EN ISO 8062-3:2023

SLOVENSKI STANDARD
01-maj-2023
Specifikacija geometrijskih veličin izdelka (GPS) - Dimenzijske in geometrijske
tolerance zaformanih delov - 3. del: Splošne dimenzijske in geometrijske tolerance
ter dodatki za strojno obdelavo ulitkov z uporabo ± toleranc za navedene
dimenzije (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)
Geometrische Produktspezifikationen (GPS) - Maß-, Form- und Lagetoleranzen für
Formteile - Teil 3: Allgemeine Maß-, Form- und Lagetoleranzen und
Bearbeitungszugaben für Gussstücke mit ± Toleranzen für die angegebenen Maße (ISO
8062-3:2023)
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 utilisant
des tolérances ± pour les dimensions indiquées (ISO 8062-3:2023)
Ta slovenski standard je istoveten z: EN ISO 8062-3:2023
ICS:
17.040.10 Tolerance in ujemi Limits and fits
17.040.40 Specifikacija geometrijskih Geometrical Product
veličin izdelka (GPS) Specification (GPS)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 8062-3
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2023
EUROPÄISCHE NORM
ICS 17.040.10 Supersedes EN ISO 8062-3:2007, EN ISO 8062-
3:2007/AC:2009
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 using ± tolerances for
indicated dimensions (ISO 8062-3:2023)
Spécification géométrique des produits (GPS) - Geometrische Produktspezifikationen (GPS) - Maß-,
Tolérances dimensionnelles et géométriques des Form- und Lagetoleranzen für Formteile - Teil 3:
pièces moulées - Partie 3: Tolérances dimensionnelles Allgemeine Maß-, Form- und Lagetoleranzen und
et géométriques générales et surépaisseurs d'usinage Bearbeitungszugaben für Gussstücke mit ± Toleranzen
pour les pièces moulées utilisant des tolérances ± pour für die angegebenen Maße (ISO 8062-3:2023)
les dimensions indiquées (ISO 8062-3:2023)
This European Standard was approved by CEN on 30 December 2022.

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-CENELEC 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-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 8062-3:2023 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 8062-3:2023) 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 September 2023, and conflicting national standards
shall be withdrawn at the latest by September 2023.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 8062-3:2007.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
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,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 8062-3:2023 has been approved by CEN as EN ISO 8062-3:2023 without any
modification.
INTERNATIONAL ISO
STANDARD 8062-3
Second edition
2023-02
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
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 utilisant des
tolérances ± pour les dimensions indiquées
Reference number
ISO 8062-3:2023(E)
ISO 8062-3:2023(E)
© ISO 2023
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: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 8062-3:2023(E)
Contents Page
Foreword .iv
Introduction . vi
1 S c op e . 1
2 N ormative references . 1
3 Terms and definitions . 2
4 Abbr ev i at ed t er m s . 3
5 Tap er . 3
6 D raft angles (taper) . 4
7 T olerance grades . .7
7.1 G eneral . 7
7.2 D imensional casting tolerance grades (DCTG) . 7
7.3 G eometrical casting tolerance grades (GCTG) . 9
7.3.1 General . 9
7. 3 . 2 Nom i n a l d i men s ion s . 9
7. 3 . 3 Dat u m s . 9
8 S urface mismatch (SMI) .12
9 W all thickness.12
10 Re quired machining allowances (RMA) .12
10.1 G eneral .12
10.2 R equired machining allowance grades (RMAG) . 13
11 Indication on drawings .13
11.1 I ndication of general DCTs . 13
11.2 I ndication of machining allowances . 14
11.3 I ndication of geometrical casting tolerances (GCTs) . 14
12 R ejection .15
Annex A (informative) Dimensional and geometrical tolerances for castings .16
Annex B (informative) Required machining allowance grades (RMAG).19
Annex C (informative) Concept of general tolerancing of characteristics.20
Annex D (informative) Datums for general geometrical tolerances .22
Annex E (informative) Application of general geometrical tolerances for castings .26
Annex F (informative) Relation to the GPS matrix model .33
Bibliography .34
iii
ISO 8062-3:2023(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, in collaboration with the European Committee for Standardization (CEN)
Technical Committee CEN/TC 190, Foundry technology, in accordance with the Agreement on technical
cooperation between ISO and CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 8062-3:2007), which has been technically
revised. It also incorporates the Technical Corrigendum ISO 8062-3:2007/Cor 1:2009.
