SIST ISO 2768-1:1999

General tolerances -- Part 1: Tolerances for linear and angular dimensions without individual tolerance indications

This part is intended to simplify drawing indications and specifies general tolerances in four tolerance classes. It applies to the dimensions of workpieces that are produced by metal removal or are formed from sheet metal. It contains three tables and an informative annex with regard to concepts behind general tolerancing of dimensions.

Tolérances générales -- Partie 1: Tolérances pour dimensions linéaires et angulaires non affectées de tolérances individuelles

La présente partie de l'ISO 2768 vise à simplifier les dessins techniques et spécifie les tolérances générales pour les dimensions linéaires et angulaires sans indication de tolérances selon quatre classes de tolérance.   NOTE 1 -- Le concept du tolérancement général pour les dimensions linéaires et angulaires est décrit dans l'annexe A. Elle concerne les dimensions des pièces exécutées par enlèvement de métal ou des pièces exécutées en tôle.    NOTES
2 Ces tolérances peuvent être applicables également à des matériaux autres que le métal.
3 Des Normes internationales analogues existent, par exemple l'ISO 8062 pour les pièces moulées, ou pourront être établies par la suite. La présente partie de l'ISO 2768 est applicable exclusivement aux dimensions sans indication de tolérances individuelles suivantes :  
a) dimensions linéaires (par exemple dimensions extérieures, dimensions intérieures, dimensions de décrochements, diamètres, rayons, distances, rayons extérieurs et hauteurs de chanfrein pour arêtes abattues);  
b) dimensions angulaires, y compris les dimensions angulaires qui habituellement ne sont pas indiquées, par exemple angles droits (90 °), à moins qu'il soit fait référence à l'ISO 2768-2, ou angles de polygones réguliers;  
c) dimensions linéaires et angulaires obtenues par usinage de pièces assemblées.
La présente partie de l'ISO 2768 ne s'applique pas aux dimensions suivantes :
a) dimensions linéaires et angulaires dont les tolérances générales sont définies par référence à d'autres normes de tolérances générales;  
b) dimensions auxiliaires indiquées entre parenthèses;  
c) dimensions théoriquement exactes indiquées dans un cadre rectangulaire.

Splošne tolerance - 1. del: Tolerance dolžinskih in kotnih mer brez posebnih tolerančnih oznak

General Information

• Status: Published
• Publication Date: 31-Oct-1995
• ICS: 17.040.10 - Limits and fits
• Technical Committee: ISEL - Mechanical elements
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Mar-1999
• Due Date: 01-Mar-1999
• Completion Date: 01-Mar-1999
• Ref Project: ISO 2768-1:1989 - General tolerances — Part 1: Tolerances for linear and angular dimensions without individual tolerance indications

Relations

• Revised: ISO 2768:1973 - Permissible machining variations in dimensions without tolerance indication
• Effective Date: 12-May-2008

Standards Content (Sample)

МЕЖДУНАРОДНЫЙ ISO

2768-1
СТАНДАРТ

Первое издание

1989-11-15



Допуски общие

Часть 1:
Допуски на линейные и угловые размеры без
указания допусков на отдельные размеры

General tolerances -

Part 1 –
Tolerances for linear and angular dimensions
without individual tolerance indications















Ссылочный номер

ISO 2768-1:1989

---------------------- Page: 1 ----------------------
ISO 2768-1:1989
Предисловие

Международная организация по стандартизации (ISO) является всемирной федерацией национальных
организаций по стандартизации (комитетов-членов ISO). Разработка международных стандартов
обычно осуществляется техническими комитетами ISO. Каждый комитет-член ISO, заинтересованный в
деятельности, для которой был создан технический комитет, имеет право быть представленным в этом
комитете. Международные организации, правительственные и неправительственные, имеющие связи с
ISO, также принимают участие в работах. ISO непосредственно сотрудничает с Международной
электротехнической комиссией (IEC) по всем вопросам электротехнической стандартизации.

Проекты международных стандартов, одобренные техническими комитетами, рассылаются
комитетам-членам на голосование. Их опубликование в качестве международных стандартов требует
одобрения, по меньшей мере, 75% комитетов-членов, принимающих участие в голосовании.

Международный стандарт ISO 2768-1 разработан Техническим комитетом ISO/ТC 3 «Допуски и посадки».

