SIST ISO 2768-2:1999
(Main)General tolerances -- Part 2: Geometrical tolerances for features without individual tolerance indications
General tolerances -- Part 2: Geometrical tolerances for features without individual tolerance indications
This part is intended to simplify drawing indications and specifies general tolerances in three tolerance classes. It mainly applies to features which are produced by removal of material. It contains tour tables and an informative annex A with regard to concepts behind general tolerancing of dimensions, as well as an informative annex B with further information.
Tolérances générales -- Partie 2: Tolérances géométriques pour éléments non affectés de tolérances individuelles
La présente partie de l'ISO 2768 vise à simplifier les indications devant figurer sur les dessins et prescrit les tolérances géométriques générales applicables aux éléments du dessin qui ne font pas l'objet d'un tolérancement individuel. Elle prescrit des tolérances géométriques générales regroupées en trois classes de tolérance. La présente partie de l'ISO 2768 est applicable principalement aux éléments exécutés par enlèvement de matière. Son application à des éléments obtenus par d'autres procédés de fabrication est possible ; néanmoins, cela nécessite un contrôle supplémentaire pour déterminer si la précision habituelle de l'atelier demeure dans les limites des tolérances géométriques générales prescrites dans la présente partie de l'ISO 2768.
Splošne tolerance - 2. del: Tolerance geometrijskih značilnosti brez posebnih tolerančnih oznak
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МЕЖДУНАРОДНЫЙ ISO
СТАНДАРТ 2768-2
Первое издание
1989-11-15
Допуски общие.
Часть 2.
Геометрические допуски для деталей без
указания допусков на отдельные размеры
General tolerances
Part 2: Geometrical tolerances for features without individual
tolerance indications
Ответственность за подготовку русской версии несёт GOST R
(Российская Федерация) в соответствии со статьёй 18.1 Устава ISO
Ссылочный номер
ISO 2768-2:1989
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ISO 2768-2:1989
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ISO 2768-2:1989
Предисловие
ISO (Международная организация по стандартизации) представляет собой всемирную федерацию
национальных организаций по стандартизации (члены-комитеты ISO). Разработка международных
стандартов в общем случае представляется рабочим комитетом ISO. Каждый член-комитет,
заинтересованный в исследовании, имеет право участвовать в работе Рабочего комитета, созданного
с этой целью. Совместно с ISO в этой работе принимают участие также и Международные
организации, как правительственные, так и неправительственные. В области электротехнической
стандартизации ISO тесно сотрудничает с Международной электротехнической комиссией (IEC).
Проекты международных стандартов рассылаются на утверждение членам-комитетам перед их
принятием в качестве международных стандартов Советом ISO. Международные стандарты
утверждаются согласно процедурам ISO, где требуется не менее 75 % голосующих за принятие
данного стандарта членов-комитетов.
Международный стандарт ISO 2768-2 был разработан рабочим комитетом ISO/ТС 3, Посадки и
допуски.
Данное первое издание ISO 2768-2, а также ISO 2768-1:1989 аннулируют и заменяют стандарт
ISO 2768:1973.
Стандарт ISO 2768 состоит из следующих частей, объединенных общим названием Общие допуски.
- 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
Приложения А и В данной части стандарта ISO 2768 имеют только информативный характер.
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ISO 2768-2:1989
Введение
Все элементы детали всегда имеют размеры и геометрическую форму. Функция элемента требует
того, чтобы отступление от размеров и отклонения, относящиеся к геометрическим характеристикам
(форма, ориентация и положение) имели предел, за которым функция элемента нарушается.
Указание допусков на чертеже должно быть полным, чтобы обеспечить пространственные и
геометрические ограничения элементов, то есть ничто не должно ни подразумеваться, ни
предоставляться для оценки персоналу мастерской или службе контроля.
Применение общих допусков на размеры и геометрических допусков гарантирует выполнение этого
предварительного условия.
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МЕЖДУНАРОДНЫЙ СТАНДАРТ ISO 2768-2:1989
Допуски общие.
Часть 2.
Геометрические допуски для деталей без указания
допусков на отдельные размеры
1 Область распространения
Настоящая часть стандарта ISO 2768 имеет целью упрощение указаний, которые должны
фигурировать на чертежах, и предписывает общие геометрические допуски, применимые к элементам
чертежа, которые не относятся к указаниям на отдельные допуски. В стандарте общие геометрические
допуски сгруппированы в три класса.
Настоящая часть стандарта ISO 2768 распространяется, главным образом, на элементы, сделанные
путем снятия материала. Возможно его применение к элементам, полученным другими способами
производства; тем не менее, требуется дополнительный контроль, чтобы определить, является ли
обычная точность мастерской достаточной для определения пределов общих геометрических
допусков, предписанных данной частью стандарта ISO 2768.
2 Общие положения
При выборе данного класса допуска следует учитывать обычную точность мастерской. Если
необходимы меньшие значения допусков, или если для какого-нибудь отдельного элемента более
приемлемыми и экономичными являются большие значения допусков, то их следует указывать
непосредственно согласно стандарту ISO 1101 (см. А.2).
Общие геометрические допуски соответствующие данной части стандарта ISO 2768 распространяется
на чертежи или сопутствующие спецификации со ссылкой на данную часть стандарта ISO 2768
согласно Разделу 6. Они распространяются на элементы, для которых не указаны отдельные
геометрические размеры.
Общие геометрические допуски относятся ко всем геометрическим характеристикам, за исключением
допусков на цилиндричность, формы какой-либо линии или поверхности, наклона, коаксиальности
локализации и общего биения.