The main changes are as follows:
— clarified in title and scope that this document specifies general dimensional and geometrical
tolerances as well as machining allowance grades for castings using ± tolerances for indicated
dimensions;
— definitions for the terms “draft angle”, “external draft value” and “internal draft angle” have been
added;
— Clause 4 and Clause 5 , including Tables 2 to 6, have been added and subsequent clauses and tables
have been renumbered;
— in Table 7 the linear dimensional casting tolerance grade DCTG 16 has been changed to DCTG 15wt
to clarify the concept of wall thickness;
— the nominal dimension to be used in the tables indicating casting tolerances for straightness,
flatness, roundness, parallelism, perpendicularity, symmetry and coaxiality (Tables 8 to 11) has
been changed;
— Clause 12 on rejection has been clarified;
— the correction according to ISO 8062-3:2007/Cor 1:2009 has been added in Table A.3, footnote b;
— the examples given in Annex E have been corrected;
iv
ISO 8062-3:2023(E)
— inconsistencies have been clarified.
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.
v
ISO 8062-3:2023(E)
Introduction
This document is a geometrical product specification (GPS) standard and is regarded as a
complementary process-specific tolerance standard (see ISO 14638). It influences chain links A and B
on size and A, B and C on distance in the ISO GPS standards matrix model (see Annex F) but is not in full
accordance with the ISO GPS rules.
For more detailed information on the relation of this document to other standards and the GPS matrix
model, see Annex F.
This document defines a system of tolerance grades and machining allowance grades for cast metals
and their alloys. Guidance on its application is given in ISO/TS 8062-2.
It is noted that the dimensional specifications introduced by the application of this document can be
ambiguous when applied to a dimension which is not a size (see ISO 14405-2).
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 liaises with the foundry to discuss:
a) the proposed casting design and accuracy required;
b) machining requirements;
c) moulding method, for example with or without core;
d) 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 equipment wearing out during its life cycle;
h) datum system according to ISO 5459;
i) casting alloy;
j) any special requirements, for instance individual dimensional and geometrical tolerances, fillet
radii, tolerances and individual machining allowances;
NOTE Tolerance grades which can be achieved for various methods and metals are described in
Annex A, because dimensional and geometrical accuracy of a casting is related to production factors.
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.
vi
INTERNATIONAL STANDARD ISO 8062-3:2023(E)
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
1 S cope
This document specifies general dimensional and geometrical tolerances as well as machining
allowance grades for castings using ± tolerances for indicated dimensions as delivered to the purchaser
according to ISO/TS 8062-2. It is applicable for tolerancing of dimensions and geometry of castings in
all cast metals and their alloys produced by various casting manufacturing processes.
This document does not apply to 3D CAD models used without indicated dimensions.
This document 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 11.
The dimensional tolerances covered by this document are tolerances for linear dimensions.
The geometrical tolerances covered by this document are tolerances for:
— straightness;
— flatness;
— roundness;
— parallelism;
— perpendicularity;
— symmetry;
— coaxiality.
This document does not cover other position tolerances, angular dimensional tolerances or cylindricity
tolerances.
This document can be used for the selection of tolerance values for individual indications.
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 129-1, Technical product documentation (TPD) — Presentation of dimensions and tolerances — Part 1:
General principles
ISO 8062-3:2023(E)
ISO 1101, Geometrical product specifications (GPS) — Geometrical tolerancing — Tolerances of form,
orientation, location and run-out
1)
ISO 1302, Geometrical Product Specifications (GPS) — Indication of surface texture in technical product
documentation
ISO 5459, Geometrical product specifications (GPS) — Geometrical tolerancing — Datums and datum
systems
ISO 8062-1, Geometrical product specifications (GPS) — Dimensional and geometrical tolerances for
moulded parts — Part 1: Vocabulary
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
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 1101, ISO 5459, ISO 8062-1
and ISO 10135 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
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
3.2
external draft value
draft angle (3.1) on a surface that has no opposite surface in the direction outward of the part
Note 1 to entry: See Figure 1.
3.3
internal draft angle
draft angle (3.1) on a surface that has an opposite surface in the direction outward of the part
Note 1 to entry: See Figure 1.
1) Cancelled and replaced by ISO 21920-1.