Настоящее первое издание ISO 2768-1 наряду с ISO 2768-2:1989 отменяет и заменяет ISO 2768:1973.

ISO 2768 состоит из следующих частей под общим названием Допуски общие:

- Часть 1: Допуски на линейные и угловые размеры без указания допусков на отдельные
размеры

- Часть 2: Геометрические допуски для деталей без указания допусков на отдельные
размеры

Приложение А данной части ISO 2768 дано только для информации.





ii

---------------------- Page: 2 ----------------------
ISO 2768-1:1989
Введение

Все элементы детали всегда имеют определенные размеры и определенную геометрическую форму.
Работа детали требует, чтобы отклонения размера и отклонения, относящиеся к геометрическим
особенностям (форма, ориентация, положение), имели бы определенный предел, превышение
которого мешает работе.

Установление допусков на чертеже должно быть полным, чтобы быть уверенным в том, что все
размерные и геометрические аспекты всех элементов ограничены, т.е. что ничто не должно
подразумеваться или оставаться для оценки персонала мастерской или отдела технического
контроля.

Применение размерных и общих геометрических допусков гарантирует соблюдение этого
предварительного условия.

iii

---------------------- Page: 3 ----------------------
МЕЖДУНАРОДНЫЙ СТАНДАРТ    ISO 2768-1:1989
Допуски общие

Часть 1:
Допуски на линейные и угловые размеры без указания допусков на
отдельные размеры

1 Область применения

Целью настоящей части стандарта ISO 2768 является упрощение технических чертежей и
спецификация общих допусков для линейных и угловых размеров без указания допусков
соответственно четырем классам допусков.

ПРИМЕЧАНИЕ 1 – Понятие установленных общих допусков для линейных и угловых размеров описано в
приложении А.

Стандарт относится к размерам деталей, выполненных посредством снятия металла или деталей,
изготовленных из листового металла.

ПРИМЕЧАНИЯ:

2 Эти допуски могут быть также применимы к материалам, отличным от металлов.

1)
3 Существуют аналогичные международные стандарты, например, ISO 8062 для отливок, или
планируются к разработке.

Настоящая часть ISO 2768 применима исключительно к размерам без указания следующих
индивидуальных допусков:

а) линейные допуски (например, габаритные размеры, внутренние размеры, размеры
расцепки, диаметры, радиусы, промежутки, внешние радиусы и высоты фаски для скошенных
кромок);

b) угловые размеры, включая угловые размеры, которые обычно не указываются,
например, прямые углы (90°), если не дается ссылка на ISO 2768-2, или углы правильного
многоугольника;

с) линейные и угловые размеры, полученные при использовании сборных деталей.

Настоящая часть ISO 2768 не применяется к следующим размерам:

а) линейные и угловые размеры, у которых общий допуск определяется ссылкой на
другие стандарты, относительно допуска на свободные размеры;

b) дополнительные размеры, указанные в скобках;

с) теоретические точные размеры, указанные в прямоугольной рамке.

1)
ISO 8062:1984, Отливки. Система допусков на размеры

1

---------------------- Page: 4 ----------------------
ISO 2768-1:1989
2 Общие положения

При выборе данного класса допуска следует учитывать точность, обычную для мастерской. Если
требуются более узкие допуски, или, если допустимы более широкие допуски и более экономные для
какого-либо отдельного элемента, их следует изобразить на чертеже вслед за соответствующим
номинальным размером.

Общие допуски для линейных и угловых размеров применяются, когда чертежи или
соответствующие спецификации имеют ссылки на настоящую часть стандарта ISO 2768, в
соответствии с разделами 4 и 5. Если существуют общие допуски для деталей, выполненных другими
способами, указанными в других международных стандартах, следует сделать на них ссылку на
чертежах или в соответствующих спецификациях. Когда не имеется индивидуального допуска,
указанного для размера, между поверхностью, обработанной начисто, и необработанной
поверхностью, например, в случае необработанной литой детали или кованой детали, используется
наибольший из двух общих допусков, например, ISO 8062 для отливок.

3 Нормативные документы

Следующие стандарты содержат положения, которые посредством ссылки в этом тексте составляют
положения данной части международного стандарта ISO 2768. К моменту публикации данного
стандарта указанные издания были действительны. Все стандарты подлежат пересмотру, и
участникам соглашений, основанных на данной части международного стандарта ISO 2768, следует
изыскать возможность применения самых последних изданий указанных ниже стандартов. Члены IEC
и ISO имеют указатели действующих в настоящее время международных стандартов.