Во всех случаях общие геометрические допуски согласно данной части стандарта ISO 2768 следует
использовать тогда, когда используется принцип базовых допусков согласно ISO 8015, что отмечается
на чертежах (см. В.1).
3 Нормативные документы
Следующие далее стандарты содержат положения, которые распространяются на данную часть
стандарта ISO 2768. На момент публикации все указанные издания были действующими. Любой
стандарт подвергается пересмотру, а стороны, участвующие в соглашениях, основанных на данном
международном стандарте, должны следовать рекомендациям, изыскивать возможность применять
наиболее свежие издания указанных далее стандартов. Члены IEC и ISO располагают перечнем
международных стандартов, которые действуют в данное время.
ISO 1101-83 Чертежи технические. Допуски на геометрические параметры. Допуски на форму,
ориентацию, расположение и биение. Общие положения, определения, условные обозначения,
указания на чертежах.
ISO 2768-1-89 Допуски общие. Часть 1. Допуски на линейные и угловые размеры без указания
допусков на отдельные размеры.
ISO 5459-81 Чертежи технические. Допуски на геометрические параметры. Базы и системы
отсчета допусков на размеры.
ISO 8015-85 Чертежи технические. Основные принципы нанесения допусков.
1
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ISO 2768-2:1989
4 Определения
Для целей данной части ISO 2768 используются определения геометрических допусков, приведенные
в IS0 1101 и ISO 5459.
5 Общие геометрические допуски (см. также В.1)
5.1 Допуски для отдельных элементов
5.1.1 Прямоугольность и плоскостность
Общие допуски на прямоугольность и плоскостность приведены в Таблице 1. Если допуск выбирается
среди тех, которые указаны в Таблице 1, то он должен быть основан для прямоугольности на длине
соответствующей линии, а для плоскостности – на наиболее значительном боковом размере
поверхности или на диаметре в случае круговой поверхности.
Таблица 1 — Общие допуски на прямоугольность и плоскостность
Величины даны в миллиметрах
Общие допуски на прямоугольность и плоскостность для интервалов номинальных длин
Класс
допуска
до 10 от 10 от 30 от 100 от 300 от 1000
включ. до 30 до 100 до 300 до 1000 до 3000
Н 0,02 0,06 0,1 0,2 0,3 0,4
К 0,05 0,1 0,2 0,4 0,6 0,8
L 0,1 0,2 0,4 0,8 1,2 1,6
5.1.2 Круглость
Общий допуск на круглость в числовом выражении равен допуску на диаметр, однако он ни в коем
случае не должен превышать соответствующую величину допуска кругового радиального биения,
приведенную в Таблице 4 (см. пример в В.2).
5.1.3 Цилиндричность
Общие допуски на цилиндричность не указываются.
ПРИМЕЧАНИЯ
1 Отклонение от цилиндричности состоит из трех компонентов: отклонение от круглости, отклонение от
прямоугольности и отклонение от параллельности противоположных образующих. Каждый из этих компонентов
ограничен допуском, указываемым отдельно, или общим допуском.
2 Если по функциональным причинам отклонение от цилиндричности должно быть меньшим, чем
комбинированный эффект (см. В.З) общих отклонений от круглости, прямоугольности и параллельности, то для
данного элемента следует указывать отдельно допуск на цилиндричность согласно ISO 1101.
Иногда, например, в случае посадки, подходит указание требования к огибающей …
5.2 Допуски для присоединяемых элементов
5.2.1 Общие положения■
Допуски, указанные в 5.2.2 и 5.2.6, распространяются на все элементы, которые могут соединяться с
другими элементами и для которых нет особых отдельных указаний.
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ISO 2768-2:1989
5.2.2 Параллельность
Общий допуск на параллельность в числовом выражении равен допуску на размер или допуску на
плоскостность/прямоугольность, причем берется наибольшая величина. Наиболее длинный из двух
элементов должен быть взят в качестве регламентированной базы. Если два элемента имеют
одинаковую длину, то в качестве регламентированной базы может выбираться любой из этих
элементов (см. В.4).
5.2.3 Перпендикулярность
Общие допуски на перпендикулярность приведены в Таблице 2. В качестве регламентированной базы
следует выбирать наиболее длинную из двух сторон, образующих прямой угол. Если стороны имеют
одинаковую номинальную длину, то каждая из них может быть выбрана в качестве
регламентированной базы.
Таблица 2 — Общие допуски на перпендикулярность
Величины даны в миллиметрах
Общие допуски на перпендикулярность для интервалов номинальных длин наиболее
коротких сторон
Класс допуска
до 100 вклю-
свыше 100 до 300 свыше 300 до 1000 свыше 1000 до 3000
чительно
Н 0,2 0,3 0,4 0,5
К 0,4 0,6 0,8 1
L 0,6 1 1,5 2
5.2.4 Симметрия
Общие допуски на симметрию приведены в Таблице 3. В качестве регламентированной базы следует
выбирать наиболее длинный элемент. Если элементы имеют одинаковую длину, то в качестве
регламентированной базы может быть выбран каждый из них.
ПРИМЕЧАНИЕ Общие допуски на симметрию применяются:
когда по крайней мере один из двух элементов имеет медианную плоскость, или
когда оси двух элементов взаимно перпендикулярны.
См. пример в В.5
Таблица 3 — Общие допуски на симметрию
Величины даны в миллиметрах
Общие допуски на симметрию для интерва
...
