ISO/FDIS 8062-4

Geometrical product specifications (GPS) — Dimensional and geometrical tolerances for moulded parts — Part 4: Rules and general tolerances for castings using profile tolerancing in a general datum system

Spécification géométrique des produits (GPS) — Tolérances dimensionnelles et géométriques pour les pièces moulées — Partie 4: Tolérances générales pour les pièces moulées par tolérancement de profil dans un système général de références spécifiées

General Information

• Status: Not Published
• ICS: 17.040.10 - Limits and fits
• Technical Committee: ISO/TC 213 - Dimensional and geometrical product specifications and verification
• Drafting Committee: ISO/TC 213/WG 9 - Dimensional and geometrical tolerancing for castings
• Current Stage: 5020 - FDIS ballot initiated: 2 months. Proof sent to secretariat
• Start Date: 30-Jan-2023
• Completion Date: 30-Jan-2023

Relations

• Revises: ISO 8062-4:2017 - Geometrical product specifications (GPS) — Dimensional and geometrical tolerances for moulded parts — Part 4: General tolerances for castings using profile tolerancing in a general datum system
• Effective Date: 23-Apr-2020

Standards Content (Sample)

Date: 2022-09-22 2023-01-13
ISO/FDIS 8062--4:2022 2023(E)
ISO/TC 213/WG 9
Secretariat: BSI
Geometrical product specifications — Dimensional and geometrical tolerances
for moulded parts — Part 4: Rules and general tolerances for castings using
profile tolerancing in a general datum system
Spécification géométrique des produits (GPS) — Tolérances dimensionnelles et

géométriques pour les pièces moulées — Partie 4: Tolérances générales pour les pièces

moulées par tolérancement de profil dans un système général de références spécifiées

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ISO/FDIS 8062-4:2023(E)

All rights reserved. Unless otherwise specified, 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
Ch. de Blandonnet 8 •• CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
[e-mail]
www.iso.org
www.iso.org
ii © ISO 2023 – All rights reserved
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ISO/FDIS 8062-4:2023(E)
Contents Page

Foreword ....................................................................................................................................................................... v

1 Scope ................................................................................................................................................................ 1

2 Normative references ................................................................................................................................ 1

3 Terms and definitions ................................................................................................................................ 2

4 Graphical symbols ....................................................................................................................................... 6

5 Product definition type indicator ........................................................................................................... 7

5.1 Single and combined product definitions ............................................................................................ 7

5.2 Final moulded part product definitions ............................................................................................... 8

5.3 Intermediate machined moulded part product definitions .......................................................... 8

5.4 Final machined moulded part product definition ............................................................................ 8

5.5 Identifier for machining by the supplier .............................................................................................. 9

6 Product definition indications ................................................................................................................ 9

6.1 Surface texture symbols ............................................................................................................................ 9

6.2 Part condition identifiers ....................................................................................................................... 10

6.2.1 General .......................................................................................................................................................... 10

6.2.2 Surface texture ........................................................................................................................................... 10

6.2.3 Linear sizes .................................................................................................................................................. 12

6.2.4 Linear dimensions and individually indicated dimensional tolerances ................................. 12

6.2.5 Theoretically exact dimensions (TEDs) ............................................................................................. 12

6.2.6 Geometrical tolerances and datums .................................................................................................... 13

6.3 Required machining allowance (RMA) ............................................................................................... 15

6.3.1 General .......................................................................................................................................................... 15

6.3.2 General RMA................................................................................................................................................ 15

6.3.3 Individual RMA ........................................................................................................................................... 15

6.4 Draft angles ................................................................................................................................................. 15

7 Indication of general tolerances ........................................................................................................... 19

7.1 General tolerances according to this document .............................................................................. 19

7.2 General surface profile tolerance ......................................................................................................... 20

8 Types of specifications ............................................................................................................................. 20

8.1 General .......................................................................................................................................................... 20

8.2 Specification of final moulded part condition .................................................................................. 20

8.2.1 Overview of specification of final moulded part condition .......................................................... 20

8.2.2 Specification of final moulded part condition by the casting calculation method ............... 20

8.2.3 Specification of final moulded part condition by the multiple tolerancing method ............ 21

8.3 Specification of intermediate machined moulded part conditions ........................................... 21

8.4 Specification of final machined moulded part condition .............................................................. 22