ISO 2768-2:1989, Допуски общие. Часть 2: Геометричес
...

INTERNATIONAL
ISO
STANDARD 27684
First edition
1989-11-15
General tolerantes -
Part 1:
Tolerantes for linear and angular dimensions without
individual tolerante indications
Tolhrances ghhales -
Partie I : Tolhrances pour dimensions fin4aires et angulaires non affectdes de
tolhrances individuelles
.
Reference number
ISO 2768-1 : 1989 (E)

---------------------- Page: 1 ----------------------
ISO 2768-1 : 1989 (EI
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of
national Standards bodies (ISO member bedies). The work of preparing International
Standards is normally carried out through ISO technical committees. Esch 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, govern-
mental 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.
Draft International Standards adopted by the technical committees are circulated to
the member bodies for approval before their acceptance as International Standards by
the ISO Council. They are approved in accordance with ISO procedures requiring at
least 75 % approval by the member bodies voting.
ISO 2768- prepared
International Standard 1 was Technical Committee ISO/TC 3,
bY
Limits and fits.
This first edition of ISO 2768-1, together with ISO 2768-2 : 1989, cancel and replace
ISO 2768 : 1973.
ISO 2768 consists of the following Parts, under the general title General tolerantes:
- Part 7 : Tolerantes for linear and angular dimensions withou t individual
tolerante indica tions
- Part 2: Geome trical tolerantes for fea tures without individual tolerante indi-
ca tions
Annex A of this part of ISO 2768 is for information only.
0 ISO 1989
All rights reserved. No patt of this pubiication may be reproduced or utilized in any form or by any
means, electronie or mechanical, including photocopying and microfilm, without Permission in
writing from the publisher.
International Organization for Standardization
Case postale 56 l CH-121 1 Geneve 20 l Switzerland
Printed in Switzerland
ii

---------------------- Page: 2 ----------------------
ISO27684 :1989 (E)
Introduction
All features on component Parts always have a size and a geometrical shape. For
the deviation of size and for the deviations of the geometrical characteristics (form,
orientation and location) the function of the part requires Iimitations which, when
exceeded, impair this function.
The tolerancing on the drawing should be complete to ensure that the elements of size
and geometry of all features are controlled, i.e. nothing shall be implied or left to judge-
ment in the Workshop or in the inspection department.
The use of general tolera for size and geometry simplifies the task of ensuring that
this prerequisite is met.

---------------------- Page: 3 ----------------------
This page intentionally left blank

---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD ISO2768-1 : 1989 (EI
General tolerantes -
Part 1 I
Tolerantes for linear and angular dimensions without individual _
tolerante indications
1 Scope 2 General
This part of ISO 2768 is intended to simplify drawing indica-
When selecting the tolerante class, the respective customary
tions and it specifies general tolerantes for linear and angular
Workshop accuracy has to be taken into consideration. If smal-
dimensions without individual tolerante indications in four tol- ler tolerantes are required or larger tolerantes are permissible
erance classes.
and more economical for any individual feature, such toleran-
ces should be indicated adjacent to the relevant nominal dimen-
NOTE 1 - The concepts behind the general tolerancing of linear and sion(s).
angular dimensions are described in annex A.
General tolerantes for linear and angular dimensions apply’
lt applies to the dimensions of Parts that are produced by metal when drawings or associated specifications refer to this patt of
removal or Parts that are formed from sheet metal. ISO 2768 in accordance with clauses 4 and 5. If there are gen-
eral toierances for other processes, as specified in other lnter-
national Standards, reference shall be made to them on the
NOTES
drawings or associated specifications. For a dimension
2 These tolerantes may be suitable for use with materials other than
between an unfinished and a finished surface, e.g. of cast or
metal.
forged Patts, for which no individual tolerante is directly indi-
cated, the larger of the two general tolerantes in question
3 Parallel International Standards exist or are planned, e.g. see
applies, e.g. for castings, see ISO 80621).
ISO 80621) for castings.
This patt of ISO 2768 only applies for the following dimensions
3 Normative references
which do not have an individual tolerante indication :
The following Standards contain provisions which, through
a) linear dimensions (e-g. extemal sizes, internal sizes,
reference in this text, constitute provisions of this patt of
step sizes, diameters, radii, distances, extemal radii and
ISO 2768. At the time of publication, the editions indicated
chamfer heights for broken edges);
were valid. All Standards are subject to revision, and Parties to
agreements based on this patt of ISO 2768 are encouraged to
b) angular dimensions, including angular dimensions
investigate the possibility of applying the most recent editions
usually not indicated, e.g. right angles No), unless ref-
of the Standards indicated below. Members of IEC and ISO
erence to ISO 2768-2 is made, or angles of uniform poly-
maintain registers of currently valid International Standards.
gons;
ISO 2768-2 : 1909, General tolerantes - Part 2: Geometrical
c) linear and angular dimensions produced by machining
tolerantes for features without individual tolerante indications.
assembled Parts.
ISO 8015 : 1985, Technical drawings - Fundamental toleran-
It does not apply for the following dimensions :
cing principle.
a) linear and angular dimensions which are covered by
reference to other Standards on general tolerantes;
4 General tolerantes
b) auxiliary dimensions indicated in brackets;
4.1 Linear dimensions
c) theoretically exact dimensions indicated in rectangular General tolerantes for linear dimensions are given in tables 1
f rames. and 2.
System of dimensional tolerantes.
3) ISO 8062 : 1984, Castings -

