SIST EN ISO 8062-3:2007

Geometrical Product Specifications (GPS) - Dimensional and geometrical tolerances for moulded parts - Part 3: General dimensional and geometrical tolerances and machining allowances for castings (ISO 8062-3:2007)

This part of ISO 8062 specifies general dimensional and geometrical tolerances, as well as machining allowance grades, for castings as delivered to the purchaser in accordance with ISO 8062-2. It is applicable for the tolerancing of dimensions and geometry, and required machining allowance of castings in all cast metals and their alloys produced by various casting manufacturing processes. This part of ISO 8062 applies to both general dimensional and general geometrical tolerances (referred to in or near the title block of the drawing), unless otherwise specified, and where specifically referred to on the drawing by one of the references in Clause 9. The dimensional tolerances covered by this part of ISO 8062 are tolerances for linear dimensions. The geometrical tolerances covered by this part of ISO 8062 are: tolerances for straightness, flatness, roundness, parallelism, perpendicularity, symmetry, and coaxiality. This part of ISO 8062 can be used for the selection of tolerance values for individual indications.

Geometrische Produktspezifikation (GPS) - Maß-, Formund Lagetoleranzen für Formteile - Teil 3: Allgemeine Maß-, Form- und Lagetoleranzen und Bearbeitungszugaben für Gussstücke (ISO 8062-3:2007)

Dieser Teil der ISO 8062 legt allgemeine Maß-, Form- und Lagetoleranzen sowie Grade für Bearbeitungs¬zugaben für Gussstücke im Lieferzustand fest, die dem Käufer nach ISO 8062 2 geliefert werden. Sie ist anwendbar für die Maß-, Form- und Lagetolerierung und erforderliche Bearbeitungszugabe von nach verschiedenen Fertigungsverfahren hergestellten Gussstücken aus allen metallischen Werkstoffen und deren Legierungen.
Dieser Teil der ISO 8062 gilt sowohl für (im oder nahe am Zeichnungsschriftfeld der Zeichnung) angegebene allgemeine Maß-, Form- und Lagetoleranzen als auch für (direkt in der Zeichnung angegebene) individuelle Toleranzen und wo besonders in der Zeichnung auf Hinweise von Abschnitt 9 Bezug genommen wird, falls nichts anderes festgelegt ist.
Die in diesem Teil der ISO 8062 enthaltenen Maßtoleranzen sind Toleranzen für Längenmaße.
Die in diesem Teil der ISO 8062 enthaltenen Form- und Lagetoleranzen sind
   Geradheitstoleranzen,
   Ebenheitstoleranzen,
   Rundheitstoleranzen,
   Parallelitätstoleranzen,
   Rechtwinkligkeitstoleranzen,
   Symmetrie- und
   Koaxialitätstoleranzen.
Dieser Teil der ISO 8062 kann für die Auswahl von individuellen Toleranzwerten angewendet werden.
ANMERKUNG   Dieser Teil der ISO 8062 gilt nicht für 3D-CAD-Modelle ohne Angabe von Maßen.

Spécification géométrique des produits (GPS) - Tolérances dimensionnelles et géométriques des pieces moulées - Partie 3: Tolérances dimensionnelles et géométriques générales et surépaisseurs d'usinage pour les pieces moulées (ISO 8062-3:2007)

L'ISO 8062-3:2007 spécifie des classes de tolérances dimensionnelles et géométriques générales ainsi que des classes de surépaisseurs d'usinage pour les pièces moulées telles qu'elles sont livrées à l'acheteur, conformément à l'ISO 8062-2. Elle s'applique au tolérancement des dimensions et de la géométrie, et aux surépaisseurs d'usinage, des pièces moulées en tous métaux et leurs alliages, produites par différents procédés de fabrication par moulage.
L'ISO 8062-3:2007 s'applique à la fois aux tolérances dimensionnelles et géométriques générales, sauf spécification contraire.
Les tolérances dimensionnelles couvertes par l'ISO 8062-3:2007 sont les tolérances pour des dimensions linéaires.
Les tolérances géométriques couvertes par l'ISO 8062-3:2007 sont les tolérances pour:
la rectitude,
la planéité,
la circularité,
le parallélisme,
la perpendicularité,
la symétrie, et
la coaxialité.
L'ISO 8062-3:2007 peut être utilisée pour le choix des valeurs pour des tolérances particulières.

