatic angle Fixed
See example in C.1.9
7 Subclause 6.2.3
Replace the first sentence by the following.
The recommended status (variable or fixed) of the intrinsic characteristics of each associated feature
establishing the common datum is as in 6.2.2.
8 Subclause 6.2.4
Replace the first sentence by the following.
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SIST EN ISO 5459:2011/oprA1:2022
ISO 5459:2011/DAM 1:2022(E)
The recommended status (variable or fixed) of the intrinsic characteristics of each associated feature
establishing the datum system is as in 6.2.2.
9 Subclause 7.2.1
Replace the whole 7.2.1 by the following.
A single feature to be used as a datum feature shall be indicated in a single place by a datum feature
indicator. The datum feature indicator consists of a box connected to a filled datum triangle or an open
datum triangle by a leader line, and optional adjacent indications (see Figure 5).
NOTE There is no difference in meaning between a filled and an open datum triangle.
Key
1 datum triangle
2 leader line
3 datum feature identifier area
4 adjacent indication area
Figure 5 — Datum feature indicator
10 Subclause 7.2.3.3
Replace twice "ISO 128-24:1999" by "ISO 128-2:2020".
11 Subclause 7.3
Replace the first paragraph by the following.
The datum (or datum system) is specified in the datum section of the tolerance indicator as described
in ISO 1101:2017, 8.2.
The datum (or datum system) is specified in an intersection plane indicator, or an orientation plane
indicator, or a direction feature indicator or a collection plane indicator as described in ISO 1101:2017,
Clauses 13 to 16.
See more details in Rule 6 in 7.4.2.6.
12 Subclause 7.4.2.1
In the first paragraph, replace the two first indents by the following.
— as an extension of a dimension line [see Figure 18 a) and Figure 18 b)];
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SIST EN ISO 5459:2011/oprA1:2022
ISO 5459:2011/DAM 1:2022(E)
— on a tolerance frame pointing to an extension of a dimension line for the surface [see Figure 18 e)
and Figure 18 f)];
Replace Figure 18 by the following.
Figure 18 — Attachment of a datum indicator for a single datum feature considered a feature of
size
In the paragraph after Figure 18, replace "complimentary" by "complementary".
Replace the four indents between Figure 18 and Figure 19 by the following.
— on the outline of the surface [see Figure 19 a)],
— on an extension line of the surface [see Figure 19 b)],
— on a reference line with a leader line having as terminator a dot [see Figure 19 c) for hidden surface
and Figure 19 d) for visible surface],
— on a tolerance frame pointing directly to the surface [see Figure 19 e)],
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SIST EN ISO 5459:2011/oprA1:2022
ISO 5459:2011/DAM 1:2022(E)
— on a tolerance frame pointing to an extension line of the surface [see Figure 19 f)],
— on a tolerance frame pointing to a reference line with a leader line having as terminator a dot [see
Figure 19 g)].
NOTE It is recommended to indicate the datum indicator on a view where the surface is not hidden.
Replace Figure 19 by the following.
Figure 19 — Attachment of a datum indicator for a single datum feature not considered a
feature of size
13 Subclause 7.4.2.2
Replace the entire 7.4.2.2 by the following.
7.4.2.2.1 Rule 2.A
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SIST EN ISO 5459:2011/oprA1:2022
ISO 5459:2011/DAM 1:2022(E)
If no dimension value is indicated above the dimension line placed in extension of the datum feature
indicator, then the size of the associated feature of size shall be considered:
— variable for the linear size of a feature of size [see Table 3 and Figure 19bis a)];
— fixed for the angular size of a feature of size (see Table 3). The size value is taken from the CAD
model. If the fixed size is different from the value in the CAD model, then the Rules 2.B or 2.E shall
be used.
7.4.2.2.2 Rule 2.B
If the dimension value indicated above the dimension line placed in extension of the datum feature
indicator is a TED, then the size of the associated feature of size shall be considered fixed [see
Figure 19bis e)].
