oSIST prEN ISO 128-3:2022

Technical product documentation (TPD) - General principles of representation - Part 3: Views, sections and cuts (ISO/FDIS 128-3:2022)

This document specifies the general principles for presenting views, sections and cuts applicable to various kinds of technical drawings (e.g. mechanical, electrical, architectural, civil engineering), following the orthographic projection methods specified in ISO 5456-2. Views and sections for shipbuilding technical drawings are discussed in ISO 128-15. Views and sections for 3D models are discussed in ISO 16792.
Attention has also been given in this document to the requirements of reproduction, including microcopying in accordance with ISO 6428.

Technische Produktdokumentation (TPD) - Allgemeine Grundlagen der Darstellung - Teil 3: Ansichten, Schnitte und Schnittansichten (ISO 128-3:2022)

Dieses Dokument legt die allgemeinen Grundlagen zur Darstellung von Ansichten, Schnitten und Schnittansichten fest, die für verschiedene Arten von technischen Zeichnungen gelten (z. B. Mechanik, Elektrik, Architektur, Tiefbau), wobei die in ISO 5456 2 festgelegten orthogonalen Projektionsmethoden befolgt werden. Ansichten und Schnitte in Zeichnungen des Schiffbaus sind Gegenstand von ISO 128 15. Ansichten und Schnitte in 3D Modellen sind Gegenstand von ISO 16792.
Die Anforderungen an die Vervielfältigung, einschließlich Mikroverfilmung nach ISO 6428, wurden in diesem Dokument ebenfalls berücksichtigt.

Documentation technique de produits (TPD) - Principes généraux de représentation - Partie 3: Vues, sections et coupes (ISO/FDIS 128-3:2022)

Le présent document établit les principes généraux de représentation des vues, des sections et des coupes applicables aux différents types de dessins techniques (par exemple génie mécanique, génie électrique, génie architectural, génie civil) suivant les méthodes de projection orthographique, spécifiées dans l'ISO 5456-2. Les vues et sections pour les dessins techniques de construction navale sont discutées dans l’ISO 128-15. Les vues et sections pour les modèles 3D sont discutées dans l’ISO 16792.
Les spécifications du présent document ont été établies en tenant compte des exigences de reproduction, y compris celles de la micrographie, conformément à l'ISO 6428.

Tehnična dokumentacija izdelkov - Splošna načela prikazovanja - 3. del: Pogledi, prerezi in odrezi (ISO/FDIS 128-3:2022)

General Information

• Status: Not Published
• Public Enquiry End Date: 04-Aug-2022
• ICS: 01.110 - Technical product documentation
• Technical Committee: TRS - Technical drawings, quantities, units, symbols and graphical symbols
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 26-Sep-2022
• Due Date: 01-Dec-2022
• Ref Project: EN ISO 128-3:2022 - Technical product documentation (TPD) - General principles of representation - Part 3: Views, sections and cuts (ISO 128-3:2022)

RELATIONS

• Revised: SIST EN ISO 128-3:2020 - Technical product documentation - General principles of representation - Part 3: Views, sections and cuts (ISO 128-3:2020)
• Effective Date: 01-Jul-2022
• Replaces: SIST ISO 128-43:2016 - Technical product documentation (TPD) - General principles of presentation - Part 43: Projection methods in building drawings
• Effective Date: 24-Aug-2022
• Replaces: SIST EN ISO 128-3:2020 - Technical product documentation - General principles of representation - Part 3: Views, sections and cuts (ISO 128-3:2020)
• Effective Date: 21-Sep-2022

Standards Content (sample)

SLOVENSKI STANDARD
oSIST prEN ISO 128-3:2022
01-julij-2022
Tehnična dokumentacija izdelkov - Splošna načela prikazovanja - 3. del: Pogledi,
prerezi in odrezi (ISO/FDIS 128-3:2022)

Technical product documentation (TPD) - General principles of representation - Part 3:

Views, sections and cuts (ISO/FDIS 128-3:2022)

Technische Produktdokumentation (TPD) - Allgemeine Grundlagen der Darstellung - Teil

3: Ansichten, Schnitte und Schnittansichten (ISO 128-3:2022)

Documentation technique de produits (TPD) - Principes généraux de représentation -