ISO 8062-3:2023(E)
Key
length of the external feature
L
length of the internal feature
L
external draft angle
α
e
internal draft angle
α
i
Figure 1 — External and internal draft angles
4 Abbreviated terms
For the purposes of this document, the abbreviated terms given in Table 1 apply.
Table 1 — Abbreviated terms
Abbreviation Full term
DCT dimensional casting tolerance
DCTG dimensional casting tolerance grade
GCT geometrical casting tolerance
GCTG geometrical casting tolerance grade
RMA required machining allowance
RMAG required machining allowance grade
SG spheroidal graphite
SMI surface mismatch
TM taper minus
TP taper plus
5 Taper
The parting surface shall be indicated by the symbols and according to ISO 10135.
There are three possibilities to indicate taper:
a) the taper is already included in the nominal model;
b) the taper is indicated by the symbol ;
c) the taper is indicated by the symbol .
In case a), the general profile surface tolerance zone is located symmetrically to the nominal surface.
ISO 8062-3:2023(E)
In case b), the general profile surface tolerance zone is located symmetrically to the surface when the
taper is added to the nominal model.
In case c), the general profile surface tolerance zone increases steadily, as shown in Figure 2.
a) Draft angle increasing the ideal model fea- b) Draft angle increasing the tolerance of fea-
ture(s) ture(s)
Key
1 tolerance constant 0,3
2 ideal shape gradually increased ∅40 → ∅40,8
3 tolerance gradually increased 0,3 → 0,7
4 ideal shape constant ∅40
Figure 2 — Taper, tolerance zones
Unless otherwise indicated, taper plus (TP) shall apply. The exception to this rule is for features with
the maximum material requirement specified, where taper minus (TM) shall apply.
6 Dr aft angles (taper)
If indicated in the general drawing indication, see Clause 11, and if not otherwise individually indicated,
the draft angles (taper) in accordance with Tables 2 to 6 apply.
They apply to the longer feature in the direction of taper. For the shorter feature, if any, taper to fit
applies, see ISO 10135. The taper applies as continuously increasing the tolerance (not increasing the
nominal shape).
ISO 8062-3:2023(E)
Table 2 — Draft angles for hand moulding casting
Nominal height Grade A (DA) Grade B (DB)
range of feature for
External Internal External Internal
draft value
> 0 ≤ 4 6,9° (0,4 mm) 8,3° (0,5 mm) 8,8° (0,6 mm) 10,7° (0,7 mm)
> 4 ≤ 6,3 6,5° (0,6 mm) 7,5° (0,7 mm) 5,2° (0,7 mm) 9,3° (0,8 mm)
> 6,3 ≤ 10 4,8° (0,7 mm) 5,4° (0,8 mm) 5,7° (0,8 mm) 7,5° (1,0 mm)
> 10 ≤ 16 3,2° (0,7 mm) 4,1° (0,9 mm) 4,7° (1,0 mm) 5,7° (1,3 mm)