9 Tolerancing ................................................................................................................................................. 22

9.1 General .......................................................................................................................................................... 22

9.2 Tolerancing of final moulded parts ..................................................................................................... 23

9.2.1 Recommendations .................................................................................................................................... 23

9.2.2 Drafts ............................................................................................................................................................. 23

9.3 Tolerancing of intermediate machined moulded parts ................................................................ 23

9.4 Tolerancing of final machined moulded parts ................................................................................. 23

9.4.1 General .......................................................................................................................................................... 23

9.4.2 Drafts ............................................................................................................................................................. 24

9.4.3 Multiple tolerancing method ................................................................................................................. 24

10 Rules .............................................................................................................................................................. 24

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ISO/FDIS 8062-4:2023(E)

10.1 Rule A: Application of general tolerances for castings .................................................................. 24

10.2 Rule B: General surface profile tolerances ........................................................................................ 25

10.3 Rule C: General datum system RST ...................................................................................................... 25

10.4 Rule D: Tolerances overruling the general surface profile tolerances .................................... 25

10.5 Rule E: Additional tolerances ................................................................................................................. 26

10.6 Rule F: Machined condition .................................................................................................................... 26

10.7 Rule G: Required machining allowances (RMA) .............................................................................. 26

10.8 Rule H: Draft angle (taper) ..................................................................................................................... 27

10.9 Rule I: Wall thickness ............................................................................................................................... 27

11 General tolerances .................................................................................................................................... 27

12 Required machining allowances (RMAs) ........................................................................................... 29

13 Draft angles .................................................................................................................................................. 30

14 General product definition indication ................................................................................................ 32

Annex A (normative) Proportions and dimensions of graphical symbols ........................................... 34

Annex B (informative) Proposed process for general tolerancing castings ........................................ 36

Annex C (informative) Examples for the multiple tolerancing method ................................................ 37

Annex D (informative) Drawing examples ..................................................................................................... 42

Annex E (informative) Selection of general tolerances .............................................................................. 54

Annex F (informative) Selection of required machining allowances (RMA) ....................................... 55

Annex G (informative) Example of using general tolerances ................................................................... 56

Annex H (normative) Calculation of the nominal dimension of the moulded

condition — casting calculation method ............................................................................................ 62

Annex I (informative) Relationship to the GPS matrix model .................................................................. 67

Bibliography .............................................................................................................................................................. 69

iv © ISO 2023 – All rights reserved
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ISO/FDIS 8062-4:2023(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.

This second edition cancels and replaces the first edition (ISO 8062-4:2017), which has been technically

revised.
The main changes to the previous edition are as follows:

— overall clarification regarding better applicability according to the ISO GPS system;

— overall revision of tables and figures for plausibility;

— new symbols for draft angles with symmetrical/unsymmetrical tolerance zones as already included

in the model geometry or drawing outlines have been added;

— requirements for the indication in the product definition (new Clauses 5, 6 and 7),) and types of

specifications (new Clause 8) have been added;
— Rule I concerning the wall thickness has been added;

— Clause 9 "Tolerancing" and informative Annex G "Example of using general tolerances" hashave been

added, expanding the information previously given in former informative Annex A "Concept of

general tolerancing";;

— The — new normative Annex A "Proportions and dimensions of graphical symbols" has been added;

© ISO 2023 – All rights reserved v
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ISO/FDIS 8062-4:2023(E)

New informative Annexes A, B "Proposed process of general tolerancing castings" and C "Examples for

the multiple tolerancing method" have been added;
A list of all parts in the ISO 8062 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.
vi © ISO 2023 – All rights reserved
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ISO/FDIS 8062-4:2023(E)
Introduction

This document is a geometrical product specification (GPS) standard and is to be regarded as a

complementary ISO GPS standard. It influences chain link B of the chain of standards on mouldingssize,

form, orientation and location.

The ISO GPS matrix model given in ISO 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 and the

default decision rules given in ISO 14253-1 apply to specifications made in accordance with this

document, unless otherwise indicated.

For more detailed information about the relation of this document to other standards and the GPS matrix

model, see Annex I.

This document gives terms and definitions and symbols for product definition indications for tolerancing

of moulded parts, which are to be used in addition to the usual standards on geometrical product

specifications (GPS), such as ISO 1101, ISO 5458 and ISO 5459.