Partie 3: Vues, sections et coupes (ISO/FDIS 128-3:2022)
Ta slovenski standard je istoveten z: prEN ISO 128-3
ICS:
01.110 Tehnična dokumentacija za Technical product
izdelke documentation
oSIST prEN ISO 128-3:2022 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN ISO 128-3:2022
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oSIST prEN ISO 128-3:2022
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 128-3
ISO/TC 10
Technical product documentation
Secretariat: SIS
(TPD) — General principles of
Voting begins on:
2022-04-19 representation —
Voting terminates on:
Part 3:
2022-07-12
Views, sections and cuts
Documentation technique de produits (TPD) — Principes généraux de
représentation —
Partie 3: Vues, sections et coupes
ISO/CEN PARALLEL PROCESSING
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 SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 128-3:2022(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. © ISO 2022
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oSIST prEN ISO 128-3:2022
ISO/FDIS 128-3:2022(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2022

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on

the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below

or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
© ISO 2022 – All rights reserved
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oSIST prEN ISO 128-3:2022
ISO/FDIS 128-3:2022(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction .................................................................................................................................................................................................................................v

1 S c op e ................................................................................................................................................................................................................................. 1

2 Nor m at i ve r ef er enc e s ..................................................................................................................................................................................... 1

3 Terms and definitions .................................................................................................................................................................................... 1

4 Basic conventions for views .....................................................................................................................................................................2

4.1 G eneral information on views................................................................................................................................................... 2

4.2 C hoice of views ....................................................................................................................................................................................... 3

4 . 3 P a r t i a l v iew s ............................................................................................................................................................................................. 3

4.4 S implified view of symmetrical parts ............................................................................................................................... 4

4.5 F irst-angle projection method .................................................................................................................................................. 4

4.6 F irst-angle projection method views .................................................................................................................................. 4

4.7 F irst-angle projection graphical symbol ......................................................................................................................... 5

4.8 Third-angle projection method ............................................................................................................................................... 5

4.9 T hird-angle projection method views ............................................................................................................................... 5

4.10 T hird-angle projection graphical symbol ....................................................................................................................... 6

4.11 O ther projection methods ............................................................................................................................................................ 6

4 .12 E n l a r g e d f e at u r e s ................................................................................................................................................................................. 6

5 Re ference indication for views and enlarged features ............................................................................................... 7

5 .1 G ener a l ........................................................................................................................................................................................................... 7

5.2 D etails of the reference indication ........................................................................................................................................ 7

5.3 E xamples of indication .................................................................................................................................................................... 8

6 G eneral information on cuts and sections ................................................................................................................................ 9

6 .1 G ener a l ........................................................................................................................................................................................................... 9

6.2 I ndication of cuts and sections ................................................................................................................................................. 9

6 . 2 .1 Cut t i n g pl a ne .......................................................................................................................................................................... 9

6.2.2 I dentification of the cutting plane ...................................................................................................................... 9

6.2.3 I dentification of the cuts and sections ............................................................................................................ 9

6.2.4 R eference indication for cuts and sections .............................................................................................. 10

6.3 S ections revolved in the relevant view .......................................................................................................................... 11

6.4 C uts/sections of symmetrical parts .................................................................................................................................12

6 . 5 L o c a l c ut s/s e c t ion s ..........................................................................................................................................................................12

7 B asic conventions for representing areas on cuts and sections ....................................................................13

7.1 G eneral information on cuts and sections .................................................................................................................. 13

7. 2 Hat c h i n g..................................................................................................................................................................................................... 13

7.3 S hading or toning .............................................................................................................................................................................. 14

7.4 E xtra-wide continuous outlines ........................................................................................................................................... 15

7. 5 T h i n s e c t ion s ......................................................................................................................................................................................... 15

7.6 T hin adjacent sections .................................................................................................................................................................. 15

7.7 S pecific materials .............................................................................................................................................................................. 16

Annex A (normative) Graphical symbols .....................................................................................................................................................17

Annex B (informative) Former practices .....................................................................................................................................................20

Annex C (normative) Views on mechanical engineering technical drawings ......................................................22

Annex D (normative) Sections on mechanical engineering technical drawings ...............................................34

Annex E (normative) Projection methods in building technical drawings .............................................................39

Annex F (normative) Representation of views, sections and cuts on construction drawings ............41

Bibliography .............................................................................................................................................................................................................................48

iii
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oSIST prEN ISO 128-3:2022
ISO/FDIS 128-3:2022(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 10, Technical product documentation, in

collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/SS

F01, Technical drawings, in accordance with the Agreement on technical cooperation between ISO and

CEN (Vienna Agreement).