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.General tolerances -- Part 2: Geometrical tolerances for features without individual tolerance indicationsTolérances générales -- Partie 2: Tolérances géométriques pour éléments non affectés de tolérances individuelles17.040.10Tolerance in ujemiLimits and fitsICS:SIST ISO 2768-2:1999enTa slovenski standard je istoveten z:ISO 2768-2:198901-marec-1999SIST ISO 2768-2:1999SLOVENSKI
STANDARD
INTERNATIONAL STANDARD IS0 2768-2 First edition 1989-l l-15 General tolerances - Part 2: Geometrical tolerances for features without individual tolerance indications Tolhances g&&ales - Partie 2: Tohances gkomhtriques pour 6lkments non affect&s de tolkances individuelles Reference number IS0 2768-2 : 1989 (E)
IS0 2768-2 : 1989 (El Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 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, govern- mental and non-governmental, in liaison with ISO, also take part in the work. IS0 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 IS0 Council. They are approved in accordance with IS0 procedures requiring at least 75 % approval by the member bodies voting. International Standard IS0 2768-2 was prepared by Technical Committee ISO/TC 3, Limits and fits. This first edition of IS0 2768-2, together with IS0 2768-l : 1989, cancel and replace IS0 2768 : 1973. IS0 2768 consists of the following parts, under the general title Genera/ tolerances: - Part tolerance for 7 : Tolerances indications linear and angular dimensions without individual - Part cations 2: Geometrical tolerances for features without individual tolerance indi- Annexes A and B of this part of IS0 2768 are for information only. 0 IS0 198s All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case postale 56 l CH-1211 Gen&ve 20 l Switzerland Printed in Switzerland ii
Iso 2768-2 : 1989 (El 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 limitations 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 tolerances this prerequisite is met. for size and geometry simplifies the task of ensuring that
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INTERNATIONAL STANDARD IS0 2768-2 : 1989 (El General tolerances - Part 2: Geometrical tolerances for features without individual tolerance indications 1 Scope This part of IS0 2768 is intended to simplify drawing indica- tions and specifies general geometrical tolerances to control those features on the drawing which have no respective in- dividual indication. It specifies general geometrical tolerances in three tolerance classes. This part of IS0 2768 mainly applies to features which are pro- duced by removal of material. Its application to features manufactured by other processes is possible; however, special examination is required to ascertain whether the customary workshop accuracy lies within the general geometrical toler- ances specified in this part of IS0 2768. 2 General When selecting the tolerance class, the respective customary workshop accuracy has to be taken into consideration, If smaller geometrical tolerances are required or larger geometrical tolerances are permissible and more economical for any individual feature, such tolerances should be indicated directly in accordance with IS0 1101 (see clause A.2). General geometrical tolerances in accordance with this part of IS0 2768 apply when drawings or associated specifications refer to this part of IS0 2768 in accordance with clause 6. They apply to features which do not have respective individual geometrical tolerance indications. General geometrical tolerances apply to all geometrical toler- ance characteristics, excluding cylindricity, profile of any line, profile of any surface, angularity, coaxiality, positional toler- ances and total run-out. In any event, general geometrical tolerances in accordance with this part of IS0 2768 should be used when the fundamental tolerancing principle in accordance with IS0 8015 is used and indicated on the drawing (see clause B. 1). 3 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of IS0 2768. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of IS0 2768 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 1101 : 1983, Technical drawings - Geometrical toleranc- ing - Tolerancing of form, orientation, location and run-out - Generalities, definitions, symbols, indications on drawings. IS0 2768-l : 1989, General tolerances - Part 7 : Tolerances for linear and angular dimensions without individual tolerance indi- cations. IS0 5459 : 1981, Technical drawings - Geometrical toleranc- ing - Datums and datum-systems for geometrical tolerances. IS0 8015 : 1985, Technical drawings - Fundamental toleranc- ing principle. 4 Definitions For the purposes of this part of IS0 2768, the definitions for geometrical tolerances given in IS0 1101 and IS0 5459 apply. 5 General geometrical tolerances (see also clause B. 1) 5.1 Tolerances for single features 5.1 .l Straightness and flatness The general tolerances on straightness and flatness are given in table 1. When a tolerance is selected from table 1, it shall be based, in the case of straightness, on the length of the cor- responding line and, in the case of flatness, on the longer lateral length of the surface, or the diameter of the circular sur- face. 1
IS0 2768-2 : 1989 (I3 Table 1 - General tolerances on straightness 5.2.3 Perpendicularity and flatness Values in millimetres Straightness and flatness tolerances for ranges of nominal lengths Toler- ance class The general tolerances on perpendicularity are given in table 2. The longer of the two sides forming the right angle shall be taken as the datum; if the sides are of equal nominal length, either may be taken as the datum. Table 2 - General tolerances on perpendicularity Values in millimetres 0,oz 1 0,05 ) 0,l 1 0,2 ) 0,3 1 0,4 0,05 ) 0,l 1 0,2 ) 0,4 1 0,6 1 Ok3 H Perpendicularity tolerances for ranges of nominal lengths of the shorter side up to loo I over 100 over 300 over 1 000 up to 300 up to 1 ooo up to 3 ooo K Toler- ance class H K L w I 02 1 0,4 ) 0,8 1 I,2 ) 1,6 L 0,2[ 0,3 ( 0,4 1 0,5 014 I 0,6 I 018 I 1 5.1.2 Circularity (46 1 115 2 The general tolerance on circularity is equal to the numerical value of the diameter tolerance, but in no case shall it be greater than the respective tolerance value for circular radial run-out given in table 4 (see examples in clause B.2). 5.2.4 Symmetry The general tolerances on symmetry are given in table 3. The longer of the two features shall be taken as the datum; if the features are of equal nominal length, either may be taken as the datum. 