Specifikacije geometrijskih izdelkov - Dimenzijske in geometrijske tolerance zaformanih delov – 3. del: Splošne dimenzijske in geometrijske tolerance in dodatki za obdelavo ulitkov (ISO 8062-3:2007)

General Information

• Status: Withdrawn
• Publication Date: 19-Jun-2007
• Withdrawal Date: 12-Mar-2023
• ICS: 17.040.10 - Limits and fits
• ICS: 17.040.40 - Geometrical Product Specification (GPS)
• Technical Committee: IFEK - Ferrous metals
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 09-Mar-2023
• Due Date: 01-Apr-2023
• Completion Date: 13-Mar-2023
• Ref Project: EN ISO 8062-3:2007 - Geometrical Product Specifications (GPS) - Dimensional and geometrical tolerances for moulded parts - Part 3: General dimensional and geometrical tolerances and machining allowances for castings (ISO 8062-3:2007)

Relations

• Corrected By: SIST EN ISO 8062-3:2007/AC:2009 - Geometrical Product Specifications (GPS) - Dimensional and geometrical tolerances for moulded parts - Part 3: General dimensional and geometrical tolerances and machining allowances for castings
• Effective Date: 01-Jun-2009
• Revises: SIST EN ISO 8062-3:2023 - Geometrical product specifications (GPS) - Dimensional and geometrical tolerances for moulded parts - Part 3: General dimensional and geometrical tolerances and machining allowances for castings using ± tolerances for indicated dimensions (ISO 8062-3:2023)
• Effective Date: 19-Jan-2023
• Replaces: SIST ISO 8062:1995 - Castings -- System of dimensional tolerances and machining allowances
• Effective Date: 01-Jan-2014

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 8062-3:2007
01-julij-2007
1DGRPHãþD
SIST ISO 8062:1995
Specifikacije geometrijskih izdelkov - Dimenzijske in geometrijske tolerance
zaformanih delov – 3. del: Splošne dimenzijske in geometrijske tolerance in
dodatki za obdelavo ulitkov (ISO 8062-3:2007)
Geometrical Product Specifications (GPS) - Dimensional and geometrical tolerances for
moulded parts - Part 3: General dimensional and geometrical tolerances and machining
allowances for castings (ISO 8062-3:2007)
*HRPHWULVFKH3URGXNWVSH]LILNDWLRQ*360D‰)RUPXQG/DJHWROHUDQ]HQIU)RUPWHLOH
7HLO$OOJHPHLQH0D‰)RUPXQG/DJHWROHUDQ]HQXQG%HDUEHLWXQJV]XJDEHQIU
*XVVVWFNH,62
Spécification géométrique des produits (GPS) - Tolérances dimensionnelles et
géométriques des pieces moulées - Partie 3: Tolérances dimensionnelles et
géométriques générales et surépaisseurs d'usinage pour les pieces moulées (ISO 8062-
3:2007)
Ta slovenski standard je istoveten z: EN ISO 8062-3:2007
ICS:
17.040.10 Tolerance in ujemi Limits and fits
17.040.40 6SHFLILNDFLMDJHRPHWULMVNLK Geometrical Product
YHOLþLQL]GHOND*36 Specification (GPS)
SIST EN ISO 8062-3:2007 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 8062-3:2007

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SIST EN ISO 8062-3:2007
EUROPEAN STANDARD
EN ISO 8062-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2007
ICS 17.040.10

English Version
Geometrical Product Specifications (GPS) - Dimensional and
geometrical tolerances for moulded parts - Part 3: General
dimensional and geometrical tolerances and machining
allowances for castings (ISO 8062-3:2007)
Spécification géométrique des produits (GPS) - Tolérances Geometrische Produktspezifikation (GPS) - Maß-, Form-
dimensionnelles et géométriques des pièces moulées - und Lagetoleranzen für Formteile - Teil 3: Allgemeine Maß-,
Partie 3: Tolérances dimensionnelles et géométriques Form- und Lagetoleranzen und Bearbeitungszugaben für
générales et surépaisseurs d'usinage pour les pièces Gussstücke (ISO 8062-3:2007)
moulées (ISO 8062-3:2007)
This European Standard was approved by CEN on 25 February 2007.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2007 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 8062-3:2007: E
worldwide for CEN national Members.

