ISO 16792:2015

DRAFT INTERNATIONAL STANDARD ISO/DIS 16792
ISO/TC 10 Secretariat: SIS
Voting begins on Voting terminates on

2012-11-01 2013-04-01
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION  •  МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ  •  ORGANISATION INTERNATIONALE DE NORMALISATION

Technical product documentation — Digital product definition
data practices
Documentation technique de produits — Données de définition d'un produit
[Revision of first edition (ISO 16792:2006)]
ICS 01.110; 35.240.10
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This draft has been developed within the International Organization for Standardization (ISO), and
processed under the ISO-lead mode of collaboration as defined in the Vienna Agreement.
This draft is hereby submitted to the ISO member bodies and to the CEN member bodies for a parallel
five-month enquiry.
Should this draft be accepted, a final draft, established on the basis of comments received, will be
submitted to a parallel two-month approval vote in ISO and formal vote in CEN.

To expedite distribution, this document is circulated as received from the committee
secretariat. ISO Central Secretariat work of editing and text composition will be undertaken at
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Secrétariat central de l'ISO au stade de publication.

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REFERRED TO AS AN INTERNATIONAL STANDARD UNTIL PUBLISHED AS SUCH.
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©  International Organization for Standardization, 2012

ISO/DIS 16792
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ii © ISO 2012 – All rights reserved

ISO/DIS 16792
Contents Page
Foreword .vi
Introduction.vii
1 Scope.1
2 Normative references.1
3 Terms and definitions .2
4 Data set identification and control .2
4.1 General .2
4.2 Related data .3
4.3 Data management.3
5 Data set requirements.4
5.1 General .4
5.1.1 Fundamental requirements .4
5.1.2 Design model requirement .5
5.2 General model requirements.5
5.2.1 Associativity .5
5.2.2 Model coordinate systems .6
5.2.3 Applications of supplemental geometry.7
5.2.4 Workpiece features not fully modelled .8
5.3 General method requirements .8
5.3.1 Data set methods.8
5.3.2 Model-only.8
5.3.3 Model and drawing.9
5.4 Management data .9
5.4.1 General .9
5.4.2 Management data in the data set.9
5.4.3 Management data on a model .10
5.5 Protection marking.10
5.5.1 General .10
5.5.2 Location on models.10
5.6 Views on models .10
6 Design model requirements .13
6.1 General .13
6.2 Geometric scale, units and precision.13
6.3 Model completeness .13
6.4 Assembly model completeness.13
6.5 Installation model completeness.14
7 Common requirements for product definition data .14
7.1 General .14
7.2 Common requirements .14
7.2.1 Display management.14
7.2.2 Screen dump.16
7.3 Model requirements .16
7.3.1 General .16
7.3.2 Associativity .17
7.3.3 Attributes.19
7.3.4 Annotation planes .20
7.3.5 Leader lines.21
7.3.6 Direction dependent tolerances.21
ISO/DIS 16792
7.3.7 Indicating limited application of a tolerance. 22
7.3.8 Query types . 22
7.4 Drawing requirements. 26
7.4.1 General. 26
7.4.2 Orthographic views . 27
7.4.3 Axonometric views . 27
8 Notes and special notations. 30
8.1 Common requirements . 30
8.1.3 Flagnote . 30
8.2 Model requirements. 30
8.3 Drawing requirements. 31
9 Model values and dimensions. 31
9.1 General. 31
9.2 Common requirements . 31
9.2.1 Model value queries . 31
9.2.2 Resolved dimensions. 31
9.2.3 Plus and minus tolerances . 32
9.3 Model requirements. 32
9.3.1 General. 32
9.3.2 Theoretically exact and nominal dimensions. 32
9.3.3 Size values. 33
9.3.4 Coded size tolerances. 34
9.3.5 General applications of plus and minus tolerances . 34
9.3.6 Chamfers . 34
9.3.7 Depth specification. 38
9.4 Drawing requirements. 41
10 Datum applications. 41
10.1 General. 41
10.2 Common requirements . 41
10.3 Model requirements. 41
10.3.1 Datum systems and model coordinate systems . 41
10.3.2 Identification of datums . 43
10.3.3 Associativity of datum features and design data. 46
10.3.4 Datum target identification and attachment . 46
10.3.5 Multiple features establishing a datum . 48
10.4 Drawing requirements. 55
11 Geometric tolerances . 55
11.1 General. 55
11.2 Common requirements . 55
11.3 Model requirements. 56
11.3.1 General. 56
11.3.2 Form tolerances. 56
11.3.3 Orientation tolerances. 62
11.3.4 Profile tolerances. 69
11.3.5 Location tolerances. 76
11.3.6 Runout tolerances . 82
11.4 Drawing requirements. 87
11.4.1 General. 87
11.4.2 Requirements applicable to all geometric tolerances . 88
11.4.3 Form tolerances. 88
11.4.4 Orientation tolerances. 91
11.4.5 Profile tolerances. 91
11.4.6 Position tolerances. 93
11.4.7 Runout tolerances on a drawing. 93
12 Welds. 93
12.1 General. 93
12.2 Common requirements . 93
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ISO/DIS 16792
12.2.1 Application of supplemental geometry.93
12.2.2 Arrow lines .93
12.3 Model requirements .94
12.3.1 Annotation plane .94
12.3.2 Associativity .94
12.3.3 Indicating extents of the weld .94
12.3.4 Query of weld path .95
12.4 Drawing requirements.96
13 Surface Texture .96
13.1 General.96
13.2 Common requirements .96
13.3 Model requirements .96
13.3.1 Display Techniques.96
13.3.2 Annotation plane .98
13.3.3 Associativity .98
13.3.4 Indication of direction of lay .98
13.3.5 Use of all around indication .99
13.4 Drawing requirements.100
Annex A (informative) Classification codes for drawings and data sets .101
A.1 General.101
A.2 Application.101
A.3 Definitions .101
A.4 Classification code requirements.102
A.4.1 General.102
A.4.2 Classification code location.102
A.4.3 Approval indicators.102
A.4.4 Classification code 1.102
A.4.5 Classification code 2.102
A.4.6 Classification code 3.103
A.4.7 Classification code 4.103
A.4.8 Classification code 5.103
Bibliography.104