According to this document, ± tolerances are only used for sizes and the following non-features of size:

wall thicknesses, fillets and chamfers. Positional tolerances are also applied for sizes specified

with ± tolerances. For all other tolerancing purposes, geometrical tolerances according to ISO 1101 are

used. For all other non-features of size, e.g.such as step dimension, ± tolerances are not recommended.

See the ISO 14405 series for background information.

This document defines a system of tolerance grades, draft angle (taper) grades and machining allowance

grades for cast metals and their alloys.

ISO/TS 8062-2 states, in relation to the accumulation method where general dimensional tolerances

according to ISO 8062-3 are used, that there is not yet a clearly defined way in the context of the future

system of ISO GPS standards, to apply the rules for calculating the final moulded part nominal dimensions

from the final machined moulded part nominal dimensions, taking into account the miscellaneous

influences. One of the reasons for this problem is the lack of a proper workpiece datum system.

The general dimensional tolerances apply independently from each other (without a datum system). It is

difficult or even impossible to assess what the overall shape of the workpiece can become.

The general dimensional tolerances (±tolerances) of ISO 8062-3 apply not only to sizes but also to centre

distances and dimensions defining profile contours. This is in contradiction to the ISO GPS rules (e.g.

ISO 14405-2).

The general tolerances of ISO 8062-4 are not in compliance with the rules of ISO 22081 with respect to

the general geometrical tolerancing.

Furthermore, with 3D CAD the nominal dimensions are not always visible in the model. As the general

dimensional tolerances depend on the nominal dimensions, they cannot be used any moreanymore when

only the CAD model is available. To avoid these problems this document was developed as a parallel

approach fully conforming with the ISO GPS rules given in, for example, ISO 14405-2 by introducing

profile tolerancing and a datum system.

If there is no datum system specified or if the datum surfaces are to be machined after moulding then

only ISO 8062-3 can be applied.

For the development of a new product, it is strongly recommended that customer and foundry should

discuss and agree on the method of tolerancing to be applied to the product. This also includes casting

method, calculation methods, cast material and draft angles, which are crucial for the process.

© ISO 2023 – All rights reserved vii
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FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 8062-4:2023(E)
Geometrical product specifications — Dimensional and
geometrical tolerances for moulded parts — Part 4: Rules and
general tolerances for castings using profile tolerancing in a
general datum system
1 Scope

This document specifies the rules for geometrical dimensioning and tolerancing of final moulded parts

and parts machined out of moulded parts. It also specifies rules and conventions for the indications of

these requirements in technical product documentation and specifies the proportions and dimensions of

the graphical symbols to be used.

This document provides symbols for identifying the relative completeness of the moulded features and

parts. These graphical symbols differ from the graphical symbols for surface texture according to

ISO 1302, which are notably larger.

This document specifies general geometrical tolerances using surface profile tolerances related to a

general datum system that remains on the final part. It also specifies machining allowances and draft

angles (tapers) for castings in all cast metals and their alloys produced by various casting manufacturing

processes.

This document establishes the general principles for presentation of general geometrical tolerances that

apply to 2D technical drawings in all disciplines and trades but which are also applicable to 3D

applications.
NOTE All figures are shown in 2D views only.
When cast datum surfaces are machined, this document is not applicable.
2 Normative 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 129-1, Technical product documentation (TPD) -— Presentation of dimensions and tolerances -— Part

1: General principles

ISO 1101, 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 1660, Geometrical product specifications (GPS) — Geometrical tolerancing — Profile tolerancing

Cancelled and replaced by ISO 21920-1.
© ISO 2023 – All rights reserved 1
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ISO/FDIS 8062-4:2023(E)

ISO 2692, Geometrical product specifications (GPS) — Geometrical tolerancing — Maximum material

requirement (MMR), least material requirement (LMR) and reciprocity requirement (RPR)

ISO 5458, Geometrical product specifications (GPS) — Geometrical tolerancing — Pattern and combined

geometrical specification

ISO 5459, Geometrical product specifications (GPS) — Geometrical tolerancing — Datums and datum

systems

ISO 7083, Technical drawingsproduct documentation — Symbols for geometrical tolerancingused in

technical product documentation — Proportions and dimensions

ISO 8015, Geometrical product specifications (GPS) — Fundamentals — Concepts, principles and rules