7.4.2.2.3 Rule 2.C
If the dimension value indicated above the dimension line placed in extension of the datum feature
indicator has a tolerance value (individual or general), then the size of the associated feature of size
shall be considered variable [see Figure 19bis b)].
7.4.2.2.4 Explicit indication of the status of the size
7.4.2.2.4.1 General
The status of the size of the associated feature of size used to established a datum can be defined
independently of the indication of a dimension above the dimension line placed in extension of the
datum feature indicator with the explicit indication [SV] or [SF] placed immediately after the datum
identifier letter in the datum section of a specification. In this case, the Rules 2.A, 2.B and 2.C are
superseded by the Rules 2.D and 2.E.
7.4.2.2.4.2 Rule 2.D
When the [SV] modifier is indicated in the datum section, then the size of the associated feature of size
used to establish a datum shall be considered variable [see Figure 19bis c) and Figure 19bis d)].
7.4.2.2.4.3 Rule 2.E
When the [SF] modifier is indicated in the datum section, then the size of the associated feature of size
used to establish a datum shall be considered fixed.
When the modifier [SFnn] is used to define the fixed size of the associated feature of size, then the value
of the size shall be indicated without a space after the "SF", for example [SF10], [SF30°] in the datum
section.
NOTE 1 The modifiers [SV] and [SF] apply to both features of linear size and features of angular size.
NOTE 2 When the datum feature is a feature of size, if TEDs are indicated indirectly by a statement in or
near the title block that TEDs are extracted from the CAD file, for example by the following statement: "TED’s
according to CAD model 12345 rev abc", it is recommended that the [SF] or [SV] modifier is used in all cases to
prevent misinterpretation.
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SIST EN ISO 5459:2011/oprA1:2022
ISO 5459:2011/DAM 1:2022(E)
a) Variable size b) Variable size c) Variable size d) Variable size
[Rule 2.A] [Rule 2.C] [Rule 2.D] [Rule 2.D]
e) Fixed size f) Fixed size g) Fixed size h) Fixed size
[Rule 2.B] [Rule 2.E] [Rule 2.E] [Rule 2.E]
NOTE The size is a linear size, which is implicitly considered as variable [see Table 3 and Figure 20 a)], and
explicitly considered as variable or fixed for the other cases.
Figure 20 — Status of the linear size of a feature of size used to establish a single datum
14 Renumbering of Figures 19 to 40
Throughout the whole text, renumber Figure 19 to Figure 40 as Figure 20 to Figure 41.
15 Subclause 7.4.2.4
Replace the first paragraph, Figure 20, the text between Figure 20 and Figure 21, and Figure 21 by the
following.
If a single datum feature is established from one or more datum targets belonging to only one surface,
then one of the following indications shall be placed close to the datum indicator:
— the datum feature identifier identifying the surface, followed by the list of numbers, separated by a
comma and a space, identifying each datum target to be considered, see Figure 21 a);
— the datum feature identifier identifying the surface, followed by the first and last numbers separated
by a hyphen, identifying the set of datum targets to be considered (all datum targets between the
first and the last number are considered), see Figure 21 b).
Each individual datum target shall be identified by a datum target indicator, by placing its label in the
lower compartment of the datum target frame and defined with the datum feature identifier followed
by the identification number of the datum target and, if applicable, the dimensions of the datum target.
Each individual datum target shall be identified by a datum target indicator, indicating the datum
feature identifier, the number of the datum target and, if applicable, the dimensions of the datum target.
a) b)
Figure 21 — Indication of a datum feature defined from datum targets
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SIST EN ISO 5459:2011/oprA1:2022
ISO 5459:2011/DAM 1:2022(E)
If there is only one datum target, the datum feature defined as a restricted area may be defined as
complement of Rule 1 of datum feature indication :
— by a drawing indication, the datum feature is placed directly on it;
— or by using the labels of the corners or of the boundaries of restricted area, the datum feature
indication is placed anywhere on the complete feature drawing indication, completed in adjacent
area by description of the area using the between symbol and the labels [for 2D, see Figure 22 c), for
3D, see Figure 22 f)].