> 16 ≤ 25 2,6° (0,9 mm) 3,0° (1,1 mm) 3,2° (1,1 mm) 4,4° (1,6 mm)
> 25 ≤ 40 2,2° (1,1 mm) 2,9° (1,6 mm) 3,0° (1,5 mm) 4,1° (2,2 mm)
> 40 ≤ 63 1,9° (1,5 mm) 2,4° (2,1 mm) 2,6° (2,1 mm) 3,3° (2,8 mm)
> 63 ≤ 100 1,4° (1,8 mm) 2,0° (2,6 mm) 2,0° (2,4 mm) 2,7° (3,6 mm)
> 100 ≤ 160 1,0° (2,2 mm) 1,5° (3,2 mm) 1,4° (3,0 mm) 2,0° (4,3 mm)
> 160 ≤ 250 0,8° (2,8 mm) 1,2° (4,0 mm) 1,2° (4,0 mm) 1,6° (5,5 mm)
> 250 ≤ 400 0,7° (3,1 mm) 0,9° (5,0 mm) 0,9° (4,5 mm) 1,3° (6,8 mm)
> 400 ≤ 630 0,5° (4,7 mm) 0,8° (6,5 mm) 0,7° (6,3 mm) 1,0° (8,7 mm)
> 630 ≤ 1 000 0,5° (7,0 mm) 0,7° (9,0 mm) 0,7° (9,5 mm) 0,9° (12,5 mm)
> 1 000 ≤ 1 600 0,4° (9,0 mm) 0,5° (11,5 mm) 0,5° (11,5 mm) 0,7° (14,5 mm)
Table 3 — Draft angles for machine moulding casting
Nominal height range Grade A (DA) Grade B (DB)
of feature for draft
External Internal External Internal
value
> 0 ≤ 4 5,8° (0,4 mm) 6,8° (0,5 mm) 7,4° (0,5 mm) 8,6° (0,6 mm)
> 4 ≤ 6,3 5,3° (0,5 mm) 6,0° (0,5 mm) 6,7° (0,6 mm) 7,5° (0,7 mm)
> 6,3 ≤ 10 3,9° (0,5 mm) 4,4° (0,6 mm) 4,7° (0,7 mm) 6,0° (0,8 mm)
> 10 ≤ 16 2,7° (0,6 mm) 3,2° (0,7 mm) 3,9° (0,9 mm) 4,5° (1,0 mm)
> 16 ≤ 25 2,2° (0,8 mm) 2,5° (0,9 mm) 2,8° (1,0 mm) 3,5° (1,2 mm)
> 25 ≤ 40 2,0° (1,1 mm) 2,4° (1,3 mm) 2,7° (1,5 mm) 3,3° (1,8 mm)
> 40 ≤ 63 1,6° (1,4 mm) 1,9° (1,7 mm) 2,0° (1,8 mm) 2,6° (2,2 mm)
> 63 ≤ 100 1,2° (1,7 mm) 1,6° (2,1 mm) 1,6° (2,2 mm) 2,2° (3,0 mm)
> 100 ≤ 160 1,0° (2,3 mm) 1,3° (2,8 mm) 1,3° (2,9 mm) 1,8° (3,9 mm)
> 160 ≤ 250 0,9° (3,0 mm) 1,1° (3,9 mm) 1,2° (4,1 mm) 1,6° (5,4 mm)
> 250 ≤ 400 0,8° (4,3 mm) 1,0° (5,4 mm) 1,1° (5,8 mm) 1,4° (7,4 mm)
> 400 ≤ 630 0,7° (6,2 mm) 0,9° (7,7 mm) 0,9° (7,9 mm) 1,1° (9,8 mm)
> 630 ≤ 1 000 0,5° (7,0 mm) 0,7° (9,0 mm) 0,7° (9,5 mm) 0,9° (12,5 mm)
> 1 000 ≤ 1 600 0,4° (9,0 mm) 0,5° (11,5 mm) 0,5° (11,5 mm) 0,7° (14,5 mm)
Table 4 — Draft angles for permanent moulding casting
Grade A (DA) Grade B (DB)
Nominal height range of
feature for draft
External Internal External Internal
value
draft value draft value draft value 2 draft value 2
— ≤ 4 8,5° (0,3 mm) 11,3° (0,4 mm) 11,3° (0,4 mm) 11,3° (0,4 mm)
> 4 ≤ 6,3 3,3° (0,3 mm) 5,6° (0,5 mm) 5,6° (0,5 mm) 5,6° (0,5 mm)
> 6,3 ≤ 10 3,5° (0,5 mm) 4,9° (0,7 mm) 4,9° (0,7 mm) 5,6° (0,8 mm)
> 10 ≤ 16 3,1° (0,7 mm) 1,4° (1,0 mm) 3,5° (0,8 mm) 5,3° (1,2 mm)
> 16 ≤ 25 2,8° (1,0 mm) 3,9° (1,4 mm) 3,4° (1,2 mm) 4,5° (1,6 mm)
ISO 8062-3:2023(E)
TTabablele 4 4 ((ccoonnttiinnueuedd))
Grade A (DA) Grade B (DB)
Nominal height range of
feature for draft
External Internal External Internal
value
draft value draft value draft value 2 draft value 2