ISO 8062-1, Geometrical product specifications (GPS) — Dimensional and geometrical tolerances for

moulded parts — Part 1: Vocabulary

ISO 8785, Geometrical Product SpecificationsSpecification (GPS) — Surface imperfections — Terms,

definitions and parameters

ISO 10135, Geometrical product specifications (GPS) — Drawing indications for moulded parts in technical

product documentation (TPD)

ISO 10579, Geometrical product specifications (GPS) — Dimensioning and tolerancing — Non-rigid parts

ISO 13715, Technical product documentation — Edges of undefined shape — Indication and dimensioning

ISO 14405-1, Geometrical product specifications (GPS) — Dimensional tolerancing — Part 1: Linear sizes

ISO 14405-2, Geometrical product specifications (GPS) — Dimensional tolerancing — Part 2: Dimensions

other than linear or angular sizes

ISO 14405-3, Geometrical product specifications (GPS) — Dimensional tolerancing — Part 3: Angular sizes

ISO 16792, Technical product documentation — Digital product definition data practices

ISO 21204, Geometrical product specifications (GPS) — Transition specification

ISO 22081, Geometrical product specifications (GPS) — Geometrical tolerancing — General geometrical

specifications and general size specifications

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 1101, ISO 1660, ISO 2692,

ISO 5458, ISO 5459, ISO 8062-1, ISO 10135, ISO 10579, and ISO 16792 and the following apply.

ISO and IEC maintain terminologicalterminology 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/
2 © ISO 2023 – All rights reserved
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ISO/FDIS 8062-4:2023(E)
3.1
moulded feature
feature of a moulded part which has not been machined
3.2
intermediate machined feature

feature of a moulded part which has undergone some machining and which subsequently will be

machined to its final condition

Note 1 to entry: An intermediate machined feature is typically a roughly machined moulded feature (3.1).

Note 2 to entry: An intermediate machined feature can be used as a datum for subsequent machining of the

moulded part.
3.3
final machined feature
feature of a moulded part which has been machined to its final condition
3.4
final moulded part
moulded part after fettling (if any)

Note 1 to entry: A final moulded part only consists of features which are moulded and have not been finished

except by fettling.
3.5
intermediate machined moulded part

moulded part which has undergone some machining and which subsequently will be machined to its final

condition

Note 1 to entry: An intermediate machined moulded part consists of at least one moulded feature (3.1) to be

subsequently machined or at least one intermediate machined feature (3.2). In addition, it consists of moulded

features not to be machined (if any) and final machined features (3.3) (if any).

Note 2 to entry: An intermediate machined moulded part can be produced from a final moulded part (3.4) or from

another intermediate machined moulded part.
3.6
final machined moulded part
moulded part which has been machined to its final condition

Note 1 to entry: A final machined moulded part consists of final machined features (3.3) and can include moulded

features (3.1) not to be machined. A final machined moulded part cannot include intermediate machined moulded

features.

Note 2 to entry: A final machined moulded part can be produced from a final moulded part (3.4) or from an

intermediate machined moulded part (3.5).
3.7
moulded part condition
manufacturing stage of a moulded part

Note 1 to entry: Listed in chronological order of manufacturing, a moulded part can be in a final moulded part

(3.4) condition, intermediate machined moulded part (3.5) condition or final machined moulded part (3.6) condition.

© ISO 2023 – All rights reserved 3
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ISO/FDIS 8062-4:2023(E)
Note 2 to entry: Only one final moulded part condition exists.

Note 3 to entry: Various intermediate machined moulded part conditions can exist.

Note 4 to entry: Only one final machined moulded part condition can exist.

Note 5 to entry: A moulded part does not need to exist in an intermediate machined moulded part condition

before the final machined moulded part condition.