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SIST EN ISO 8062-3:2007

EN ISO 8062-3:2007 (E)





Foreword


This document (EN ISO 8062-3:2007) has been prepared by Technical Committee ISO/TC 213
"Dimensional and geometrical product specifications and verification" in collaboration with Technical
Committee CEN/TC 190 "Foundry technology", the secretariat of which is held by DIN.

This European Standard shall be given the status of a national standard, either by publication of
an identical text or by endorsement, at the latest by December 2007, and conflicting national
standards shall be withdrawn at the latest by December 2007.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United
Kingdom.


Endorsement notice

The text of ISO 8062-3:2007 has been approved by CEN as EN ISO 8062-3:2007 without any
modifications.

2

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SIST EN ISO 8062-3:2007

INTERNATIONAL ISO
STANDARD 8062-3
First edition
2007-06-01

Geometrical product specifications
(GPS) — Dimensional and geometrical
tolerances for moulded parts —
Part 3:
General dimensional and geometrical
tolerances and machining allowances for
castings
Spécification géométrique des produits (GPS) — Tolérances
dimensionnelles et géométriques des pièces moulées —
Partie 3: Tolérances dimensionnelles et géométriques générales et
surépaisseurs d'usinage pour les pièces moulées




Reference number
ISO 8062-3:2007(E)
©
ISO 2007

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SIST EN ISO 8062-3:2007
ISO 8062-3:2007(E)
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All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
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ii © ISO 2007 – All rights reserved

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SIST EN ISO 8062-3:2007
ISO 8062-3:2007(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 2
4 Abbreviated terms . 2
5 Tolerance grades . 3
5.1 General. 3
5.2 Dimensional casting tolerance grades (DCTG) . 3
5.3 Geometrical casting tolerance grades (GCTG). 4
6 Surface mismatch (SMI) . 7
7 Wall thickness . 7
8 Required machining allowances (RMA) .7
8.1 General. 7
8.2 Required machining allowance grades (RMAG). 8
9 Indication on drawings. 8
9.1 Indication of general dimensional casting tolerances. 8
9.2 Indication of required machining allowances. 9
9.3 Indication of geometrical casting tolerances .9
10 Rejection. 10
Annex A (informative) Casting tolerances and geometrical tolerances . 11
Annex B (informative) Required machining allowance grades (RMAG). 14
Annex C (informative) Concept of general tolerancing of characteristics . 15
Annex D (informative) Datums for general geometrical tolerances. 17
Annex E (informative) Application of general geometrical tolerances for castings . 21
Annex F (informative) Relation to the GPS matrix model . 29
Bibliography . 30

© ISO 2007 – All rights reserved iii

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SIST EN ISO 8062-3:2007
ISO 8062-3:2007(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 8062-3 was prepared by Technical Committee ISO/TC 213, Dimensional and geometrical product
specifications and verification.
This first edition of ISO 8062-3, together with ISO 8062-1 and ISO/TS 8062-2, cancels and replaces
ISO 8062:1994, of which it constitutes a technical revision.
ISO 8062 consists of the following parts, under the general title Geometrical product specifications (GPS) —
Dimensional and geometrical tolerances for moulded parts:
⎯ Part 1: Vocabulary
⎯ Part 3: General dimensional and geometrical tolerances and machining allowances for castings
Rules is to form the subject of a future Part 2 [Technical Specification].