---------------------- Page: 5 ----------------------
ISO 2768-1 : 1989 (EI
“ISO 2768”;
4.2 Angular dimensions a)
General tolerantes specified in angular units control only the
b) the tolerante class in accordance with this part of
general orientation of lines or line elements of surfaces, but not
ISO 2768.
their form deviations.
EXAMPLE
The general orientat
...

SLOVENSKI STANDARD
SIST ISO 2768-1:199
01-QRYHPEHU-199
6SORãQHWROHUDQFHGHO7ROHUDQFHGROåLQVNLKLQNRWQLKPHUEUH]SRVHEQLK
WROHUDQþQLKR]QDN
General tolerances -- Part 1: Tolerances for linear and angular dimensions without
individual tolerance indications
Tolérances générales -- Partie 1: Tolérances pour dimensions linéaires et angulaires non
affectées de tolérances individuelles
Ta slovenski standard je istoveten z: ISO 2768-1:1989
ICS:
17.040.10 Tolerance in ujemi Limits and fits
SIST ISO 2768-1:199 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

SIST ISO 2768-1:1995

---------------------- Page: 2 ----------------------

SIST ISO 2768-1:1995
INTERNATIONAL
ISO
STANDARD 27684
First edition
1989-11-15
General tolerantes -
Part 1:
Tolerantes for linear and angular dimensions without
individual tolerante indications
Tolhrances ghhales -
Partie I : Tolhrances pour dimensions fin4aires et angulaires non affectdes de
tolhrances individuelles
.
Reference number
ISO 2768-1 : 1989 (E)

---------------------- Page: 3 ----------------------

SIST ISO 2768-1:1995
ISO 2768-1 : 1989 (EI
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of
national Standards bodies (ISO member bedies). The work of preparing International
Standards is normally carried out through ISO technical committees. Esch 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, govern-
mental 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.
Draft International Standards adopted by the technical committees are circulated to
the member bodies for approval before their acceptance as International Standards by
the ISO Council. They are approved in accordance with ISO procedures requiring at
least 75 % approval by the member bodies voting.
ISO 2768- prepared
International Standard 1 was Technical Committee ISO/TC 3,
bY
Limits and fits.
This first edition of ISO 2768-1, together with ISO 2768-2 : 1989, cancel and replace
ISO 2768 : 1973.
ISO 2768 consists of the following Parts, under the general title General tolerantes:
- Part 7 : Tolerantes for linear and angular dimensions withou t individual
tolerante indica tions
- Part 2: Geome trical tolerantes for fea tures without individual tolerante indi-
ca tions
Annex A of this part of ISO 2768 is for information only.
0 ISO 1989
All rights reserved. No patt of this pubiication may be reproduced or utilized in any form or by any
means, electronie or mechanical, including photocopying and microfilm, without Permission in
writing from the publisher.
International Organization for Standardization
Case postale 56 l CH-121 1 Geneve 20 l Switzerland
Printed in Switzerland
ii

---------------------- Page: 4 ----------------------

SIST ISO 2768-1:1995
ISO27684 :1989 (E)
Introduction
All features on component Parts always have a size and a geometrical shape. For
the deviation of size and for the deviations of the geometrical characteristics (form,
orientation and location) the function of the part requires Iimitations which, when
exceeded, impair this function.
The tolerancing on the drawing should be complete to ensure that the elements of size
and geometry of all features are controlled, i.e. nothing shall be implied or left to judge-
ment in the Workshop or in the inspection department.
The use of general tolera for size and geometry simplifies the task of ensuring that
this prerequisite is met.