If there is only one datum target, the restricted area can be described as in ISO 1101. The datum feature
indicator may be placed directly on :
— the long dashed dotted wide line (in 2D) [see Figure 22 a) and Figure 22 g)];
— the reference line connected to a leader line pointing directly on the restricted area [for 2D, see
Figure 22 b), for 3D, see Figure 22 d) and Figure 22 e)];
— the surface or an extension line from the surface pointing indirectly on the restricted area with
the use of the ‘between’ symbol indication in the adjacent area [for 2D, see Figure 22 c), for 3D, see
Figure 22 f)];
— the tolerance frame for which its leader line shall point directly or indirectly on the restricted area;
— by indicating [ACS] above the tolerance frame [see Figure 23 a)] or after the datum letter symbol
in the tolerance frame [see Figure 23 c)], allowing the datum feature to be defined as any cross-
section of the integral feature (concurrently with the toleranced feature). When [ACS] is indicated
above the tolerance frame, the toleranced feature and the datum feature are established in the same
cross-section;
— by indicating [ALS] above the tolerance frame [see Figure 23 b)] or after the datum letter symbol in
the tolerance frame [see Figure 23 c)], allowing the datum feature to be defined as any longitudinal
section of the integral feature (concurrently with the toleranced feature). The datum feature is the
intersection of the real integral feature used to establish the datum and the section plane.
NOTE 1 See C.1.11.
a) b) c)
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SIST EN ISO 5459:2011/oprA1:2022
ISO 5459:2011/DAM 1:2022(E)
d) e) f)
g)
Figure 22 — Simplification of drawing indication when there is only one datum target area
16 Subclause 7.4.2.6
Replace the three first paragraphs by the following.
If the datum section frame has only one compartment, this one may contain:
— only a single datum ;
— a common datum used as the only datum [see Figures 32 a) and 32 b)] ;
— an indirect indication of a datum system, see Rule 11.
17 Subclause 7.4.2.9
In the first and in the second paragraphs, replace "CF, SL, PL or PT" by "CF, PT, SL, PL, SF or SV".
18 New subclause 7.4.2.11
Add the following new 7.4.2.11.
7.4.2.11 Rule 11 – Indication of a situation feature on the drawing
If a situation feature constituting a datum (single or common) or a datum system needs to be defined,
then it shall be represented and identified on the drawing.
NOTE 1 When a datum consists of only one situation feature [for example, axis of an associated cylinder,
median plane of two associated parallel opposite planes, median point (centre) of an associated sphere], it is not
necessary to include any additional indication to identify the situation feature: there is no alternative to define
the situation feature.
The representation of the situation feature on the drawing shall be made in accordance with Table 4.
Table 4 — Representation of situation features on a drawing
Situation feature Representation on the drawing
Point A wide cross (see Figure F.2).
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SIST EN ISO 5459:2011/oprA1:2022
ISO 5459:2011/DAM 1:2022(E)
TTaabblle 4 e 4 ((ccoonnttiinnueuedd))
Situation feature Representation on the drawing
A long-dashed double-dotted wide line (type 05.2 of ISO 128-2:2020).
Straight line
Or if viewed end-on a wide cross.
Four straight segments of the above type, forming a rectangle, representing the bor-
ders of a plane.
Plane
Or if viewed edge-on a long-dashed double-dotted wide line (type 05.2 of ISO 128-
2:2020).
NOTE 2 These situation features are the origins from which angular and linear TEDs, theoretically exact
features are defined.
The representation of the situation feature shall be connected with the situation feature identifier by a
leader line.
— When the leader line points on a point (projection of the situation straight line, or the situation
point), there is no terminator.
— When the leader line points on a straight line (a border of the representation of the situation plane,
or the situation straight line), the terminator is an arrow.
— When the leader line points on a planar surface (situation plane), the terminator is a full dot.
The situation feature identifier consists of a datum feature identifier followed, without a space, by a
situation feature type indicator. The datum feature identifier consists:
— for a single datum, of the single datum identifier ;
— for a common datum, of the common datum identifier placed between parenthesis ;
— for a datum system, of the datum system identifier, e.g. DS1.