5.1.3 Cylindricity General tolerances on cylindricity are not specified. NOTE - The general tolerances on symmetry apply where - at least one of the two features has a median plane, or - the axes of the two features are perpendicular to each other. See examples in clause B.5. NOTES 1 The cylindricity deviation comprises three components : circularity deviation, straightness deviation and parallelism deviation of opposite generator lines. Each of these components is controlled by its in- dividually indicated or its general tolerance. Table 3 - General tolerances on symmetry Values in millimetres 2 If, for functional reasons, the cylindricity deviation has to be smaller than the combined effect (see clause B.3) of the general tolerances on circularity, straightness and parallelism, an individual cylindricity toler- ance in accordance with IS0 1101 should be indicated for the feature concerned. 1 Toler- 1 Symmetry tolerances for ranges of nominal lengths ante class to loo over 100 over 300 over 1 000 up up to 300 up to 1 ooo up to 3 ooo \ Sometimes, e.g. in the case of a fit, the indication of the envelope requirement 0 E is appropriate. I H I I W3 1 I L I W 1 I L5 I 2 5.2 Tolerances for related features 5.2.1 General 5.2.5 Coaxiality The tolerances specified in 5.2.2 to 5.2.6 apply to all features which are in relation to one another and which have no respec- tive individual indication. General tolerances on coaxiality are not specified. NOTE - The deviation in coaxiality may, in an extreme case, be as great as the tolerance value for circular radial run-out given in table 4, since the deviation in radial run-out comprises the deviation in coaxial- ity and the deviation in circularity. 5.2.2 Parallelism The general tolerance on parallelism is equal to the numerical value of the size tolerance or the flatness/straightness toler- ance, whichever is the greater. The longer of the two features shall be taken as the datum; if the features are of equal nominal length, either may be taken as the datum (see clause B.4). 5.2.6 Circular run-out The general tolerances on circular run-out (radial, axial and any surface of revolution) are given in table 4. 2
Iso 2768-2 : 1989 0 For general tolerances on circular run-out, the bearing surfaces shall be taken as the datum if they are designated as such. O
...
INTERNATIONAL IS0
2768-2
STANDARD
First edition
1989-l l-15
General tolerances -
Part 2:
Geometrical tolerances for features without individual
tolerance indications
Tolhances g&&ales -
Partie 2: Tohances gkomhtriques pour 6lkments non affect&s de tolkances
individuelles
Reference number
IS0 2768-2 : 1989 (E)
---------------------- Page: 1 ----------------------
IS0 2768-2 : 1989 (El
Foreword
IS0 (the International Organization for Standardization) is a worldwide federation of
national standards bodies (IS0 member bodies). The work of preparing International
Standards is normally carried out through IS0 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, govern-
mental and non-governmental, in liaison with ISO, also take part in the work. IS0
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 IS0 Council. They are approved in accordance with IS0 procedures requiring at
least 75 % approval by the member bodies voting.
International Standard IS0 2768-2 was prepared by Technical Committee ISO/TC 3,
Limits and fits.
This first edition of IS0 2768-2, together with IS0 2768-l : 1989, cancel and replace
IS0 2768 : 1973.
IS0 2768 consists of the following parts, under the general title Genera/ tolerances:
without
- Part 7 : Tolerances for linear and angular dimensions individual
indications
tolerance
features without individual tolerance indi-
- Part 2: Geometrical tolerances for
cations
Annexes A and B of this part of IS0 2768 are for information only.
0 IS0 198s
All rights reserved. No part of this publication may be reproduced or utilized in any form or by any
means, electronic or mechanical, including photocopying and microfilm, without permission in
writing from the publisher.
International Organization for Standardization
Case postale 56 l CH-1211 Gen&ve 20 l Switzerland
Printed in Switzerland
ii
---------------------- Page: 2 ----------------------
Iso 2768-2 : 1989 (El
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 limitations 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.
use of general tolerances for size and geometry simplifies the task of ensuring that
The
this prerequisite is met.
---------------------- Page: 3 ----------------------
This page intentionally left blank
---------------------- Page: 4 ----------------------
IS0 2768-2 : 1989 (El
INTERNATIONAL STANDARD
General tolerances -
Part 2:
Geometrical tolerances for features without individual
tolerance indications
IS0 2768. At the time of publication, the editions indicated
1 Scope
were valid. All standards are subject to revision, and parties to
agreements based on this part of IS0 2768 are encouraged to
This part of IS0 2768 is intended to simplify drawing indica-
investigate the possibility of applying the most recent editions
tions and specifies general geometrical tolerances to control
those features on the drawing which have no respective in- of the standards indicated below. Members of IEC and IS0
maintain registers of currently valid International Standards.
dividual indication. It specifies general geometrical tolerances in
three tolerance classes.
IS0 1101 : 1983, Technical drawings - Geometrical toleranc-
This part of IS0 2768 mainly applies to features which are pro-
ing - Tolerancing of form, orientation, location and run-out -
duced by removal of material. Its application to features
Generalities, definitions, symbols, indications on drawings.
manufactured by other processes is possible; however, special
examination is required to ascertain whether the customary
IS0 2768-l : 1989, General tolerances - Part 7 : Tolerances for
workshop accuracy lies within the general geometrical toler-
linear and angular dimensions without individual tolerance indi-
ances specified in this part of IS0 2768.
cations.
IS0 5459 : 1981, Technical drawings - Geometrical toleranc-
2 General
ing - Datums and datum-systems for geometrical tolerances.
When selecting the tolerance class, the respective customary
IS0 8015 : 1985, Technical drawings - Fundamental toleranc-
workshop accuracy has to be taken into consideration, If
or larger ing principle.
smaller geometrical tolerances are required
geometrical tolerances are permissible and more economical for
any individual feature, such tolerances should be indicated
directly in accordance with IS0 1101 (see clause A.2).