iv © ISO 2007 – All rights reserved

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SIST EN ISO 8062-3:2007
ISO 8062-3:2007(E)
Introduction
This part of ISO 8062 is a geometrical product specification (GPS) standard and is to be regarded as a
complementary process-specific tolerance standard (see ISO/TR 14638). It influences chain link 2 of the chain
of standards on mouldings.
For more detailed information about the relation of this part of ISO 8062 to other standards and the GPS
matrix model, see Annex F.
This part of ISO 8062 defines a system of tolerance grades and machining allowance grades for cast metals
and their alloys.
The specified system applies if the manufacturer provides a pattern or die equipment, or accepts responsibility
for proving it.
The tolerances specified for a casting may determine the casting method. It is therefore recommended, before
the design or the order is finalized, that the customer liaise with the foundry to discuss:
a) the proposed casting design and accuracy required;
b) machining requirements;
c) the method of casting;
d) the location of the parting surfaces and the necessary draft angles;
e) the number of castings to be manufactured;
f) the casting equipment involved;
g) the consequences of the wear-out of the equipment during its life cycle;
h) the datum system in accordance with ISO 5459;
i) the casting alloy;
j) any special requirements, e.g. individual dimensional and geometrical tolerances, fillet radii, tolerances
and individual machining allowances;
NOTE Because the dimensional and geometrical accuracy of a casting is related to production factors, tolerance
grades which can be achieved for various methods and metals are described in Annex A.
k) dimensional tolerances for long series and mass production, where development, adjustment and
maintenance of casting equipment make it possible to achieve close tolerances;
l) dimensional tolerances for short series and single production;
m) geometrical tolerances.
Information on typical required machining allowance grades is given in Annex B.

© ISO 2007 – All rights reserved v

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SIST EN ISO 8062-3:2007

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SIST EN ISO 8062-3:2007
INTERNATIONAL STANDARD ISO 8062-3:2007(E)

Geometrical product specifications (GPS) — Dimensional and
geometrical tolerances for moulded parts —
Part 3:
General dimensional and geometrical tolerances and machining
allowances for castings
1 Scope
This part of ISO 8062 specifies general dimensional and geometrical tolerances, as well as machining
allowance grades, for castings as delivered to the purchaser in accordance with ISO 8062-2. It is applicable
for the tolerancing of dimensions and geometry, and required machining allowance of castings in all cast
metals and their alloys produced by various casting manufacturing processes.
This part of ISO 8062 applies to both general dimensional and general geometrical tolerances (referred to in
or near the title block of the drawing), unless otherwise specified, and where specifically referred to on the
drawing by one of the references in Clause 9.
The dimensional tolerances covered by this part of ISO 8062 are tolerances for linear dimensions.
The geometrical tolerances covered by this part of ISO 8062 are:
⎯ tolerances for straightness,
⎯ flatness,
⎯ roundness,
⎯ parallelism,
⎯ perpendicularity,
⎯ symmetry, and
⎯ coaxiality.
This part of ISO 8062 can be used for the selection of tolerance values for individual indications.
NOTE This part of ISO 8062 does not apply to 3D CAD models used without indicated dimensions.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 286-1:1988, ISO system of limits and fits — Part 1: Bases of tolerances, deviations and fits
ISO 1101:2004, Geometrical Product Specifications (GPS) — Geometrical tolerancing — Tolerances of form,
orientation, location and run-out
© ISO 2007 – All rights reserved 1

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SIST EN ISO 8062-3:2007
ISO 8062-3:2007(E)
ISO 1302:2002, Geometrical Product Specifications (GPS) — Indication of surface texture in technical product
documentation
1)
ISO 5459:— , Geometrical product specifications (GPS) — Geometrical tolerancing — Datums and datum-
systems
ISO 8062-1:2007, Geometrical product specifications (GPS) — Dimensional and geometrical tolerances for
moulded parts — Part 1: Vocabulary
2)
ISO/TS 8062-2:— , Geometrical product specifications (GPS) — Dimensional and geometrical tolerances for
moulded parts — Part 2: Rules
3)
ISO 10135:— , Geometrical product specifications (GPS) — Drawing indications for moulded parts in
technical product documentation (TPD)
ISO 10579:1993, Technical drawings — Dimensioning and tolerancing — Non-rigid parts
4)
ISO 14405:— , Geometrical product specifications (GPS) — Dimensional tolerancing — Linear sizes
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 8062-1, ISO 1101 and ISO 5459
apply.
4 Abbreviated terms
Abbreviated terms are given in Table 1.
Table 1 — Abbreviated terms
Abbreviated term Interpretation Reference
DCT Dimensional casting tolerance 5.2
DCTG Dimensional casting tolerance grade 5.2
GCT Geometrical casting tolerance 5.3
GCTG Geometrical casting tolerance grade 5.3
RMA Required machining allowance Clause 8
RMAG Required machining allowance grade Clause 8
TP Taper + ISO 10135
TM Taper - ISO 10135
SMI Surface mismatch ISO 10135