This second edition cancels and replaces the first edition (ISO 128-3:2020), of which it constitutes a

minor revision. The changes are as follows:
— Clause 2: reference to ISO 10209 has been updated;

— Figures A.3, A.4, A.5, D.10, E.1 and E.2 have been redrawn to be consistent with the text;

— minor editorial changes.
A list of all parts in the ISO 128 series can be found on the ISO website.

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.
© ISO 2022 – All rights reserved
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oSIST prEN ISO 128-3:2022
ISO/FDIS 128-3:2022(E)
Introduction

This document contains generally applicable rules for the presentation of views, sections and cuts in all

kinds of technical product documentation. The first-angle projection method (formerly referred to as

method E) and the third-angle projection method (formerly referred to as method A) are described in

more detail in ISO 5456-2.

All figures in this document, excluding Figure 1, Figure 6 and Figure 7, have been drawn in first-angle

projection method unless other methods are stated. It should be understood that third-angle projection

or other methods could have been used equally well without prejudice to the principles established.

The application of views, sections and cuts within drawings of special technical fields varies

considerably. Therefore, rules of application specific to technical fields are given in Annexes A, B and C.

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oSIST prEN ISO 128-3:2022
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oSIST prEN ISO 128-3:2022
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 128-3:2022(E)
Technical product documentation (TPD) — General
principles of representation —
Part 3:
Views, sections and cuts
1 S cope

This document specifies the general principles for presenting views, sections and cuts applicable to

various kinds of technical drawings (e.g. mechanical, electrical, architectural, civil engineering),

following the orthographic projection methods specified in ISO 5456-2. Views and sections for

shipbuilding technical drawings are discussed in ISO 128-15. Views and sections for 3D models are

discussed in ISO 16792.

Attention has also been given in this document to the requirements of reproduction, including

microcopying in accordance with ISO 6428.
2 Normat ive references

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:—, Technical drawings — General principles of presentation — Part 2: Basic conventions for

lines

ISO 129-1, Technical product documentation (TPD) — Presentation of dimensions and tolerances — Part 1:

General principles

ISO 3098-1, Technical product documentation — Lettering — Part 1: General requirements

ISO 5456-2, Technical drawings — Projection methods — Part 2: Orthographic representations

ISO 6428, Technical drawings — Requirements for microcopying

ISO 10209:2022, Technical product documentation — Vocabulary — Terms relating to technical drawings,

product definition and related documentation

ISO 15519-1, Specification for diagrams for process industry — Part 1: General rules

ISO 81714-1, Design of graphical symbols for use in the technical documentation of products — Part 1:

Basic rules
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 10209:2022 and the following

apply.

ISO and IEC maintain terminology databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
1) Under preparation. Stage at the time of publication: ISO/FDIS 128-2:2022.
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oSIST prEN ISO 128-3:2022
ISO/FDIS 128-3:2022(E)
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
cut
sectional view
section (3.2) showing, in addition, outlines beyond the cutting plane

Note 1 to entry: While “cut” is generally used in the construction field, “section” is generally used in the

mechanical engineering field, regardless of the definitions in 3.1 or 3.2.
[SOURCE: ISO 10209:2022, 3.2.10, modified — Note 1 to entry added.]
3.2
section

representation showing only the outlines of an object lying in one or more cutting planes

Note 1 to entry: While “cut” is generally used in the construction field, “section” is generally used in the

mechanical engineering field, regardless of the definitions in 3.1 or 3.2.
[SOURCE: ISO 10209:2022, 3.2.58, modified — Note 1 to entry revised.]
3.3
technical drawing

drawing showing a technical installation, process or product with a view to clarifying its structure and

enabling its construction

Note 1 to entry: For the purpose of this document, the term “technical drawing” is interpreted in the broadest

possible sense, encompassing the total package of documentation specifying the product (work piece,

subassembly, assembly).
[SOURCE: ISO 5127:2017, 3.4.7.54, modified — Note 1 to entry replaced.]
4 Basic c onventions for views
4.1 Gener al information on views

The most informative view of an object shall be used as the principle view, taking into consideration, for

example, its functioning position, position of manufacturing or mounting.