4 Definitions
General geometrical tolerances in accordance with this part of
IS0 2768 apply when drawings or associated specifications
For the purposes of this part of IS0 2768, the definitions for
refer to this part of IS0 2768 in accordance with clause 6. They
geometrical tolerances given in IS0 1101 and IS0 5459 apply.
apply to features which do not have respective individual
geometrical tolerance indications.
General geometrical tolerances apply to all geometrical toler-
5 General geometrical tolerances
ance characteristics, excluding cylindricity, profile of any line,
(see also clause B. 1)
profile of any surface, angularity, coaxiality, positional toler-
ances and total run-out.
5.1 Tolerances for single features
In any event, general geometrical tolerances in accordance with
this part of IS0 2768 should be used when the fundamental
5.1 .l Straightness and flatness
tolerancing principle in accordance with IS0 8015 is used and
indicated on the drawing (see clause B. 1).
The general tolerances on straightness and flatness are given in
table 1. When a tolerance is selected from table 1, it shall be
based, in the case of straightness, on the length of the cor-
3 Normative references
responding line and, in the case of flatness, on the longer
lateral length of the surface, or the diameter of the circular sur-
The following standards contain provisions which, through
face.
reference in this text, constitute provisions of this part of
1
---------------------- Page: 5 ----------------------
IS0 2768-2 : 1989 (I3
5.2.3 Perpendicularity
Table 1 - General tolerances on straightness
and flatness
The general tolerances on perpendicularity are given in table 2.
Values in millimetres
The longer of the two sides forming the right angle shall be
Straightness and flatness tolerances for ranges
taken as the datum; if the sides are of equal nominal length,
of nominal lengths
either may be taken as the datum.
Toler-
ance
class
Table 2 - General tolerances on perpendicularity
Values in millimetres
H 0,oz 1 0,05 ) 0,l 1 0,2 ) 0,3 1 0,4
Perpendicularity tolerances for ranges of
K 0,05 ) 0,l 1 0,2 ) 0,4 1 0,6 1 Ok3
Toler- nominal lengths of the shorter side
ance
L
w 02 1 0,4 ) 0,8 1 I,2 ) 1,6
I
class over 100 over 300 over 1 000
up to loo
up to 3 ooo
up to 300 up to 1 ooo
I
H 0,2[ 0,3 ( 0,4 1 0,5
K 1
014 0,6 018
I I I
5.1.2 Circularity
L 1 2
(46 115
The general tolerance on circularity is equal to the numerical
value of the diameter tolerance, but in no case shall it be greater
than the respective tolerance value for circular radial run-out
5.2.4 Symmetry
given in table 4 (see examples in clause B.2).
The general tolerances on symmetry are given in table 3. The
longer of the two features shall be taken as the datum; if the
5.1.3 Cylindricity
features are of equal nominal length, either may be taken as the
datum.
General tolerances on cylindricity are not specified.
NOTE - The general tolerances on symmetry apply where
-
NOTES
at least one of the two features has a median plane, or
-
the axes of the two features are perpendicular to each other.
1 The cylindricity deviation comprises three components : circularity
deviation, straightness deviation and parallelism deviation of opposite See examples in clause B.5.
generator lines. Each of these components is controlled by its in-
dividually indicated or its general tolerance.
Table 3 - General tolerances on symmetry
2 If, for functional reasons, the cylindricity deviation has to be smaller
Values in millimetres
than the combined effect (see clause B.3) of the general tolerances on
Symmetry tolerances for ranges of
circularity, straightness and parallelism, an individual cylindricity toler-
1 Toler- 1 nominal lengths
ance in accordance with IS0 1101 should be indicated for the feature
ante
concerned.
class
over 100 over 300 over 1 000
up to loo
up to 300 up to
1 ooo up to 3 ooo
Sometimes, e.g. in the case of a fit, the indication of the envelope
\
requirement
E is appropriate. I H I
0
I W3 1
L 2
W 1 L5
I I I I
5.2 Tolerances for related features
5.2.1 General
5.2.5 Coaxiality
The tolerances specified in 5.2.2 to 5.2.6 apply to all features
which are in relation to one another and which have no respec-
General tolerances on coaxiality are not specified.
tive individual indication.
NOTE - The deviation in coaxiality may, in an extreme case, be as
great as the tolerance value for circular radial run-out given in table 4,
since the deviation in radial run-out comprises the deviation in coaxial-
5.2.2 Parallelism
ity and the deviation in circularity.
The general tolerance on parallelism is equal to the numerical
5.2.6 Circular run-out
value of the size tolerance or the flatness/straightness toler-
ance, whichever is the greater. The longer of the two features
shall be taken as the datum; if the features are of equal nominal The general tolerances on circular run-out (radial, axial and any
length, either may be taken as the datum (see clause B.4). surface of revolution) are given in table 4.
2
---------------------- Page: 6 ----------------------
Iso 2768-2 : 1989 0
For general tolerances on circular run-out, the bearing surfaces In this case the general tolerances for angular dimensions in ac-
cordance with IS0 2768-l do not apply to right angles (900),
shall be taken as the datum if they are designated as such.
Otherwise, for circular radial run-out, the longer of the two which are implied but not indicated, because this part of
IS0 2768 specifies ge
...