---------------------- Page: 5 ----------------------

SIST ISO 2768-1:1995
This page intentionally left blank

---------------------- Page: 6 ----------------------

SIST ISO 2768-1:1995
INTERNATIONAL STANDARD ISO2768-1 : 1989 (EI
General tolerantes -
Part 1 I
Tolerantes for linear and angular dimensions without individual _
tolerante indications
1 Scope 2 General
This part of ISO 2768 is intended to simplify drawing indica-
When selecting the tolerante class, the respective customary
tions and it specifies general tolerantes for linear and angular
Workshop accuracy has to be taken into consideration. If smal-
dimensions without individual tolerante indications in four tol- ler tolerantes are required or larger tolerantes are permissible
erance classes.
and more economical for any individual feature, such toleran-
ces should be indicated adjacent to the relevant nominal dimen-
NOTE 1 - The concepts behind the general tolerancing of linear and sion(s).
angular dimensions are described in annex A.
General tolerantes for linear and angular dimensions apply’
lt applies to the dimensions of Parts that are produced by metal when drawings or associated specifications refer to this patt of
removal or Parts that are formed from sheet metal. ISO 2768 in accordance with clauses 4 and 5. If there are gen-
eral toierances for other processes, as specified in other lnter-
national Standards, reference shall be made to them on the
NOTES
drawings or associated specifications. For a dimension
2 These tolerantes may be suitable for use with materials other than
between an unfinished and a finished surface, e.g. of cast or
metal.
forged Patts, for which no individual tolerante is directly indi-
cated, the larger of the two general tolerantes in question
3 Parallel International Standards exist or are planned, e.g. see
applies, e.g. for castings, see ISO 80621).
ISO 80621) for castings.
This patt of ISO 2768 only applies for the following dimensions
3 Normative references
which do not have an individual tolerante indication :
The following Standards contain provisions which, through
a) linear dimensions (e-g. extemal sizes, internal sizes,
reference in this text, constitute provisions of this patt of
step sizes, diameters, radii, distances, extemal radii and
ISO 2768. At the time of publication, the editions indicated
chamfer heights for broken edges);
were valid. All Standards are subject to revision, and Parties to
agreements based on this patt of ISO 2768 are encouraged to
b) angular dimensions, including angular dimensions
investigate the possibility of applying the most recent editions
usually not indicated, e.g. right angles No), unless ref-
of the Standards indicated below. Members of IEC and ISO
erence to ISO 2768-2 is made, or angles of uniform poly-
maintain registers of currently valid International Standards.
gons;
ISO 2768-2 : 1909, General tolerantes - Part 2: Geometrical
c) linear and angular dimensions produced by machining
tolerantes for features without individual tolerante indications.
assembled Parts.
ISO 8015 : 1985, Technical drawings - Fundamental toleran-
It does not apply for the following dimensions :
cing principle.
a) linear and angular dimensions which are covered by
reference to other Standards on general tolerantes;
4 General tolerantes
b) auxiliary dimensions indicated in brackets;
4.1 Linear dimensions
c) theoretically exact dimensions indicated in rectangu
...

SLOVENSKI STANDARD
SIST ISO 2768-1:1999
01-marec-1999
6SORãQHWROHUDQFHGHO7ROHUDQFHGROåLQVNLKLQNRWQLKPHUEUH]SRVHEQLK
WROHUDQþQLKR]QDN
General tolerances -- Part 1: Tolerances for linear and angular dimensions without
individual tolerance indications
Tolérances générales -- Partie 1: Tolérances pour dimensions linéaires et angulaires non
affectées de tolérances individuelles
Ta slovenski standard je istoveten z: ISO 2768-1:1989
ICS:
17.040.10 Tolerance in ujemi Limits and fits
SIST ISO 2768-1:1999 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