Each view, with the exception of the front or principal figure (view, plan, principal figure), shall be

given clear identification with a capital letter, repeated near the reference arrow needed to indicate the

direction of viewing for the relevant view. Whatever the direction of viewing, the capital letter shall

always be positioned in normal relation to the direction of reading and be indicated either above or on

the right side of the reference arrow.

The reference arrow is defined in Annex A (for the former practice of arc arrow, see Annex B), as is the

lettering height of the identification.

The designated views may be located irrespective of the principal figure. The capital letters identifying

the referenced views shall be placed immediately above the relevant views (see Figure 1).

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oSIST prEN ISO 128-3:2022
ISO/FDIS 128-3:2022(E)
Figure 1 — Identification of referenced views

For applying views and sections to mechanical engineering technical drawings, Annex C and Annex D

shall apply. For applying projection methods in building technical drawings, Annex E shall apply. For

applying views, sections and cuts to construction technical drawings, Annex F shall apply.

4.2 Choic e of views

When views (including cuts and sections) are needed, these shall be selected according to the following

principles:

— limit the number of views (and cuts and sections) to the minimum necessary but sufficient to fully

delineate the object without ambiguity;
— avoid the need for hidden outlines and edges;
— avoid unnecessary repetition of a detail.
Views and sections for 3D models are given in ISO 16792.
4.3 Partial views

Features needing specific illustration, but not meriting a full view, can be illustrated using a partial view

limited by a continuous narrow line with zigzags of type 01.1 according to ISO 128-2:— (see Figure 2).

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oSIST prEN ISO 128-3:2022
ISO/FDIS 128-3:2022(E)
Figure 2 — Partial view
4.4 Simplified view of symmetrical parts

To save time and space, symmetrical objects can be drawn as a fraction of the whole [see Figure 3 a), b)

and c)].

The line of symmetry is identified at each of its ends by two narrow short parallel lines drawn at right

angles to it [see Figure 3 a), b) and c)]. The graphical symbol for symmetry shall be drawn in accordance

with A.3.
a) Example 1 b) Example 2 c) Example 3
Figure 3 — Examples of simplified views of symmetrical parts
4.5 First-ang le projection method

The first-angle projection method, if used, shall be in accordance with ISO 5456-2.

4.6 First-ang le projection method views

With reference to the front view, (a), the other views are arranged as follows (see Figure 4):

— the view from above, (b), is placed underneath;
— the view from below, (e), is placed above;
— the view from the left, (c), is placed on the right;
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oSIST prEN ISO 128-3:2022
ISO/FDIS 128-3:2022(E)
— the view from the right, (d), is placed on the left;

— the view from the rear, (f), may be placed on the left or right, as convenient.

Figure 4 — First-angle projection method
4.7 First-ang le projection graphical symbol

The graphical symbol for the first angle projection method is shown in Figure 5. The proportions and

dimensions of this graphical symbol are specified in ISO 5456-2.
Figure 5 — First angle projection graphical symbol
4.8 Thir d-angle projection method

The third-angle projection method, if used, shall be in accordance with ISO 5456-2.

4.9 Thir d-angle projection method views

With reference to the front view, (a), the other views are arranged as follows (see Figure 6):

— the view from above, (b), is placed above;
— the view from below, (e), is placed underneath;
— the view from the left, (c), is placed on the left;
— the view from the right, (d), is placed on the right;

— the view from the rear, (f), may be placed on the left or right, as convenient.

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oSIST prEN ISO 128-3:2022
ISO/FDIS 128-3:2022(E)
Figure 6 — Third-angle projection method
4.10 Thir d-angle projection graphical symbol

The graphical symbol for the third-angle projection method is shown in Figure 7. The proportions and

dimensions of this graphical symbol are specified in ISO 5456-2.
Figure 7 — Third-angle projection graphical symbol
4.11 Other pr ojection methods

Refer to ISO 5456-2 for information on other projection methods, such as mirrored orthographic

projections.
4.12 Enlarged features

When the scale of a technical drawing does not allow all features to be clearly shown or dimensioned,

the unclear features shall be enclosed or encircled by a continuous narrow line (type 01.1), with the

area thus enclosed identified by a capital letter. The features in the area shall also be shown on an

enlarged scale, in a view that is broken with a continuous narrow freehand or free-formed curve line

(type 01.1). This shall be accompanied by the identification letter and an indication of the scale beside

it between parentheses, as shown in Figure 8. The rules for lettering height are discussed in Annex A.