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Tolérances générales -- Partie 2: Tolérances géométriques pour éléments non affectés de tolérances individuellesGeneral tolerances -- Part 2: Geometrical tolerances for features without individual tolerance indications17.040.10Tolerance in ujemiLimits and fitsICS:Ta slovenski standard je istoveten z:ISO 2768-2:1989SIST ISO 2768-2:199en01-QRYHPEHU-199SIST ISO 2768-2:199SLOVENSKI
STANDARD
SIST ISO 2768-2:1995
INTERNATIONAL STANDARD IS0 2768-2 First edition 1989-l l-15 General tolerances - Part 2: Geometrical tolerances for features without individual tolerance indications Tolhances g&&ales - Partie 2: Tohances gkomhtriques pour 6lkments non affect&s de tolkances individuelles Reference number IS0 2768-2 : 1989 (E) SIST ISO 2768-2:1995
IS0 2768-2 : 1989 (El Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 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, govern- mental and non-governmental, in liaison with ISO, also take part in the work. IS0 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 IS0 Council. They are approved in accordance with IS0 procedures requiring at least 75 % approval by the member bodies voting. International Standard IS0 2768-2 was prepared by Technical Committee ISO/TC 3, Limits and fits. This first edition of IS0 2768-2, together with IS0 2768-l : 1989, cancel and replace IS0 2768 : 1973. IS0 2768 consists of the following parts, under the general title Genera/ tolerances: - Part tolerance for 7 : Tolerances indications linear and angular dimensions without individual - Part cations 2: Geometrical tolerances for features without individual tolerance indi- Annexes A and B of this part of IS0 2768 are for information only. 0 IS0 198s All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case postale 56 l CH-1211 Gen&ve 20 l Switzerland Printed in Switzerland ii SIST ISO 2768-2:1995
Iso 2768-2 : 1989 (El 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 limitations 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 tolerances this prerequisite is met. for size and geometry simplifies the task of ensuring that SIST ISO 2768-2:1995
This page intentionally left blank SIST ISO 2768-2:1995
INTERNATIONAL STANDARD IS0 2768-2 : 1989 (El General tolerances - Part 2: Geometrical tolerances for features without individual tolerance indications 1 Scope This part of IS0 2768 is intended to simplify drawing indica- tions and specifies general geometrical tolerances to control those features on the drawing which have no respective in- dividual indication. It specifies general geometrical tolerances in three tolerance classes. This part of IS0 2768 mainly applies to features which are pro- duced by removal of material. Its application to features manufactured by other processes is possible; however, special examination is required to ascertain whether the customary workshop accuracy lies within the general geometrical toler- ances specified in this part of IS0 2768. 2 General When selecting the tolerance class, the respective customary workshop accuracy has to be taken into consideration, If smaller geometrical tolerances are required or larger geometrical tolerances are permissible and more economical for any individual feature, such tolerances should be indicated directly in accordance with IS0 1101 (see clause A.2). General geometrical tolerances in accordance with this part of IS0 2768 apply when drawings or associated specifications refer to this part of IS0 2768 in accordance with clause 6. They apply to features which do not have respective individual geometrical tolerance indications. General geometrical tolerances apply to all geometrical toler- ance characteristics, excluding cylindricity, profile of any line, profile of any surface, angularity, coaxiality, positional toler- ances and total run-out. In any event, general geometrical tolerances in accordance with this part of IS0 2768 should be used when the fundamental tolerancing principle in accordance with IS0 8015 is used and indicated on the drawing (see clause B. 1). 3 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of IS0 2768. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of IS0 2768 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 1101 : 1983, Technical drawings - Geometrical toleranc- ing - Tolerancing of form, orientation, location and run-out - Generalities, definitions, symbols, indications on drawings. IS0 2768-l : 1989, General tolerances - Part 7 : Tolerances for linear and angular dimensions without individual tolerance indi- cations. IS0 5459 : 1981, Technical drawings - Geometrical toleranc- ing - Datums and datum-systems for geometrical tolerances. IS0 8015 : 1985, Technical drawings - Fundamental toleranc- ing principle. 4 Definitions For the purposes of this part of IS0 2768, the definitions for geometrical tolerances given in IS0 1101 and IS0 5459 apply. 5 General geometrical tolerances (see also clause B. 1) 5.1 Tolerances for single features 5.1 .l Straightness and flatness The general tolerances on straightness and flatness are given in table 1. When a tolerance is selected from table 1, it shall be based, in the case of straightness, on the length of the cor- responding line and, in the case of flatness, on the longer lateral length of the surface, or the diameter of the circular sur- face. 1 SIST ISO 2768-2:1995
IS0 2768-2 : 1989 (I3 Table 1 - General tolerances on straightness 5.2.3 Perpendicularity and flatness Values in millimetres Straightness and flatness tolerances for ranges of nominal lengths Toler- ance class The general tolerances on perpendicularity are given in table 2. The longer of the two sides forming the right angle shall be taken as the datum; if the sides are of equal nominal length, either may be taken as the datum. Table 2 - General tolerances on perpendicularity Values in millimetres 0,oz 1 0,05 ) 0,l 1 0,2 ) 0,3 1 0,4 0,05 ) 0,l 1 0,2 ) 0,4 1 0,6 1 Ok3 H Perpendicularity tolerances for ranges of nominal lengths of the shorter side up to loo I over 100 over 300 over 1 000 up to 300 up to 1 ooo up to 3 ooo K Toler- ance class H K L w I 02 1 0,4 ) 0,8 1 I,2 ) 1,6 L 0,2[ 0,3 ( 0,4 1 0,5 014 I 0,6 I 018 I 1 5.1.2 Circularity (46 1 115 2 The general tolerance on circularity is equal to the numerical value of the diameter tolerance, but in no case shall it be greater than the respective tolerance value for circular radial run-out given in table 4 (see examples in clause B.2). 