INTERNATIONAL
ISO
STANDARD 27684
First edition
1989-11-15
General tolerantes -
Part 1:
Tolerantes for linear and angular dimensions without
individual tolerante indications
Tolhrances ghhales -
Partie I : Tolhrances pour dimensions fin4aires et angulaires non affectdes de
tolhrances individuelles
.
Reference number
ISO 2768-1 : 1989 (E)

---------------------- Page: 2 ----------------------

ISO 2768-1 : 1989 (EI
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of
national Standards bodies (ISO member bedies). The work of preparing International
Standards is normally carried out through ISO technical committees. Esch 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, govern-
mental 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.
Draft International Standards adopted by the technical committees are circulated to
the member bodies for approval before their acceptance as International Standards by
the ISO Council. They are approved in accordance with ISO procedures requiring at
least 75 % approval by the member bodies voting.
ISO 2768- prepared
International Standard 1 was Technical Committee ISO/TC 3,
bY
Limits and fits.
This first edition of ISO 2768-1, together with ISO 2768-2 : 1989, cancel and replace
ISO 2768 : 1973.
ISO 2768 consists of the following Parts, under the general title General tolerantes:
- Part 7 : Tolerantes for linear and angular dimensions withou t individual
tolerante indica tions
- Part 2: Geome trical tolerantes for fea tures without individual tolerante indi-
ca tions
Annex A of this part of ISO 2768 is for information only.
0 ISO 1989
All rights reserved. No patt of this pubiication may be reproduced or utilized in any form or by any
means, electronie or mechanical, including photocopying and microfilm, without Permission in
writing from the publisher.
International Organization for Standardization
Case postale 56 l CH-121 1 Geneve 20 l Switzerland
Printed in Switzerland
ii

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ISO27684 :1989 (E)
Introduction
All features on component Parts always have a size and a geometrical shape. For
the deviation of size and for the deviations of the geometrical characteristics (form,
orientation and location) the function of the part requires Iimitations which, when
exceeded, impair this function.
The tolerancing on the drawing should be complete to ensure that the elements of size
and geometry of all features are controlled, i.e. nothing shall be implied or left to judge-
ment in the Workshop or in the inspection department.
The use of general tolera for size and geometry simplifies the task of ensuring that
this prerequisite is met.

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INTERNATIONAL STANDARD ISO2768-1 : 1989 (EI
General tolerantes -
Part 1 I
Tolerantes for linear and angular dimensions without individual _
tolerante indications
1 Scope 2 General
This part of ISO 2768 is intended to simplify drawing indica-
When selecting the tolerante class, the respective customary
tions and it specifies general tolerantes for linear and angular
Workshop accuracy has to be taken into consideration. If smal-
dimensions without individual tolerante indications in four tol- ler tolerantes are required or larger tolerantes are permissible
erance classes.
and more economical for any individual feature, such toleran-
ces should be indicated adjacent to the relevant nominal dimen-
NOTE 1 - The concepts behind the general tolerancing of linear and sion(s).
angular dimensions are described in annex A.
General tolerantes for linear and angular dimensions apply’
lt applies to the dimensions of Parts that are produced by metal when drawings or associated specifications refer to this patt of
removal or Parts that are formed from sheet metal. ISO 2768 in accordance with clauses 4 and 5. If there are gen-
eral toierances for other processes, as specified in other lnter-
national Standards, reference shall be made to them on the
NOTES
drawings or associated specifications. For a dimension
2 These tolerantes may be suitable for use with materials other than
between an unfinished and a finished surface, e.g. of cast or
metal.
forged Patts, for which no individual tolerante is directly indi-
cated, the larger of the two general tolerantes in question
3 Parallel International Standards exist or are planned, e.g. see
applies, e.g. for castings, see ISO 80621).
ISO 80621) for castings.
This patt of ISO 2768 only applies for the following dimensions
3 Normative references
which do not have an individual tolerante indication :
The following Standards contain provisions which, through
a) linear dimensions (e-g. extemal sizes, internal sizes,
reference in this text, constitute provisions of this patt of
step sizes, diameters, radii, distances, extemal radii and
ISO 2768. At the time of publication, the editions indicated
chamfer heights for broken edges);
were valid. All Standards are subject to revision, and Parties to
agreements based on this patt of ISO 2768 are encouraged to
b) angular dimensions, including angular dimensions
investigate the possibility of applying the most recent editions
usually not indicated, e.g. right angles No), unless ref-
of the Standards indicated below. Members of IEC and ISO
erence to ISO 2768-2 is made, or angles of uniform poly-
maintain registers of currently valid International Standards.
gons;
ISO 2768-2 : 1909, General tolerantes - Part 2: Geometrical
c) linear and angular dimensions produced by machining
tolerantes for features without individual tolerante indications.
assembled Parts.
ISO 8015 : 1985, Technical drawings - Fundamental toleran-
It does not apply for the following dimensions :
cing principle.
a) linear and angular dimensions which are covered by
reference to other Standards on general tolerantes;
4 General tolerantes
b) auxiliary dimensions indicated in brackets;
4.1 Linear dimensions
c) theoretically exact dimensions indicated in rectangular General tolerantes for linear dimensions are given in tables 1
f ram
...