ISO/DIS 16792
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 16792 was prepared by Technical Committee ISO/TC 10, Technical product documentation.
This second edition cancels and replaces the first edition (ISO 167925:2006), which has been technically
revised mainly to incorporate the technical changes in ISO 1101:2012 and ISO 5459:2011. Clause 12 on
indication for welds and Clause 13 on indications for surface texture have been added. A new informative
Annex on classification codes has also been added.
vi © ISO 2012 – All rights reserved

ISO/DIS 16792
Introduction
Every effort was made during the preparation of this International Standard — adapted from
ASME Y14.41:2003 — to apply existing requirements developed for two-dimensional (2-D) presentation
equally to the output from three-dimensional (3-D) models. Where new Geometrical Product Specification
(GPS) rules have proved essential, these have been drafted with a view to their being equally applicable to
both 2-D and 3-D. Therefore, in order to maintain the integrity of a single system, these new rules are being
incorporated in the relevant existing ISO standards for cross-reference. Application examples have been
included where, due to the specific requirements of 3-D modelling, additional guidance was deemed beneficial.
It is recognised that there is a need to support drawings in conjunction with 3 D models now and for the
foreseeable future. This need has been addressed in this International Standard through the definition of the
two methods for documenting digital models and specification of requirements to ensure that the information
in a data set is consistent between the model and the drawing.
The figures in this International Standard are intended only as illustrations to aid the user in understanding the
practices elaborated in the text. In some cases, figures show a level of detail as needed for emphasis; in
others, they are only complete enough to illustrate a concept or facet thereof. The absence of figures has no
bearing on the applicability of the specified requirement or practice.
In order to comply with the requirements of this International Standard, actual data sets will need to meet the
content requirements set forth in its text.
Most figures are illustrations of models in a 3-D environment. Figures illustrating drawings in digital format
include a border.
Text in uppercase letters used in the figures are intended to appear in digital product definition data, or data
sets; while that in lowercase letters is for information only and is not intended to appear in data sets.
DRAFT INTERNATIONAL STANDARD ISO/DIS 16792