Note 6 to entry: Heat treatment or straightening (correction of unintended distortion) can be carried out in any

moulded part condition.
3.8
product definition
drawing or a 3D model representing the product
3.9
single product definition

product definition (3.8) of a moulded part giving requirements for one moulded part condition (3.7) only

3.10
combined product definition

product definition of a moulded part giving requirements for more than one moulded part condition (3.7)

3.11
draft angle
taper

value of inclination (angle) that is added to a geometrical feature of a pattern or mould to ensure the

removal of the pattern or moulded part from the mould
3.12
external draft angle

draft angle (3.11) on a surface that has no opposite surface in the direction outward of the part

Note 1 to entry: See Figure 1.
3.13
internal draft angle

draft angle (3.11) on a surface that has an opposite surface in the direction outward of the part

Note 1 to entry: See Figure 1.
4 © ISO 2023 – All rights reserved
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ISO/FDIS 8062-4:2023(E)
Key
L𝐿𝐿 length of the external feature
L𝐿𝐿
length of the internal feature
2 2
α 𝛼𝛼
external draft angle
e e
α𝛼𝛼 internal draft angle
Figure 1 — External and internal draft angles
3.14
single inclination symbol

symbol indicating the nominal model by the stated draft angle (3.11) with symmetrical tolerance zone

increasing the geometrical model feature(s) draft angle which is part of the model geometry

Note 1 to entry: See Figure 17c).
3.15
draft angle increasing the tolerance of feature(s)

draft angle (3.11) which is added to the model geometry and included in the tolerance zone

Note 1 to entry: See Figure 17 d).
3.1615
general datum system RST

datum system according to ISO 5459, locking all degrees of freedom and used for the general tolerance.

Note 1 to entry: Annex G provides an example of using general tolerances. For the general datum system RST, see

Figure G.2.

Note 2 to entry: It is recommended to usethat the datum feature identifiers R, S, and T are used for the general

datum systems for moulded parts.

Note 3 to entry: It is recommended that a datum target system RST is used, see Figure G.1.

Note 4 to entry: The datum letters R, S, T are reserved for the general datum system, see 10.3.

© ISO 2023 – All rights reserved 5
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ISO/FDIS 8062-4:2023(E)
3.1716
wall thickness

minimum dimension between two surfaces (external and internal) enclosing solid material

Note 1 to entry: The surface couldcan be planar, cylindrical, complex surfaces or any combinationscombination

thereof.
5 Symbols
4 Graphical symbols

Table 1 gives an overview of the graphical symbols used in this document, with their. Their proportions

and dimensions beingshall be as specified in Annex
...

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 8062-4
ISO/TC 213
Geometrical product specifications
Secretariat: BSI
(GPS) — Dimensional and geometrical
Voting begins on:
2023-01-30 tolerances for moulded parts —
Voting terminates on:
Part 4:
2023-03-27
Rules and general tolerances for
castings using profile tolerancing in a
general datum system
Spécification géométrique des produits (GPS) — Tolérances
dimensionnelles et géométriques pour les pièces moulées —
Partie 4: Tolérances générales pour les pièces moulées par
tolérancement de profil dans un système général de références
spécifiées
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 8062-4:2023(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 2023
---------------------- Page: 1 ----------------------
ISO/FDIS 8062-4:2023(E)
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 8062-4
ISO/TC 213
Geometrical product specifications
Secretariat: BSI
(GPS) — Dimensional and geometrical
Voting begins on:
tolerances for moulded parts —
Voting terminates on:
Part 4:
Rules and general tolerances for
castings using profile tolerancing in a
general datum system
Spécification géométrique des produits (GPS) — Tolérances
dimensionnelles et géométriques pour les pièces moulées —
Partie 4: Tolérances générales pour les pièces moulées par
tolérancement de profil dans un système général de références
spécifiées
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DRAFT INTERNATIONAL STANDARDS MAY ON
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DARDS TO WHICH REFERENCE MAY BE MADE IN
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---------------------- Page: 2 ----------------------
ISO/FDIS 8062-4:2023(E)
Contents Page

Foreword ..........................................................................................................................................................................................................................................v

Introduction .............................................................................................................................................................................................................................. vi

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ..................................................................................................................................................................................... 1

3 Terms and definitions .................................................................................................................................................................................... 2

4 Graphical symbols .............................................................................................................................................................................................. 5

5 Product definition type indicator ........................................................................................................................................... ...........6

5.1 Single and combined product definitions ....................................................................................................................... 6

5.2 Final moulded part product definitions ........................................................................................................................... 6

5.3 Intermediate machined moulded part product definitions ........................................................................... 7

5.4 Final machined moulded part product definition ................................................................................................... 7