NORME
IS0
INTERNATIONALE
2768-l
Premi&e bdition
1989-11-15
Tokances g&&ales -
Partie 1 :
ToErances pour dimensions Maires et angulaires
non affectbes de tolhances individuelles
General tolerances -
Part I : Tolerances for linear and angular dimensions without individual tolerance
indications
Numi!ro de ref&-ence
IS0 2768-l : 1989 IF)

---------------------- Page: 1 ----------------------
IS0 2768-l : 1989 (F)
Avant-propos
L ’ISO (Organisation internationale de normalisation) est une federation mondiale
d ’organismes nationaux de normalisation (comites membres de I ’ISO). L ’elaboration
des Normes internationales est en general confide aux comites techniques de I ’ISO.
Chaque comite membre interesse par une etude a le droit de faire partie du comite
technique tree a cet effet. Les organisations internationales, gouvernementales et non
gouvernementales, en liaison avec I ’ISO participent egalement aux travaux. L ’ISO col-
labore etroitement avec la Commission electrotechnique internationale (CEI) en ce qui
concerne la normalisation electrotechnique.
Les projets de Normes internationales adopt& par les comites techniques sont soumis
aux comites membres pour approbation, avant leur acceptation comme Normes inter-
nationales par le Conseil de I ’ISO. Les Normes internationales sont approuvees confor-
mement aux procedures de I ’ISO qui requierent I ’approbation de 75 % au moins des
comites membres votants.
La Norme internationale IS0 2768-l a ete elaboree par le comite technique ISO/TC 3,
Ajustements.
Cette premiere edition de I ’ISO 2768-l ainsi que I ’ISO 2768-2 : 1989 annulent et rempla-
cent I ’ISO 2768 : 1973.
L ’ISO 2768 comprend les parties suivantes, presentees sous le titre general Tolkances
g&&ales :
- Partie 7: Tolhrances pour dimensions lineaires et angulaires non affect&es de
tole ’rances individuelles
- Partie 2: Tolbrances ghomktriques pour &!ments non affect& de tolhrances
individuelles
L ’annexe A de la presente partie de I ’ISO 2768 est donnee uniquement a titre d ’infor-
mation.
0 IS0 1989
Droits de reproduction r&en&k. Aucune partie de cette publication ne peut etre reproduite ni
utilisee sous quelque forme que ce soit et par aucun procede, electronique ou mecanique,
y compris la photocopie et les microfilms, sans I ’accord ecrit de I ’editeur.
Organisation internationale de normalisation
Case postale 56 l CH-1211 Geneve 20 l Suisse
Imprime en Suisse
ii

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IS0 2768-l : 1989 (F)
Introduction
Tous les Mments d ’un composant ont toujours une dimension et une forme geombtri-
que. La fonction de I ’Mment nkessite que les &arts dimensionnels et les &carts rela-
tifs aux caractkistiques g6ometriques (forme, orientation et position) aient une limite
qui, si elle est depasshe, nuit B la fonction.
Le toI&-ancement sur le dessin devrait 6tre complet afin d ’assurer que les aspects
dimensionnels et g6ometriques de tous les Gments sont limit&, c ’est-A-dire que rien
ne doit 6tre sous-entendu ni laiss6 B I ’apprkiation du personnel d ’atelier ou du service
de contr6le.
L ’application des tokrances gh%ales dimensionnelles et g6ometriques garantit le res-
pect de cette condition prhalable.
. . .
III