> 25 ≤ 40 2,5° (1,4 mm) 3,5° (2,0 mm) 3,2° (1,8 mm) 4,1° (2,3 mm)
> 40 ≤ 63 2,2° (2,0 mm) 2,8° (2,5 mm) 2,8° (2,5 mm) 3,6° (3,2 mm)
> 63 ≤ 100 1,8° (2,5 mm) 2,8° (4,0 mm) 2,5° (3,6 mm) 3,2° (4,5 mm)
> 100 ≤ 160 1,8° (4,0 mm) 2,2° (5,0 mm) 1,6° (5,0 mm) 2,6° (6,0 mm)
> 160 ≤ 250 1,7° (6,0 mm) 1,8° (6,5 mm) 2,0° (7,0 mm) 2,2° (8,0 mm)
> 250 ≤ 400 1,4° (8,0 mm) 1,6° (9,0 mm) 1,6° (9,0 mm) 1,8° (10,0 mm)
> 400 ≤ 630 1,2° (11,0 mm) 1,3° (12,0 mm) 1,3°(12,0 mm) 1,5° (13,0 mm)
Table 5 — Draft angles for pressure die casting
Grade A (DA) Grade B (DB)
Nominal height range
of feature for draft
External Internal External Internal
value
draft value draft value draft value 2 draft value 2
— ≤ 4 5,7° (0,2 mm) 8,5° (0,3 mm) 8,5° (0,3 mm) 11,3° (0,4 mm)
> 4 ≤ 6,3 2,2° (0,2 mm) 3,3° (0,3 mm) 3,3° (0,3 mm) 5,6° (0,5 mm)
> 6,3 ≤ 10 2,1° (0,3 mm) 2,8° (0,4 mm) 2,8° (0,4 mm) 4,9° (0,7 mm)
> 10 ≤ 16 1,3° (0,3 mm) 2,2° (0,5 mm) 2,2° (0,5 mm) 4,0°(0,9 mm)
> 16 ≤ 25 2,8° (0,4 mm) 2,0° (0,7 mm) 2,0° (0,7 mm) 3,4° (1,2 mm)
> 25 ≤ 40 2,5° (0,7 mm) 2,1° (1,2 mm) 2,1° (1,2 mm) 3,5° (2,0 mm)
> 40 ≤ 63 2,2° (1,0 mm) 1,7° (1,5 mm) 1,7° (1,5 mm) 2,8° (2,5 mm)
> 63 ≤ 100 0,8° (1,2 mm) 1,4° (2,0 mm) 1,4° (2,0 mm) 2,5° (3,5 mm)
> 100 ≤ 160 0,9° (2,0 mm) 1,3° (3,0 mm) 1,3° (3,0 mm) 2,2° (5,0 mm)
> 160 ≤ 250 0,7° (2,5 mm) 1,1° (4,0 mm) 1,1° (4,0 mm) 2,0° (7,0 mm)
> 250 ≤ 400 0,5° (3,0 mm) 0,9° (5,5 mm) 0,9° (5,5 mm) 1,6° (9,0 mm)
> 400 ≤ 630 0,5° (4,0 mm) 0,8° (7,0 mm) 0,8° (7,0 mm) 1,2° (11,0 mm)
Table 6 — Draft angles for investment casting
Grade A (DA) Grade B (DB)
Nominal height range
of feature for draft
External Internal External Internal
value
draft value draft value draft value 2 draft value 2
— ≤ 4 5,7° (0,2 mm) 5,7° (0,2 mm) 5,7° (0,2 mm) 8,5° (0,3 mm)
> 4 ≤ 6,3 2,2° (0,2 mm) 2,2° (0,2 mm) 2,2° (0,2 mm) 3,3° (0,3 mm)
> 6,3 ≤ 10 1,4° (0,2 mm) 1,4° (0,2 mm) 1,4° (0,2 mm) 2,8° (0,4 mm)
> 10 ≤ 16 0,9° (0,2 mm) 1,3° (0,3 mm) 1,3° (0,3 mm) 1,8° (0,4 mm)
> 16 ≤ 25 0,8° (0,3 mm) 1,1° (0,4 mm) 1,1° (0,4 mm) 1,4° (0,5 mm)
> 25 ≤ 40 0,5° (0,3 mm) 0,7° (0,4 mm) 0,7° (0,4 mm) 1,1° (0,6 mm)
> 40 ≤ 63 0,5° (0,4 mm) 0,6° (0,5 mm) 0,6° (0,5 mm) 0,8° (0,7 mm)
> 63 ≤ 100 0,3° (0,4 mm) 0,4° (0,6 mm) 0,4° (0,6 mm) 0,6° (0,8 mm)
> 100 ≤ 160 0,2° (0,5 mm) 0,3° (0,7 mm) 0,3° (0,7 mm) 0,4° (0,9 mm)
> 160 ≤ 250 0,2° (0,6 mm) 0,2° (0,8 mm) 0,2° (0,8 mm) 0,3° (1,0 mm)
> 250 ≤ 400 0,1° (0,7 mm) 0,2° (0,9 mm) 0,2° (0,9 mm) 0,2° (1,2 mm)
> 400 ≤ 630 0,1° (0,8 mm) 0,1° (1,0 mm) 0,1° (1,0 mm) 0,2° (1,5 mm)
NOTE The overall dimension rating is finer than in Tables 8 to 12 in order to avoid excess material.