5.5 Identifier for machining by the supplier .......................................................................................................................... 7

6 Product definition indications .............................................................................................................................................................. 8

6.1 Surface texture symbols ................................................................................................................................................................ 8

6.2 Part condition identifiers .............................................................................................................................................................. 8

6.2.1 General ........................................................................................................................................................................................ 8

6.2.2 Surface texture .................................................................................................................................................................... 9

6.2.3 Linear sizes ................................... ........................................................................................................ ................................ 10

6.2.4 Linear dimensions and individually indicated dimensional tolerances ........................ 10

6.2.5 Theoretically exact dimensions (TEDs)...................................................................................................... 10

6.2.6 Geometrical tolerances and datums .............................................................................................................. 10

6.3 Required machining allowance (RMA) ..........................................................................................................................12

6.3.1 General .....................................................................................................................................................................................12

6.3.2 General RMA ....................................................................................................................................................................... 12

6.3.3 Individual RMA .................................................................................................................................................................12

6.4 Draft angles ............................................................................................................................................................................................12

7 Indication of general tolerances ........................................................................................................................................... ............14

7.1 General tolerances according to this document .................................................................................................... 14

7.2 General surface profile tolerance ....................................................................................................................................... 14

8 Types of specifications ...............................................................................................................................................................................15

8.1 General ........................................................................................................................................................................................................ 15

8.2 Specification of final moulded part condition ......................................................................................................... 15

8.2.1 Overview of specification of final moulded part condition ................................... ....................15

8.2.2 Specification of final moulded part condition by the casting calculation

method .....................................................................................................................................................................................15

8.2.3 Specification of final moulded part condition by the multiple tolerancing

method ..................................................................................................................................................................................... 16

8.3 Specification of intermediate machined moulded part conditions ...................................................... 16

8.4 Specification of final machined moulded part condition ............................................................................... 17

9 Tolerancing .............................................................................................................................................................................................................17

9.1 General ........................................................................................................................................................................................................ 17

9.2 Tolerancing of final moulded parts ................................................................................................................................... 17

9.2.1 Recommendations.......................................................................................................................................................... 17

9.2.2 Drafts ......................................................................................................................................................................................... 18

9.3 Tolerancing of intermediate machined moulded parts ................................................................................... 18

9.4 Tolerancing of final machined moulded parts ......................................................................................................... 18

9.4.1 General ..................................................................................................................................................................................... 18

9.4.2 Drafts ......................................................................................................................................................................................... 18

9.4.3 Multiple tolerancing method ................................................................................................................................ 18

10 Rules ...............................................................................................................................................................................................................................19

iii
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10.1 Rule A: Application of general tolerances for castings .................................................................................... 19

10.2 Rule B: General surface profile tolerances ................................................................................................................. 19

10.3 Rule C: General datum system RST ................................................................................................................................... 20

10.4 Rule D: Tolerances overruling the general surface profile tolerances ...............................................20

10.5 Rule E: Additional tolerances.................................................................................................................................................. 21

10.6 Rule F: Machined condition ...................................................................................................................................................... 21

10.7 Rule G: Required machining allowances (RMA) .................................................................................................... 21

10.8 Rule H: Draft angle (taper) ........................................................................................................................................................ 21

10.9 Rule I: Wall thickness .................................................................................................................................................................... 21

11 General tolerances ..........................................................................................................................................................................................22

12 Required machining allowances (RMAs) ...............................................................................................................................23

13 Draft angles ............................................................................................................................................................................................................24

14 General product definition indication .......................................................................................................................................26

Annex A (normative) Proportions and dimensions of graphical symbols ...............................................................28

Annex B (informative) Proposed process for general tolerancing castings ...........................................................30

Annex C (informative) Examples for the multiple tolerancing method ......................................................................31

Annex D (informative) Drawing examples .................................................................................................................................................33

Annex E (informative) Selection of general tolerances.................................................................................................................39

Annex F (informative) Selection of required machining allowances (RMA) .........................................................40

Annex G (informative) Example of using general tolerances .................................................................................................41

Annex H (normative) Calculation of the nominal dimension of the moulded

condition — casting calculation method ............................................................................................................................... 44

Annex I (informative) Relationship to the GPS matrix model ...............................................................................................47

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

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ISO/FDIS 8062-4:2023(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.