5.2.4 Symmetry The general tolerances on symmetry are given in table 3. The longer of the two features shall be taken as the datum; if the features are of equal nominal length, either may be taken as the datum. 5.1.3 Cylindricity General tolerances on cylindricity are not specified. NOTE - The general tolerances on symmetry apply where - at least one of the two features has a median plane, or - the axes of the two features are perpendicular to each other. See examples in clause B.5. NOTES 1 The cylindricity deviation comprises three components : circularity deviation, straightness deviation and parallelism deviation of opposite generator lines. Each of these components is controlled by its in- dividually indicated or its general tolerance. Table 3 - General tolerances on symmetry Values in millimetres 2 If, for functional reasons, the cylindricity deviation has to be smaller than the combined effect (see clause B.3) of the general tolerances on circularity, straightness and parallelism, an individual cylindricity toler- ance in accordance with IS0 1101 should be indicated for the feature concerned. 1 Toler- 1 Symmetry tolerances for ranges of nominal lengths ante class to loo over 100 over 300 over 1 000 up up to 300 up to 1 ooo up to 3 ooo \ Sometimes, e.g. in the case of a fit, the indication of the envelope requirement 0 E is appropriate. I H I I W3 1 I L I W 1 I L5 I 2 5.2 Tolerances for related features 5.2.1 General 5.2.5 Coaxiality The tolerances specified in 5.2.2 to 5.2.6 apply to all features which are in relation to one another and which have no respec- tive individual indication. General tolerances on coaxiality are not specified. NOTE - The deviation in coaxiality may, in an extreme case, be as great as the tolerance value for circular radial run-out given in table 4, since the deviation in radial run-out comprises the deviation in coaxial- ity and the deviation in circularity. 5.2.2 Parallelism The general tolerance on parallelism is equal to the numerical value of the size tolerance or the flatness/straightness toler- ance, whichever is the greater. The longer of the two features shall be taken as the datum; if the features are of equal nominal length, either may be taken as the datum (see clause B.4). 5.2.6 Circular run-out The general tolerances on circular run-out (radial, axial and any surface of revolution) are given in table 4. 2 SIST ISO 2768-2:1995
Iso 2768-2 : 1989 0 For general tolerances on circular run-out, the bearing surfaces shall be taken as the datum if they are designated
...
NORME IS0
INTERNATIONALE 2768-2
Premihe edition
1989-1 l-15
Tokrances g&hales -
Partie 2:
Tolhrances geometriques pour &ments non affect&
de tokrances individuelles
General tolerances -
Part 2: Geometrical tolerances for features without individual tolerance indications
Numho de reference
IS0 2768-2 : 1989 (F)
---------------------- Page: 1 ----------------------
IS0 2768-2 : 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
collabore 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 2768-2 a ete elaboree par le comite technique ISO/TC 3,
Ajustements.
Cette premiere edition de I ’ISO 2768-2 ainsi que I ’ISO 2768-l : 1989 annulent et rempla-
cent I ’ISO 2768 : 1973.
L ’ISO 2768 comprend les parties suivantes, presentees sous le titre general Tokrances
g&n&ales:
- Partie 7: Tokrances pour dimensions linbaires et angulaires non affect&es de
tolkrances individuelles
- Partie 2: Tolhrances gbom6triques pour 6lbments non affect& de tolbrances
individuelles
Les annexes A et 6 de la presente partie de I ’ISO 2768 sont donnees uniquement a titre
d ’information.
0 IS0 1989
Droits de reproduction reserves. Aucune partie de cette publication ne peut etre reproduite ni
utilisee sous quelque forme que ce soit et par aucun pro&de, 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
lmprime en Suisse
ii
---------------------- Page: 2 ----------------------
IS0 2768-2 : 1989 (F)
Introduction
Tous les Mments d ’un composant ont toujours une dimension et une forme geometri-
que. La fonction de IWment nkessite que les harts dimensionnels et les &arts rela-
tifs aux caracthistiques g6omktriques (forme, orientation et position) aient une limite
qui, si elle est dkpassee, nuit 3 la fonction.
Le tokrancement sur le dessin devrait etre complet afin d ’assurer que les aspects
dimensionnels et geometriques de tous les Mments sont limit&, c ’est-&dire que rien
ne doit Gtre sous-entendu ni laiss6 3 I ’apprkiation du personnel d ’atelier ou du service
de contrele.
L ’application des tolkrances ghkales dimensionnelles et g6omktriques garantit le res-
pect de cette condition prealable.
. . .
III
---------------------- Page: 3 ----------------------
NORME INTERNATIONALE IS0 2768-2 : 1989 (F)
Tobrances ghkales -
Partie 2:
ToErances geometriques pour Sments non affect&
de tolhances individuelles
1 Domaine d ’application tions valables pour la presente partie de I ’ISO 2768. Au moment
de la publication, les editions indiquees etaient en vigueur.
La presente pat-tie de I ’ISO 2768 vise a simplifier les indications
Toute norme est sujette a revision et les parties prenantes des
devant figurer sur les dessins et prescrit les tolerances geometri-
accords fond& sur la presente partie de I ’ISO 2768 sont invi-
ques g&&ales applicables aux elements du dessin qui ne font pas
tees a rechercher la possibilite d ’appliquer les editions les plus
I ’objet d ’un tolerancement individuel. Elle prescrit des tolerances
recentes des normes indiquees ci-apres. Les membres de la CEI
geometriques g&&ales regroupees en trois classes de tolerance.
et de I ’ISO possedent le registre des Normes internationales en
vigueur a un moment donne.
La presente partie de I ’ISO 2768 est applicable principalement
aux elements executes par enlevement de mat&e. Son applica-
IS0 1101 : 1983, Qessins techniques - Tolerancement
tion 8 des elements obtenus par d ’autres procedes de fabrica-
geome trique - Tolerancemen t de forme, orientation, position
tion est possible; neanmoins, cela necessite un controle sup-
et battement - G&&alit&, definitions, s ymboles, indications
plementaire pour determiner si la precision habituelle de I ’atelier
sur les dessins.
demeure dans les limites des tolerances geometriques genera-
les prescrites dans la presente partie de I ’ISO 2768.