1) To be published. Revision of ISO 5459:1981.
2) To be published. Revision of ISO 8062:1994.
3) To be published. Revision of ISO 10135:1994.
4) To be published.
2 © ISO 2007 – All rights reserved

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SIST EN ISO 8062-3:2007
ISO 8062-3:2007(E)
5 Tolerance grades
5.1 General
Individual dimensional and geometrical tolerances shall be indicated in accordance with the relevant GPS
standards on dimensional and geometrical tolerancing.
If using general tolerances, the necessity of smaller tolerances (for functional reasons) or of larger tolerances
(for economical reasons) needs to be ascertained (see Annex C). In both cases, individual tolerances shall be
indicated.
For drawings where the tolerances in accordance with this part of ISO 8062 only apply under specified,
restricted conditions, ISO 10579 shall be referred to on the drawing.
5.2 Dimensional casting tolerance grades (DCTG)
Sixteen linear dimensional casting tolerance grades are defined and designated as DCTG 1 to DCTG 16 (see
Table 2).
NOTE 1 For wall thicknesses, see Clause 7.
Table 2 — Linear dimensional casting tolerances (DCT)
Dimensions in millimetres
a
Nominal Linear dimensional tolerance for dimensional casting tolerance grade (DCTG)
dimensions
DCTG DCTG DCTG DCTG DCTG DCTG DCTG DCTG DCTG DCTG DCTG DCTG DCTG DCTG DCTG DCTG
related to the
b
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
moulded part
— u 10 0,09 0,13 0,18 0,26 0,36 0,52 0,74 1 1,5 2 2,8 4,2 — — — —
> 10 u 16 0,1 0,14 0,2 0,28 0,38 0,54 0,78 1,1 1,6 2,2 3 4,4 — — — —
> 16 u 25 0,11 0,15 0,22 0,3 0,42 0,58 0,82 1,2 1,7 2,4 3,2 4,6 6 8 10 12
> 25 u 40 0,12 0,17 0,24 0,32 0,46 0,64 0,9 1,3 1,8 2,6 3,6 5 7 9 11 14
> 40 u 63 0,13 0,18 0,26 0,36 0,5 0,7 1 1,4 2 2,8 4 5,6 8 10 12 16
> 63 u 100 0,14 0,2 0,28 0,4 0,56 0,78 1,1 1,6 2,2 3,2 4,4 6 9 11 14 18
> 100 u 160 0,15 0,22 0,3 0,44 0,62 0,88 1,2 1,8 2,5 3,6 5 7 10 12 16 20
> 160 u 250 — 0,24 0,34 0,5 0,7 1 1,4 2 2,8 4 5,6 8 11 14 18 22
> 250 u 400 — — 0,4 0,56 0,78 1,1 1,6 2,2 3,2 4,4 6,2 9 12 16 20 25
> 400 u 630 — — — 0,64 0,9 1,2 1,8 2,6 3,6 5 7 10 14 18 22 28
> 630 u 1 000 — — — — 1 1,4 2 2,8 4 6 8 11 16 20 25 32
> 1 000 u 1 600 — — — — — 1,6 2,2 3,2 4,6 7 9 13 18 23 29 37
> 1 600 u 2 500 — — — — — — 2,6 3,8 5,4 8 10 15 21 26 33 42
> 2 500 u 4 000 — — — — — — — 4,4 6,2 9 12 17 24 30 38 49
> 4 000 u 6 300 — — — — — — — — 7 10 14 20 28 35 44 56
> 6 300 u 10 000 — — — — — — — — — 11 16 23 32 40 50 64
a
For wall thicknesses in grades DCTG 1 to DCTG 15, one grade coarser applies (see Clause 7).
b
Grade DCTG 16 exists only for wall thicknesses of castings generally specified to DCTG 15.
NOTE 2 Annex A gives recommendations for the application of the above tolerance grades.
As the default conditions for the dimensions, the casting tolerance shall be symmetrically disposed with
respect to the nominal dimension, i.e. with one half on the positive side and one half on the negative side.
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SIST EN ISO 8062-3:2007
ISO 8062-3:2007(E)
If agreed between manufacturer and purchaser for specific reasons, the casting tolerance may be asymmetric.
In such cases, the casting tolerance shall be stated individually, in accordance with ISO 286-1 and ISO 14405,
following the nominal dimensions of the final moulded part.
NOTE 3 In pressure die casting, an asymmetric tolerance disposition is often applied because of special technical
reasons.
5.3 Geometrical casting tolerance grades (GCTG)
5.3.1 General
Seven geometrical casting tolerance grades (GCTG) are defined and designated as GCTG 2 to GCTG 8 (see
Tables 3 to 6).
NOTE 1 GCT values are not given for grade GCTG 1. This grade is reserved for finer values which could be required in
the future.
NOTE 2 See Annex E for application of general geometrical tolerances for castings.
General tolerances on form (straightness, flatness, roundness) and on orientation (angularity, parallelism,
perpendicularity) do not apply to features with draft. These features need individual indicated tolerances,
according to the function and to the manufacturer’s advice.
Other geometrical tolerances than those given in Tables 3 to 6 (e.g. angularity, profile, position, common zone
flatness) shall be indicated individually.
It is therefore recommended to acquire from the manufacturer the information about the design of the mould
regarding the location of the parting surfaces and the amount of draft applied to the features, in order to
complete the drawing (see Introduction).
5.3.2 Nominal dimensions
The nominal dimension to be used in Tables 3 to 6 shall be the longest nominal dimension of the moulded
part of the considered feature, disregarding the nominal dimension of fillets and chamfers that are not
individually indicated.
5.3.3 Datums
5.3.3.1 Datums for general orientation tolerances
For general orientation tolerances in accordance with ISO 8062-3, a datum system shall be specified on the
drawing and identified by the indication “ISO 8062-3 DS” in or near the title block of the drawing, as shown in
Figure 1.