This second edition cancels and replaces the first edition (ISO 8062-4:2017), which has been technically

revised.
The main changes are as follows:

— overall clarification regarding better applicability according to the ISO GPS system;

— overall revision of tables and figures for plausibility;

— new symbols for draft angles with symmetrical/unsymmetrical tolerance zones as already included

in the model geometry or drawing outlines have been added;

— requirements for the indication in the product definition (new Clauses 5, 6 and 7) and types of

specifications (new Clause 8) have been added;
— Rule I concerning the wall thickness has been added;

— Clause 9 and Annex G have been added, expanding the information previously given in former

Annex A;
— new Annexes A, B and C have been added;
A list of all parts in the ISO 8062 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.
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ISO/FDIS 8062-4:2023(E)
Introduction

This document is a geometrical product specification (GPS) standard and is to be regarded as a

complementary ISO GPS standard. It influences chain link B of the chain of standards on size, form,

orientation and location.

The ISO GPS matrix model given in ISO 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 and

the default decision rules given in ISO 14253-1 apply to specifications made in accordance with this

document, unless otherwise indicated.

For more detailed information about the relation of this document to other standards and the GPS

matrix model, see Annex I.

This document gives terms and definitions and symbols for product definition indications for

tolerancing of moulded parts, which are to be used in addition to the usual standards on geometrical

product specifications (GPS), such as ISO 1101, ISO 5458 and ISO 5459.

According to this document, ± tolerances are only used for sizes and the following non-features of

size: wall thicknesses, fillets and chamfers. Positional tolerances are also applied for sizes specified

with ± tolerances. For all other tolerancing purposes, geometrical tolerances according to ISO 1101 are

used. For all other non-features of size, such as step dimension, ± tolerances are not recommended. See

the ISO 14405 series for background information.

This document defines a system of tolerance grades, draft angle (taper) grades and machining allowance

grades for cast metals and their alloys.

ISO/TS 8062-2 states, in relation to the accumulation method where general dimensional tolerances

according to ISO 8062-3 are used, that there is not yet a clearly defined way in the context of the

future system of ISO GPS standards to apply the rules for calculating the final moulded part nominal

dimensions from the final machined moulded part nominal dimensions, taking into account the

miscellaneous influences. One of the reasons for this problem is the lack of a proper workpiece datum

system.

The general dimensional tolerances apply independently from each other (without a datum system). It

is difficult or even impossible to assess what the overall shape of the workpiece can become.

The general dimensional tolerances (±tolerances) of ISO 8062-3 apply not only to sizes but also to centre

distances and dimensions defining profile contours. This is in contradiction to the ISO GPS rules (e.g.

ISO 14405-2).

The general tolerances of ISO 8062-4 are not in compliance with the rules of ISO 22081 with respect to

the general geometrical tolerancing.

Furthermore, with 3D CAD the nominal dimensions are not always visible in the model. As the general

dimensional tolerances depend on the nominal dimensions, they cannot be used anymore when only the

CAD model is available. To avoid these problems this document was developed as a parallel approach

fully conforming with the ISO GPS rules given in, for example, ISO 14405-2 by introducing profile

tolerancing and a datum system.

If there is no datum system specified or if the datum surfaces are to be machined after moulding then

only ISO 8062-3 can be applied.

For the development of a new product, it is strongly recommended that customer and foundry should

discuss and agree on the method of tolerancing to be applied to the product. This also includes casting

method, calculation methods, cast material and draft angles, which are crucial for the process.

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FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 8062-4:2023(E)
Geometrical product specifications (GPS) — Dimensional
and geometrical tolerances for moulded parts —
Part 4:
Rules and general tolerances for castings using profile
tolerancing in a general datum system
1 Scope

This document specifies the rules for geometrical dimensioning and tolerancing of final moulded parts

and parts machined out of moulded parts. It also specifies rules and conventions for the indications of

these requirements in technical product documentation and specifies the proportions and dimensions

of the graphical symbols to be used.

This document provides symbols for identifying the relative completeness of the moulded features

and parts. These graphical symbols differ from the graphical symbols for surface texture according to

ISO 1302,1
1 Cancelled and replaced by ISO 21920-1.