ISO 8062-3:2023(E)
7 T olerance grades
7.1 Gener al
Before using general tolerances, it is necessary to investigate whether, for functional reasons, smaller
tolerances or, for economical reasons, larger tolerances are needed (see Annex C), i.e. the necessity to
specify individual tolerances.
Individual dimensional and geometrical tolerances shall be indicated according to the relevant GPS
standards on dimensional and geometrical tolerancing.
For drawings where the tolerances according to this document apply in a specified restrained condition
only, ISO 10579 shall be referred to on the drawing.
7.2 Dimensional castin g tolerance grades (DCTG)
Fifteen dimensional casting tolerance grades are defined and designated DCTG 1 to DCTG 15 (see
Table 7).
NOTE 1 For wall thicknesses, see Clause 9.
NOTE 2 This document does not cover general tolerances for angular dimensions. In the case of angular
dimensions, the nominal dimension can be converted into linear dimensions.
NOTE 3 Annex A gives recommendations for the application of the tolerance grades from Table 6.
As the default conditions for 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.
If agreed between the manufacturer and the customer for specific reasons, the casting tolerance may
be asymmetric. In such cases the casting tolerance shall be stated individually, according to ISO 129-1,
following the nominal dimensions of the final moulded part.
NOTE 4 In pressure die casting an asymmetric tolerance disposition is often applied because of special
technical reasons.
NOTE 5 In the case of a draft angle, the nominal dimension is modified by the draft angle (TP or TM).
ISO 8062-3:2023(E)
Table 7 — Linear dimensional casting tolerances (DCT)
Dimensions in millimetres
Linear dimensional tolerance
Nominal dimen-
a
for dimensional casting tolerance grade (DCTG)
sions related to the
moulded part b
DCTG 1 DCTG 2 DCTG 3 DCTG 4 DCTG 5 DCTG 6 DCTG 7 DCTG 8 DCTG 9 DCTG 10 DCTG 11 DCTG 12 DCTG 13 DCTG 14 DCTG 15 DCTG 15wt
– ≤ 10 0,09 0,13 0,18 0,26 0,36 0,52 0,74 1 1,5 2 2,8 4,2 – – – –
> 10 ≤ 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 ≤ 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 ≤ 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 ≤ 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 ≤ 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 ≤ 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 ≤ 250 – 0,24 0,34 0,5 0,7 1 1,4 2 2,8 4 5,6 8 11 14 18 22
> 250 ≤ 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 ≤ 630 – – – 0,64 0,9 1,2 1,8 2,6 3,6 5 7 10 14 18 22 28
> 630 ≤ 1 000 – – – – 1 1,4 2 2,8 4 6 8 11 16 20 25 32
> 1 000 ≤ 1 600 – – – – – 1,6 2,2 3,2 4,6 7 9 13 18 23 29 37
> 1 600 ≤ 2 500 – – – – – – 2,6 3,8 5,4 8 10 15 21 26 33 42
> 2 500 ≤ 4 000 – – – – – – – 4,4 6,2 9 12 17 24 30 38 49
> 4 000 ≤ 6 300 – – – – – – – – 7 10 14 20 28 35 44 56
> 6 300 ≤ 10 000 – – – – – – – – – 11 16 23 32 40 50 64
a
For wall thicknesses in grade DCTG 1 to DCTG 15, one grade coarser applies (see Clause 9).
b
Grade DCTG 15wt (wall thickness) exists only for wall thicknesses of castings generally specified to DCTG 15.

ISO 8062-3:2023(E)
7.3 Geometrical castin g tolerance grades (GCTG)
7.3.1 General
Seven geometrical casting tolerance grades (GCTG) are defined and designated GCTG 2 to GCTG 8 (see
Tables 8 to 11).