Technical product documentation — Digital product definition
data practices
1 Scope
This International Standard specifies requirements for the preparation, revision and presentation of digital
product definition data, hereafter referred to as data sets. It supports two methods of application: model-only,
and model and drawing in digital format. Its structure presents requirements common to both methods
followed by clauses providing for any essential, differing requirements for each method. Additionally, its use in
conjunction with computer aided design (CAD) systems could assist in the progression towards improved
modelling and annotation practices for CAD and engineering disciplines, as well as serving as a guideline for
IT engineers.
The aspects specified in this International Standard refer mainly, but not exclusively, to requirements that
differ or are additional to those provided in existing, related standards. Where no such requirements are
identified, it is safe to assume that the appropriate existing ISO standards are instead applicable.
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 (all parts), Technical drawings — General principles of presentation
ISO 129-1:2004, Technical drawings — Indication of dimensions and tolerances — Part 1: General principles
ISO 286 (all parts), ISO system of limits and fits
ISO 1101:2012, Geometrical Product Specifications (GPS) — Geometrical tolerancing — Tolerances of form,
orientation, location and run-out
ISO 1302, Geometrical Product Specifications (GPS) — Indication of surface texture in technical product
documentation
ISO 2553, Welded, brazed and soldered joints — Symbolic representation on drawings
ISO 2768-1:1989, General tolerances — Part 1: Tolerances for linear and angular dimensions without
individual tolerance indications
ISO 3098-0:1997, Technical product documentation — Lettering — Part 0: General requirements
ISO 3098-5:1997, Technical product documentation — Lettering — Part 5: CAD lettering of the Latin alphabet,
numerals and marks
ISO 5456 (all parts), Technical drawings — Projection methods
ISO 5457:1999, Technical product documentation — Sizes and layout of drawing sheets
ISO/DIS 16792
ISO 5459:2011 Geometrical product specifications (GPS) – Geometrical tolerancing – Datums and datum
ISO 7200:2004, Technical product documentation — Data fields in title blocks and document headers
ISO 8015, Geometrical product specifications (GPS) -- Fundamentals -- Concepts, principles and rules
ISO 11442:2006, Technical product documentation — Document management
ISO 14660-1:1999, Geometrical Product Specifications (GPS) — Geometrical features — Part 1: General
terms and definitions
ISO 16016 Technical product documentation — Protection notices for restricting the use of documents and
products
ISO 80000-1, Quantities and units — Part 1: General
IEC 82045-2:2004, Document management — Part 2: Metadata elements and information reference model
3 Terms and definitions
For the purposes of this International Standard, the terms and definitions in ISO 10209:2012 and the following
apply.
3.1
absolute coordinate system
primary model coordinate system in the CAD model used to define the location of digital elements in the CAD
model
3.2
datum system
set of two or more situation features established in a specific order from two or more datum features
NOTE To define a datum system, it is necessary to consider the collection surface created by the considered datum
features. The invariance class of a collection surface can be complex, prismatic, helical, cylindrical, revolute, planar or
spherical (see Table B.1).
[ISO 5459:2011, 3.10]
3.3
user defined coordinate system
model coordinate system which is created in the CAD model in addition to the absolute coordinate system
4 Data set identification and control
4.1 General
Data sets for which compliance with this International Standard is claimed shall include a reference to this
International Standard, ISO 16792, either in the data set itself or in a document referenced by the data set.
The current revision of the data and the computer application(s) and version(s) used to develop the data set
shall be specified with other management data, see 5.4.
The data set identifier shall be unique and shall consist of numeric, alphabetic or special characters in any
combination. Spaces are not permitted between any of the characters of the data set identifier.
The length of the data set identifier may be a direct function of the computer system and the operating system.
When the part or identifying number is used as the data set identifier, the length shall be compatible with
recognised limitations on number length in accordance with ISO 7200 and IEC 82045-2.
2 © ISO 2012 – All rights reserved

ISO/DIS 16792
Special characters, such as hyphen (-), slash (/), or asterisk (*), shall be selected in a manner that does not
hinder data set identification or have an adverse affect on the computer system operation.
A recognisable prefix or suffix may be included as part of the identifier to associate files and sets of related
data.
See ISO 7200 and IEC 82045-2 for the description and use of drawings, drawing numbers, and identifying
numbers.
4.2 Related data
Related data shall be integral to, or referenced in, the data set. Related data consists of, but is not limited to,
analytical data, parts lists, test requirements, material specifications, process and finish requirements in
accordance with Figure 1.
4.3 Data management
The following specifies the structure and control requirements for data management:
a) The data management system shall meet the requirements of ISO 11442, providing information to enable
the control and tracking of data sets, throughout the life cycle of the product to which each relates. The
system may include work in process, data review status, model checked status, release status, design
tool and version, libraries, etc.
b) Revision history information per ISO 11442 shall be contained in the data set.