This document specifies general geometrical tolerances using surface profile tolerances related to a

general datum system that remains on the final part. It also specifies machining allowances and draft

angles (tapers) for castings in all cast metals and their alloys produced by various casting manufacturing

processes.

This document establishes the general principles for presentation of general geometrical tolerances

that apply to 2D technical drawings in all disciplines and trades but which are also applicable to 3D

applications.
NOTE All figures are shown in 2D views only.
When cast datum surfaces are machined, this document is not applicable.
2 Normative 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 129-1, Technical product documentation (TPD) — Presentation of dimensions and tolerances — Part 1:

General principles

ISO 1101, 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 1660, Geometrical product specifications (GPS) — Geometrical tolerancing — Profile tolerancing

ISO 2692, Geometrical product specifications (GPS) — Geometrical tolerancing — Maximum material

requirement (MMR), least material requirement (LMR) and reciprocity requirement (RPR)

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ISO/FDIS 8062-4:2023(E)

ISO 5458, Geometrical product specifications (GPS) — Geometrical tolerancing — Pattern and combined

geometrical specification

ISO 5459, Geometrical product specifications (GPS) — Geometrical tolerancing — Datums and datum

systems

ISO 7083, Technical product documentation — Symbols used in technical product documentation —

Proportions and dimensions

ISO 8015, Geometrical product specifications (GPS) — Fundamentals — Concepts, principles and rules

ISO 8062-1, Geometrical product specifications (GPS) — Dimensional and geometrical tolerances for

moulded parts — Part 1: Vocabulary

ISO 8785, Geometrical Product Specification (GPS) — Surface imperfections — Terms, definitions and

parameters

ISO 10135, Geometrical product specifications (GPS) — Drawing indications for moulded parts in technical

product documentation (TPD)

ISO 10579, Geometrical product specifications (GPS) — Dimensioning and tolerancing — Non-rigid parts

ISO 13715, Technical product documentation — Edges of undefined shape — Indication and dimensioning

ISO 14405-1, Geometrical product specifications (GPS) — Dimensional tolerancing — Part 1: Linear sizes

ISO 14405-2, Geometrical product specifications (GPS) — Dimensional tolerancing — Part 2: Dimensions

other than linear or angular sizes

ISO 14405-3, Geometrical product specifications (GPS) — Dimensional tolerancing — Part 3: Angular sizes

ISO 16792, Technical product documentation — Digital product definition data practices

ISO 21204, Geometrical product specifications (GPS) — Transition specification

ISO 22081, Geometrical product specifications (GPS) — Geometrical tolerancing — General geometrical

specifications and general size specifications

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 1101, ISO 1660, ISO 2692,

ISO 5458, ISO 5459, ISO 8062-1, ISO 10135, ISO 10579 and ISO 16792 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
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
moulded feature
feature of a moulded part which has not been machined
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ISO/FDIS 8062-4:2023(E)
3.2
intermediate machined feature

feature of a moulded part which has undergone some machining and which subsequently will be

machined to its final condition

Note 1 to entry: An intermediate machined feature is typically a roughly machined moulded feature (3.1).

Note 2 to entry: An intermediate machined feature can be used as a datum for subsequent machining of the

moulded part.
3.3
final machined feature
feature of a moulded part which has been machined to its final condition
3.4
final moulded part
moulded part after fettling (if any)

Note 1 to entry: A final moulded part only consists of features which are moulded and have not been finished

except by fettling.
3.5
intermediate machined moulded part

moulded part which has undergone some machining and which subsequently will be machined to its

final condition

Note 1 to entry: An intermediate machined moulded part consists of at least one moulded feature (3.1) to be

subsequently machined or at least one intermediate machined feature (3.2). In addition, it consists of moulded

features not to be machined (if any) and final machined features (3.3) (if any).

Note 2 to entry: An intermediate machined moulded part can be produced from a final moulded part (3.4) or from

another intermediate machined moulded part.
3.6
final machined moulded part
moulded part which has been machined to its final condition

Note 1 to entry: A final machined moulded part consists of final machined features (3.3) and can include moulded

features (3.1) not to be machined. A final machined moulded part cannot include intermediate machined moulded

features.

Note 2 to entry: A final machined moulded part can be produced from a final moulded part (3.4) or from an

intermediate machined moulded part (3.5).
3.7
moulded part condition
manufactur
...