NOTE GCT values are not given for grade GCTG 1. This grade is reserved for finer values which might be
required in the future.
General tolerances on form (straightness of median lines, flatness, roundness) and on orientation
(parallelism, perpendicularity) do not apply to features with draft angle (taper). Where required, these
features shall have individually indicated tolerances according to the function and the manufacturer’s
advice.
Other geometrical tolerances than those given in Tables 8 to 11 (e.g. profile, position, combined zone
flatness) shall be indicated individually.
Therefore, it is recommended that information about the design of the mould regarding the location
of the parting surfaces and the amount of draft angle applied to the features is acquired from the
manufacturer in order to complete the drawing.
For tolerances of axes, the nominal length of the axis shall be taken. For tolerances of median surfaces,
the larger nominal length of the median surface shall be taken.
7.3.2 Nominal dimensions
The nominal dimension to be used in Tables 8 to 11 shall be the longest nominal dimension of the
considered 2D integral feature of the moulded part, disregarding the nominal dimension of non-
individually indicated fillets and chamfers (see examples in Annex E).
NOTE 1 Integral feature (see ISO 17450-1) means the real surface which can be touched physically. The
longest nominal dimension in the case of a cylinder is either diameter or length; in the case of a rectangular
planar surface it is the longest side.
NOTE 2 This definition is not applicable for 3D shapes, for example complex features.
NOTE 3 In certain cases, for example short cylinders or cones with large diameters, the resultant tolerance
can be unrealistic, therefore individual tolerancing will possibly be required.
7.3.3 Datums
7.3.3.1 Datums for gener al parallelism and perpendicularity tolerances
For general parallelism and perpendicularity tolerances according to this document, 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 3.
a) Option 1 b) Option 2
Figure 3 — Drawing indication options for the datum system for general parallelism and
perpendicularity tolerances according to this document
ISO 8062-3:2023(E)
NOTE This datum system does not apply to general geometrical tolerances on coaxiality and symmetry, see
7.3.3.2 and 7.3.3.3.
7.3.3.2 Datums for general coaxiality tolerances
For datums of general coaxiality tolerances the following applies:
— If one cylindrical feature (internal or external) extends over the whole length of all other cylindrical
coaxial features, this feature axis applies as the (single) datum, see Annex D, Figure D.1.
— Otherwise, a common datum applies, composed of the axes of the two most separated features on
the considered drawing centre line, see Annex D, Figure D.2. If more than one possibility exists (e.g.
inner or outer features), the feature with the largest diameter applies, see Annex D, Figure D.3.
The general tolerances for coaxiality apply also to the datum features themselves, if a common datum
applies.
7.3.3.3 Datums for gener al symmetry tolerances
For datums of general symmetry tolerances the following applies:
— 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, this feature median plane applies as the
(single) datum, see Annex D, Figure D.4.
— Otherwise, a common datum applies, composed of the median planes of the two most separated
features on the considered drawing centre line (plane), see Annex D, Figure D.5. If more than one
possibility exists, the feature with the largest size applies, see Annex D, Figure D.6. One of the two
datum features may be cylindrical, see Annex D, Figure D.7.
The general tolerances for symmetry apply also to the datum features themselves, if a common datum
applies.