Key
a
Related data (as applicable) required for complete definition may be integral to or referenced in the product definition
data set. Data not integral to the product definition data set may be revised independently.
b
A drawing is not required for Model Only data sets.
c
Related data may be manually or computer generated.
ISO/DIS 16792
Figure 1 — Content of a product definition data set

Figure 2 — Content of a model
5 Data set requirements
5.1 General
The data set shall provide complete product definition. For example, a design model, its annotation, and
related documentation.
5.1.1 Fundamental requirements
The following are the fundamental requirements and other provisions applicable to both annotated models and
drawings, specific to annotated models and specific to drawings.
c) Common to annotated models and drawings
⎯ All model values and resolved dimensions shall be obtained from the model.
⎯ Rounding requirements for resolved dimensions shall comply with 9.2.2.
⎯ The ability to query the model shall be available, see 7.3.8.
⎯ All angular values shall be queried from the model, see 9.3. Exceptions to this are model coordinate
system(s), planes and axes in a datum system, and orthographic views.
⎯ When query is required, a notation stating the requirement for query of the model or associated data
shall be added to the drawing or in the general notes.
⎯ When applying tolerances to features, alignment of the annotation plane to the nominal or
theoretically exact profile is not required.
⎯ Values obtained from the model for any feature(s) without any tolerance or datum target
specifications assigned shall be auxiliary dimensions.
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ISO/DIS 16792
⎯ Legibility requirements of ISO 3098-0 and ISO 3098-5 shall apply when the annotation is viewed
perpendicular to the annotation plane.
⎯ Annotation in any given annotation plane shall not overlap other annotation in the same annotation
plane when the model is viewed perpendicular to the annotation plane.
⎯ Annotation text within any given annotation plane shall not be placed over the design model when
the model is viewed perpendicular to the annotation plane.
d) Applicable only to models
⎯ All annotation shall be specified in one or more annotation planes. When CAD software does not
support maintenance of annotation plane orientation relative to the model, the model-only method
shall not be used, see 7.3.4.
⎯ The associated entities, annotation, and attributes shall be in agreement, see 7.3.2.
⎯ Resolved dimensions created from queried model values are considered the same as dimensions
displayed on a model, see 9.2.1.
⎯ Display of centrelines or centre planes for features of size is optional.
⎯ To ensure that the annotation is readable — the text, for example, could be upside down or
backwards following rotation of the model — one of the following techniques shall be used:
i) ensuring that the reading direction is updated after rotation of a model;
ii) inclusion of means of determining the correct reading direction in each annotation plane applied
to a model;
iii) when using saved views, ensuring that the model is orientated in the intended view direction —
for example, by including a means of determining the correct reading direction in the view.
⎯ Dimensions and tolerances to internal features may be shown without the use of a section, see
Figure 26 c).
e) Applicable only to drawings
⎯ Annotation may be applied to orthographic or axonometric views.
⎯ For axonometric views, the orientation of the annotation shall be parallel to, normal to or coincident
with the surface to which it applies. An annotation shall not overlap another or the geometrical
representation of the part.
5.1.2 Design model requirement
A design model is required and shall be in accordance with 5.2 and Clause 6.
5.2 General model requirements
5.2.1 Associativity
The ability to associate digital elements shall be available and maintained. Associativity information shall be
electronically accessible.
ISO/DIS 16792
5.2.2 Model coordinate systems
A design model shall contain one or more model coordinate systems. A model coordinate system shall be
depicted by three mutually perpendicular line segments with its origin located at the intersection of the three
axes. Each axis shall be labelled and the positive direction shown. Model coordinate systems shall be right-
handed unless otherwise specified, see Figure 3 b).
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ISO/DIS 16792
a)  Mirror-image relationship