Figure 8 — Enlarged features
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oSIST prEN ISO 128-3:2022
ISO/FDIS 128-3:2022(E)

For unambiguous relation between the circle and the identification letter, a leader line by a continuous

narrow line (type 01.1) and a reference line by a continuous narrow line (type 01.1) should be drawn.

See Figure 9.
Figure 9 — Enlarged features with leader line
5 R eference indication for views and enlarged features
5.1 General

On large-format mechanical technical drawings and technical drawings consisting of more than one

drawing sheet with an extensive amount of views and enlarged features, the readability should be

improved by information (reference indication) after the identification letter of the views.

The purpose is to find the views and the identification letters more easily on the technical drawing or

drawings.

On construction drawings, designations for views and enlarged features can be complemented by

general reference to other drawings containing the views or features.
5.2 Details of the r eference indication

The reference indication after the identification letter on the views shall be in accordance with

ISO 15519-1.
Examples with explanation are shown in Figure 10 and Figure 11.
Figure 10 — Details of the reference indication with a single drawing
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oSIST prEN ISO 128-3:2022
ISO/FDIS 128-3:2022(E)
Figure 11 — Details of the reference indication with multiple drawings
5.3 Ex amples of indication
Examples of indication are given in Table 1.
Table 1 — Examples of indication
Indication on technical drawing Interpretation
View A is represented at technical drawing
coordinates C10 on the same sheet.
The identification letter and reference arrow on the
main view is represented at technical drawing
coordinates A3 on the same sheet.
Enlarged feature Z is represented at technical drawing
coordinates D5 on sheet 2.
The indication of the enlarged feature Z is represented
at technical drawing coordinates B3 on sheet 1.
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oSIST prEN ISO 128-3:2022
ISO/FDIS 128-3:2022(E)
6 Gener al information on cuts and sections
6.1 General

The general rules for the arrangement of views apply equally when drawing cuts and sections.

6.2 Indication of cuts a nd sections
6.2.1 Cutting plane

The position of the cutting plane(s) shall be indicated by means of a cutting line represented with a

dashed dotted wide line (type 10.2) according to ISO 128-2:—, Annex E and Annex G. A straight cutting

plane shall be drawn (see Figure 12).

If the cutting plane changes its direction, the cutting line should only be drawn at the ends of the cutting

plane, where the cutting plane changes direction (see Figure 13).

If necessary for its legibility, the cutting line may be connected with a long-dashed dotted narrow line

of the type 04.1 according to ISO 128-2:—, Annex D or 04.1 according to ISO 128-2:—, Annex F.

The direction of viewing for the relevant cut and section is indicated by the reference arrows as defined

in Annex A.

The designated cut and section can be located irrespective of the view in which the cutting plane is

taken.
Representation of areas on cuts and sections is covered in Clause 7.
6.2.2 Identification of the cutting plane

Each cut and section plane shall be given clear identification with twice the same capital letter, once at

each of the cut and section arrows. This identification should be positioned for reading from the bottom

of the technical drawing.

The 30° or 90° cut and section arrow is defined in A.4, as is the lettering height of the identification.

6.2.3 Identification of the cuts and sections

The identification of the referenced cuts and sections shall be placed immediately above the relevant

representation. (see Figure 12 and 13).
Figure 12 — Example from construction field
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oSIST prEN ISO 128-3:2022
ISO/FDIS 128-3:2022(E)
Figure 13 — Example from mechanical engineering field
6.2.4 Reference indication for cuts and sections
6.2.4.1 General

On large-format technical drawings and technical drawings consisting of more than one drawing sheet

with an extensive number of cuts and sections, the readability should be improved by information

(reference indication) after the identification letter of the cutting plane and the identification letters of

the referenced cuts and sections.

The purpose is to find the cuts and sections and the identification letters more easily on the technical

drawing or drawings.
The cut and section arrows shall be drawn in accordance with A.5.
6.2.4.2 Details of the reference indication
The reference indication after the identification letter o
...