Table 8 — Casting tolerances for straightness of median lines
Dimensions in millimetres
Nominal dimension Straightness tolerance
of the considered for geometrical casting tolerance grade (GCTG)
integral feature
GCTG 2 GCTG 3 GCTG 4 GCTG 5 GCTG 6 GCTG 7 GCTG 8
≤ 10 0,08 0,12 0,18 0,27 0,4 0,6 0,9
> 10 ≤ 30 0,12 0,18 0,27 0,4 0,6 0,9 1,4
> 30 ≤ 100 0,18 0,27 0,4 0,6 0,9 1,4 2
> 100 ≤ 300 0,27 0,4 0,6 0,9 1,4 2 3
> 300 ≤ 1 000 0,4 0,6 0,9 1,4 2 3 4,5
> 1 000 ≤ 3 000 — — — 3 4 6 9
> 3 000 ≤ 6 000 — — — 6 8 12 18
> 6 000 ≤ 10 000 — — — 12 16 24 36
ISO 8062-3:2023(E)
Table 9 — Casting tolerances for flatness
Dimensions in millimetres
Longest nominal Flatness tolerance
dimension of the for geometrical casting tolerance grade (GCTG)
considered integral
GCTG 2 GCTG 3 GCTG 4 GCTG 5 GCTG 6 GCTG 7 GCTG 8
feature
≤ 10 0,12 0,18 0,27 0,4 0,6 0,9 1,4
> 10 ≤ 30 0,18 0,27 0,4 0,6 0,9 1,4 2
> 30 ≤ 100 0,27 0,4 0,6 0,9 1,4 2 3
> 100 ≤ 300 0,4 0,6 0,9 1,4 2 3 4,5
> 300 ≤ 1 000 0,6 0,9 1,4 2 3 4,5 7
> 1 000 ≤ 3 000 — — — 4 6 9 14
> 3 000 ≤ 6 000 — — — 8 12 18 28
> 6 000 ≤ 10 000 — — — 16 24 36 56
Table 10 — Casting tolerances for roundness, parallelism, perpendicularity and symmetry
Dimensions in millimetres
Longest nominal Tolerance
dimension of the for geometrical casting tolerance grade (GCTG)
considered integral
GCTG 2 GCTG 3 GCTG 4 GCTG 5 GCTG 6 GCTG 7 GCTG 8
feature
≤ 10 0,18 0,27 0,4 0,6 0,9 1,4 2
> 10 ≤ 30 0,27 0,4 0,6 0,9 1,4 2 3
> 30 ≤ 100 0,4 0,6 0,9 1,4 2 3 4,5
> 100 ≤ 300 0,6 0,9 1,4 2 3 4,5 7
> 300 ≤ 1 000 0,9 1,4 2 3 4,5 7 10
> 1 000 ≤ 3 000 — — — 6 9 14 20
> 3 000 ≤ 6 000 — — — 12 18 28 40
> 6 000 ≤ 10 000 — — — 24 36 56 80
Table 11 — Casting tolerances for coaxiality (cylindrical tolerance zone)
Dimensions in millimetres
Longest nominal Coaxiality tolerance
dimension of the for geometrical casting tolerance grade (GCTG)
considered integral
GCTG 2 GCTG 3 GCTG 4 GCTG 5 GCTG 6 GCTG 7 GCTG 8
feature
≤ 10 0,27 0,4 0,6 0,9 1,4 2 3
> 10 ≤ 30 0,4 0,6 0,9 1,4 2 3 4,5
> 30 ≤ 100 0,6 0,9 1,4 2 3 4,5 7
> 100 ≤ 300 0,9 1,4 2 3 4,5 7 10
> 300 ≤ 1 000 1,4 2 3 4,5 7 10 15
> 1 000 ≤ 3 000 — — — 9 14 20 30
> 3 000 ≤ 6 000 — — — 18 28 40 60
> 6 000 ≤ 10 000 — — — 36 56 80 120
Other geometrical tolerances shall be indicated by individually indicated geometrical tolerances.
ISO 8062-3:2023(E)
8 Surfac e mismatch (SMI)
As default condition, the surface mismatch is controlled by the tolerances applied to linear dimensions
in accordance with Table 7, see Figure 4, therefore the surface mismatch may vary between zero and
the value given in Table 7, depending on the actual local sizes of the feature.
On features without draft angle, surface mismatch is also controlled and therefore included in form
tolerances for straightness, flatness and roundness, as applicable, given in Tables 8 to 10.
NOTE This is an overruling of the principle of independency. This is because it is often not known whether a
parting line exists and, if it does, whether the particular feature is affected.
Key
A surface mismatch
B lower limit of size
C upper limit of size
Figure 4 — Limitation of surface mismatch by linear dimension
If it is necessary to restrict further the value of the SMI, the maximum permissible SMI shall be stated
individually according to ISO 10135.
9 W all 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; for example, if there is a general tolerance on a
drawing of DCTG 10, the tolerance on wall thicknesses shall be DCTG 11.
10 R equired machining allowances (RMA)
10.1 Gener al
As a general condition, the specified RMAG according to this document (see Clause 11) applies for
the entire final moulded part, i.e. only one value is specified for all surfaces to be machined, and this
value shall be selected from the appropriate dimension range in accordance with the largest overall
dimension (see Table 12).
In sand casting, top surfaces might need more machining allowance than other surfaces. For these
surfaces coarser RMAGs can be selected. Individual machining allowances shall be indicated according
to ISO 1302.
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