NOTE When observed in the Z direction, with positive Y ascending, positive X is directed to the right-hand side of the
observer.
b)  Recognising the right-hand coordinate system
Figure 3 — Left- and right-hand model coordinate systems
5.2.3 Applications of supplemental geometry
When supplemental geometry is used, there shall be a clear distinction between the supplemental geometry
and the model geometry.
ISO/DIS 16792
a) Represented line element
When a represented line element is used to indicate the direction of a geometric tolerance application, the
leader line from the tolerance indicator shall terminate on the represented line element in an arrowhead,
see Figure 42. The following geometric tolerances may use a represented line element to clarify the
directionality of a two-dimensional tolerance zone of parallel lines:
⎯ straightness applied to the line elements of a planar surface, see 11.3.2 and Figure 42;
⎯ orientation tolerance applied on each line element on a surface, see 11.3.3 and Figure 48.
⎯ profile any line, see 11.3.4 and Figure 57.
NOTE It may be necessary to carefully define the placement and orientation of the represented line element on the
real workpiece.
b) Associativity
The represented line element, the tolerance indicator and, the toleranced model feature should be
organized as an associated group, see Figures 42, 48, and 57.
5.2.4 Workpiece features not fully modelled
A conventional simplified representation of workpiece features such as threads, holes, fillets, rounds and
drafts may be shown using partial geometry definition, annotations, attributes or a combination thereof, see
Figure 10.
5.3 General method requirements
5.3.1 Data set methods
The following subclauses cover the product definition methods listed below. Each different method for
specifying product definition is used in support of different industry processes and requirements. The data set
is the original for all of the methods: any copy, no matter what the media of presentation, is subordinate.
5.3.2 Model-only
The following is applicable when there is complete product definition within a model.
a) Product definition data, including but not limited to notes, parts lists, marking requirements, dimensions
and, tolerances shall be contained or referenced in the data set.
b) The data elements of a drawing format as defined in ISO 5457 and ISO 7200 are not required, except for
the following, which shall be contained in the data set:
⎯ legal owner for the data set;
⎯ data set title;
⎯ data set number;
⎯ approval indicators and approval dates;
⎯ contract number when required;
⎯ originator’s name and date.
c) When working with a model, the first or third angle projection symbol (see ISO 5456-2) is not required.
8 © ISO 2012 – All rights reserved

ISO/DIS 16792
5.3.3 Model and drawing
The following is applicable when there is complete product definition within a model and drawing.
a) A complete definition of a product shall contain a model and a drawing that may contain orthographic
views, axonometric views or a combination thereof. Annotation may be applied to the model, or on the
drawing or, a combination thereof.
NOTE The development of a drawing that provides a complete product definition is allowed.
b) Product definition data created or shown in the model and on the drawing shall not be in conflict.
c) Product definition data created and shown on the drawing shall not conflict with product definition data in
the model.
d) The drawing shall contain a drawing border and title block information in accordance with ISO 5457 and
ISO 7200.
e) The drawing shall reference all models and data relevant to the product.
f) Annotation displayed on the drawing shall be interpretable without the use of query.
g) When complete product definition is not contained on the drawing, this shall be noted.
h) When complete product definition is not contained in the model, this shall be noted.
5.4 Management data
5.4.1 General
Management data that is not placed on a drawing shall be placed on the model or in the data set separate
from the model or drawing according to 5.4.2 and 5.4.3.
5.4.2 Management data in the data set
The following management data shall be contained in the data set:
⎯ Application data;
⎯ Approval;
⎯ Data set identification;
⎯ Design activity transfer;
⎯ Revision history for the data set.
ISO/DIS 16792
5.4.3 Management data on a model
Management data placed on a model shall be placed on a management data annotation plane or using an
equivalent method. The annotation plane shall be available for display with the model. When displayed, the
management data annotation plane shall not rotate with the model. Management data placed on a model shall
include, but is not limited to
⎯ ISO 16792,
⎯ CAD maintained notation,
⎯ design activity identification,
⎯ duplicate original notation,
⎯ ite
...