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IS027684 : 1989 (F)
NORME INTERNATIONALE
Tokrances g&Wales -
Partie 1 :
ToErances pour dimensions Maires et angulaires non affectees
de tolkrances individuelles
1 Domaine d ’application 2 G6n6ralit6s
La presente partie de I ’ISO 2768 vise a simplifier les dessins Le choix d ’une classe de tolerance donnee doit tenir compte de
techniques et specific les tolerances g&&ales pour les dimen-
la precision habituelle de I ’atelier. Si des tolerances plus serrees
sions lineaires et angulaires sans indication de tolerances selon sont necessaires, ou si des tolerances plus larges sont admissi-
quatre classes de tolerance.
bles et plus economiques pour un element individuel quelcon-
que, il convient de les faire figurer a la suite de la dimension
NOTE 1 - Le concept du tokancement g&%-al pour les dimensions
nominale concernee.
Maires et angulaires est dhcrit dans l ’annexe A.
Les tolerances generales pour les dimensions lineaires et angu-
Elle concerne les dimensions des pieces executees par enleve-
laires s ’appliquent lorsque les dessins ou les specifications cor-
ment de metal ou des pieces executees en tale.
respondantes font reference % la presente par-tie de I ’ISO 2768
NOTES conformement aux articles 4 et 5. S ’il existe des tolerances
generales, pour les pieces executees par d ’autres procedes,
2 Ces tolhrances peuvent 6tre applicables 6galement ZI des matkriaux
specifiees dans d ’autres Normes internationales, il doit leur etre
autres que le m&al.
fait reference sur les dessins ou les specifications correspon-
3 Des Normes internationales analogues existent, par exemple
dantes. Lorsqu ’il n ’y a pas de tolerance individuelle indiquee
I ’ISO 80621) pour les pikes moukes, ou pourront 6tre ktablies par la
pour une dimension entre une surface finie et une surface
suite.
brute, par exemple dans le cas d ’une piece brute de fonderie ou
d ’une piece de forge, la plus grande des deux tolerances gene-
La presente par-tie de I ’ISO 2768 est applicable exclusivement
rales s ’applique, par exemple I ’ISO 8062 pour les pieces mou-
aux dimensions sans indication de tolerances individuelles sui-
lees.
vantes :
a) dimensions Iineaires (par exemple dimensions exterieu-
res, dimensions interieures, dimensions de decrochements,
diametres, rayons, distances, rayons exterieurs et hauteurs
3 Rhfhences normatives
de chanfrein pour a&es abattues);
b) dimensions angulaires, y compris les dimensions angu-
Les normes suivantes contiennent des dispositions qui, par
laires qui habituellement ne sont pas indiquees, par exemple
suite de la reference qui en est faite, constituent des disposi-
angles droits (90 O), a moins qu ’il soit fait reference a
tions valables pour la presente pat-tie de I ’ISO 2768. Au moment
I ’ISO 2768-2, ou angles de polygones reguliers;
de la publication, les editions indiquees etaient en vigueur.
Toute norme est sujette a revision et les parties prenantes des
c) dimensions Iineaires et angulaires obtenues par usinage
accords fond& sur la presente partie de I ’ISO 2768 sont invi-
de pieces assemblees.
tees a rechercher la possibilite d ’appliquer les editions les plus
recentes des normes indiquees ci-apres. Les membres de la CEI
La presente pat-tie de I ’ISO 2768 ne s ’applique pas aux dimen-
et de I ’ISO possedent le registre des Normes internationales en
sions suivantes:
vigueur a un moment donne.
a) dimensions lineaires et angulaires dont les tolerances
generales sont definies par reference a d ’autres normes de I SO 2768-2 : I 989, Tokrances g&n&ales - Partie 2: ToEran-
tolerances generales;
ces g&om&riques pour Mments non affect& de tokances
individuelles .
b) dimensions auxiliaires indiquees entre parentheses;
IS0 8015 : 1985, Dessins techniques - Principe de tolkance-
c) dimensions theoriquement exactes indiquees dans un
cadre rectangulaire. ment de base.
1) IS0 8062 : 1984, P&es mouh?es - Syst&me de tolhrances dimensionnelles.
1

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IS0 2768-I : 1989 (F)
5 Indications sur les dessins
4 Tokances ghkales
Si les tokances g&$-ales conformes 3 la pr&ente partie de
4.1 Dimensions lin$aires
I ’ISO 2768 doivent s ’appliquer, les indications suivantes doivent
apparaitre dans ou pr&s du cartouche du d
...