Figure 1 — Drawing indication for the datum system for general orientation tolerances
in accordance with ISO 8062-3
NOTE This datum system does not apply to general geometrical tolerances on coaxiality and symmetry (see 5.3.3.2
and 5.3.3.3).
4 © ISO 2007 – All rights reserved

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SIST EN ISO 8062-3:2007
ISO 8062-3:2007(E)
5.3.3.2 Datums for general coaxiality tolerances
For datums of general coaxiality tolerances, the following conditions apply.
⎯ If one cylindrical feature (internal or external) extends over the whole length of all other cylindrical coaxial
features, the axis of this feature applies as the (single) datum (see Figure D.1).
⎯ Otherwise, a common datum applies, composed of the axes of the two most separated features on the
drawing centre line considered (see Figure D.2). If more than one possibility exist (e.g. internal or external
features), the feature with the largest diameter applies (see Figure D.3).
The general tolerances for coaxiality also apply to the datum features themselves, if a common datum applies.
5.3.3.3 Datums for general symmetry tolerances
For datums of general symmetry tolerances, the following conditions apply.
⎯ If one feature of size (internal or external), composed of two parallel opposite planes, extends over the
whole length of all other co-symmetrical features, the median plane of this feature applies as the (single)
datum (see Figure D.4).
⎯ Otherwise, a common datum applies, composed of the median planes and/or median lines of the two
most separated feature on the drawing centre line (plane) considered (see Figure D.5). If more than one
possibility exist, the feature(s) with the largest size(s) apply (see Figure D.6). One of the two datum
features may be cylindrical (see Figure D.7).
The general tolerances for symmetry also apply to the datum features themselves, if a common datum applies.
Table 3 — Casting tolerances for straightness
Dimensions in millimetres
Nominal dimension Straightness tolerance for geometrical casting tolerance grade (GCTG)
related to the moulded
GCTG 2 GCTG 3 GCTG 4 GCTG 5 GCTG 6 GCTG 7 GCTG 8
part
— u 10 0,08 0,12 0,18 0,27 0,4 0,6 0,9
> 10 u 30 0,12 0,18 0,27 0,4 0,6 0,9 1,4
> 30 u 100 0,18 0,27 0,4 0,6 0,9 1,4 2
> 100 u 300 0,27 0,4 0,6 0,9 1,4 2 3
> 300 u 1 000 0,4 0,6 0,9 1,4 2 3 4,5
> 1 000 u 3 000 — — — 3 4 6 9
> 3 000 u 6 000 — — — 6 8 12 18
> 6 000 u 10 000 — — — 12 16 24 36