The situation feature type indicator is either [PT] or [SL] or [PL] (respectively for a situation feature of
type point, straight line or plane).
EXAMPLE
— A[PT], A[SL], A[PL];
— (A-B)[PT], (A-B)[SL], (A-B)[PL];
— DS1[PT], DS1[SL], DS1[PL].
See Figure 42.
NOTE 3 In a 2D drawing, it may be necessary to show the same situation feature in several views to provide a
complete definition [see Figure 42 a)].
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SIST EN ISO 5459:2011/oprA1:2022
ISO 5459:2011/DAM 1:2022(E)
a) On a 2D representation
b) on a 3D representation
Figure 42 — Example of indication of the situation features constituting a datum established
from a complex integral surface
19 New subclause 7.4.2.12
Add the following new 7.4.2.12.
7.4.2.12 Rule 12 – Indirect indication of a datum system
A datum system may be indicated indirectly, by using a datum system identifier in the first compartment
of the datum section.
The datum system identifier consists of the symbol DS, optionally followed by an integer n.
The datum system, DSn, shall be defined in or near the title block as follows: a datum section, consisting
in one compartment, containing the datum system identifier, followed by an equal sign, followed by a
datum section, see ISO 1101:2017 (see example in Figure 43).
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SIST EN ISO 5459:2011/oprA1:2022
ISO 5459:2011/DAM 1:2022(E)
b) Indirect indication of a datum system by
a) Direct indication of a datum system
using a datum system identifier
Figure 43 — Example of direct and indirect indications of a datum system
20 New Clause 8
Add the following new Clause 8.
8 Specification operators for datum
8.1 ISO default specification operator for datum
Annex A defines the default association criteria and a basic approach for filtration.
8.2 Special specification operator for datum
8.2.1 General
When a special specification operator applies to establish a datum, it shall be indicated in the datum
section using the following ordered sequence of specification elements:
— the datum feature identifier, see 7.2.2;
— if necessary, the filtration indication, see 8.2.2;
— if necessary, the [PD], [MD] or [LD] modifier, see 7.4.2.1;
— if necessary, the [SV] or [SFx] modifier, see 7.4.2.2;
— if necessary, the [ACS] or [ALS] modifier, see 7.4.2.4;
— if necessary, the modifier [CF], see 7.4.2.5;
— if necessary, the association specification elements, see 8.2.3;
— if necessary, the modifier [DV], see 7.4.2.7;
— if necessary, the list of situation features to consider, see 7.4.2.8;
— if necessary, the orientation only modifier, see 7.4.2.8;
— if necessary, the modifier , see 7.4.2.10;
— if necessary, the modifier or , see 7.4.2.10.
An overview of the indications is given in Table 5. There shall be no space between specification
elements from different columns. Any default indication in the sequence can be omitted.
Specification elements for datums can also be used in an indirect indication of a datum system, see
7.4.2.12.
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SIST EN ISO 5459:2011/oprA1:2022
ISO 5459:2011/DAM 1:2022(E)
When a set of common datum identifiers enclosed in parentheses are followed by a set of specification
elements, the set of specification elements applies to all datum features establishing the common
datum.
Table 5 — Overview of the specification elements used in a datum section
Locked or re-
Filtration Datum feature leased degrees Geometrical modifiers
of freedom
A [W0,25×0,25] [PD] [SV] [ACS] [CF] [CM] [DV] [PL] ><
[CB1,5;W0,25×0,25] [MD] [SF] [ALS] [C–] [SL]
[LD] [SF14,2] [GE] [PT]
8.2.2 Filtration specification elements for datum
The filtration specification elements consist of the filter symbol, followed by the nesting index (see
ISO 16610 series). There shall be no space between the symbol and the nesting index.
When a morphological filter, e.g. a closing ball filter, is shown with a nesting index which corresponds
to the size of the structuring element, this is a long-wave pass filter. To be consist
...
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