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SIST EN ISO 8062-3:2007
ISO 8062-3:2007(E)
Table 4 — Casting tolerances for flatness
Dimensions in millimetres
Flatness tolerance for geometrical casting tolerance grade (GCTG)
Nominal dimension related
to the moulded part
GCTG 2 GCTG 3 GCTG 4 GCTG 5 GCTG 6 GCTG 7 GCTG 8
— u 10 0,12 0,18 0,27 0,4 0,6 0,9 1,4
> 10 u 30 0,18 0,27 0,4 0,6 0,9 1,4 2
> 30 u 100 0,27 0,4 0,6 0,9 1,4 2 3
> 100 u 300 0,4 0,6 0,9 1,4 2 3 4,5
> 300 u 1 000 0,6 0,9 1,4 2 3 4,5 7
> 1 000 u 3 000 — — — 4 6 9 14
> 3 000 u 6 000 — — — 8 12 18 28
> 6 000 u 10 000 — — — 16 24 36 56
Table 5 — Casting tolerances for roundness, parallelism, perpendicularity and symmetry
Dimensions in millimetres
Tolerance for geometrical casting tolerance grade (GCTG)
Nominal dimension related
to the moulded part
GCTG 2 GCTG 3 GCTG 4 GCTG 5 GCTG 6 GCTG 7 GCTG 8
— u 10 0,18 0,27 0,4 0,6 0,9 1,4 2
> 10 u 30 0,27 0,4 0,6 0,9 1,4 2 3
> 30 u 100 0,4 0,6 0,9 1,4 2 3 4,5
> 100 u 300 0,6 0,9 1,4 2 3 4,5 7
> 300 u 1 000 0,9 1,4 2 3 4,5 7 10
> 1 000 u 3 000 — — — 6 9 14 20
> 3 000 u 6 000 — — — 12 18 28 40
> 6 000 u 10 000 — — — 24 36 56 80
Table 6 — Casting tolerances for coaxiality
Dimensions in millimetres
Coaxiality tolerance for geometrical casting tolerance grade (GCTG)
Nominal dimension related
to the moulded part
GCTG 2 GCTG 3 GCTG 4 GCTG 5 GCTG 6 GCTG 7 GCTG 8
— u 10 0,27 0,4 0,6 0,9 1,4 2 3
> 10 u 30 0,4 0,6 0,9 1,4 2 3 4,5
> 30 u 100 0,6 0,9 1,4 2 3 4,5 7
> 100 u 300 0,9 1,4 2 3 4,5 7 10
> 300 u 1 000 1,4 2 3 4,5 7 10 15
> 1 000 u 3 000 — — — 9 14 20 30
> 3 000 u 6 000 — — — 18 28 40 60
> 6 000 u 10 000 — — — 36 56 80 120
Other geometrical tolerances shall be indicated by individually indicated geometrical tolerances.
6 © ISO 2007 – All rights reserved

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SIST EN ISO 8062-3:2007
ISO 8062-3:2007(E)
6 Surface mismatch (SMI)
As the default condition, the surface mismatch A is controlled indirectly by verification of the linear dimensions
in accordance with Table 2 (see Figure 2). The surface mismatch may therefore vary between zero and the
value given in Table 2, depending on the actual local sizes of the feature.
On features without draft, surface mismatch is also controlled and therefore included in the form tolerances for
straightness, flatness and roundness given in Tables 3 to 5.
NOTE This is an overruling of the principle of independency, because it is often not known whether a parting line
exists and, if so, whether the particular feature is affected.

Key
A surface mismatch
B minimum dimension
C maximum dimension
Figure 2 — Limitation of surface mismatch by linear dimension
If it is necessary to restrict further the value of the surface mismatch, the maximum permissible surface
mismatch shall be stated individually in accordance with ISO 10135.
7 Wall thickness
As the default condition, the tolerance for wall thickness in grades DCTG 1 to DCTG 15 shall be one grade
coarser than the general tolerance for other dimensions, e.g. if there is a general tolerance on a drawing of
DCTG 10, the tolerance on wall thicknesses shall be DCTG 11.
8 Require
...