IS0 2768-l : 1989, Tolerances genera/es - Partie 7 : Toleran-
ces pour dimensions lineaires et angulaires non affectees de
2 Gh6raIit6s
tolerances individuelles.
Le choix d ’une classe de tolerance donnee doit tenir compte de
IS0 5459 : 1981, Dessins techniques - Tolerancemen t
la precision habituelle de I ’atelier. Si des tolerances plus serrees
sont necessaires, ou si des tolerances plus larges sont admissi- geome trique - References specifiees et s ys temes de reference
specifies pour tolerances geometriques.
bles et plus economiques pour un element individuel quelcon-
que, il convient qu ’elles soient indiquees directement confor-
mement a I ’ISO 1101 (voir article A.2). IS0 8015 : 1985, Dessins techniques - Principe de tolerance-
ment de base.
Les tolerances geometriques generales conformes a la presente
partie de I ’ISO 2768 s ’appliquent aux dessins ou specifications
associees faisant reference a la presente partie de I ’ISO 2768
conformement a I ’article 6. Elles s ’appliquent aux elements ne
4 Dkfinitions
faisant pas I ’objet d ’un tolerancement geometrique individuel.
Pour les besoins de la presente partie de I ’ISO 2768, les defini-
Les tolerances geometriques g&&ales portent sur toutes les
tions pour les tolerances geometriques donnees dans I ’ISO 1101
caracteristiques geometriques tolerancees, a I ’exclusion des
et I ’ISO 5459 s ’appliquent.
tolerances de cylindricite, de forme d ’une ligne ou d ’une sur-
face quelconque, d ’inclinaison, de coaxialite, de localisation et
de battement total.
Dans tous les cas, il convient que les tolerances geometriques
5 Tokrances g6omhtriques g&&ales
g&&ales conformes a la presente partie de I ’ISO 2768 soient
(voir egalement I ’article B. 1)
utilisees lorsque le principe de tolerancement de base confor-
mement a I ’ISO 8015 est utilise et indique sur les dessins (voir
5.1 ToErances pour des Mments isol&
article B.1).
5.1.1 Rectitude et plan6it6
3 Refhrences normatives
Les normes suivantes contiennent des dispositions qui, par Les tolerances g&&ales de rectitude et de plan&e sont don-
suite de la reference qui en est faite, constituent des disposi- nees dans le tableau 1. Lorsqu ’une tolerance est choisie parmi
---------------------- Page: 4 ----------------------
Is0 2768-2 : 1989 W-1
celles du tableau 1, elle doit etre basee, pour la rectitude, sur la 5.2.3 Perpendicularit
longueur de la ligne correspondante et, pour la plan&t& sur la
plus grande dimension laterale de la surface ou sur le diametre
Les tolerances generales de perpendicularite sont donnees
dans le cas d ’une surface circulaire.
dans le tableau 2. Le plus long des deux cot& formant I ’angle
droit doit etre pris comme reference specifiee. Si les c&es ont
Tableau 1 - Tokances gQn6rales de rectitude
la meme longueur nominale, chacun d ’eux peut etre pris
et de plan&t6
comme reference specifiee.
Valeurs en millimetres
Tokrances g&&ales de rectitude et de plarGit6
pour des plages de longueurs nominales
Tableau 2 - Tolhrances ghkales de perpendicularit
Classe
Valeurs en millimetres
de to- au-deli au-deli au-de16 au-deli au-de16
lhance de 10 de 30 de 100 de 300 de 1000
Tolhrances g&hales de perpendicularit
jusqu ’A jusqu ’g jusqu ’8 jusqu ’i jusqu ’& jusqu ’g
pour des plages de longueurs nominales
10 30 100 300 1000 3000
des c6t6s les plus courts
Classe
H 0,02 0,06 0,l de
02 6,3 6,4
tokance
K 0,05 0,l 02 09 66 03
L
OJ 02 614 W3 12 I,6
H
K
5.1.2 Circularit
L
La tolerance g&&ale de circularite est egale, en valeur numeri-
que, a la tolerance sur le diametre, mais elle ne doit en aucun
cas etre superieure a la valeur correspondante de la tolerance
5.2.4 Sym&rie
de battement circulaire radial donnee dans le tableau 4 (voir
exemple a I ’article B.2).
Les tolerances generales de symetrie sont donnees dans le
tableau 3. L ’element le plus long doit etre pris comme reference
5.1.3 Cylindricith
specifiee. Si les elements ont la meme longueur nominale, cha-
cun d ’eux peut etre pris comme reference specifiee.
Des tolerances g&%-ales de cylindricite ne sont pas prescrites.
NOTE - Les tolerances generales de symetrie s ’appliquent
NOTES
-
quand au moins I ’un des deux elements a un plan median, ou
1 L ’ecart de cylindricite comprend trois composantes: &art de circu-
larite, &art de rectitude et &art de parallelisme des generatrices oppo-
-
quand les axes des deux elements sont perpendiculaires entre
sees. Chacune de ces composantes est limitee par sa tolerance indi-
eux.
quee individuellement ou par sa tolerance g&&ale.
Voir exemples a I ’article B.5.
2 Si, pour des raisons fonctionnelles, I ’ecart de cylindricite doit etre
plus petit que l ’effet combine (voir article B.3) des tolerances generales
de circularite, de rectitude et de parallelisme, il convient qu ’une tole-
rance individuelle de cylindricite conformement a I ’ISO 1101 soit indi- Tableau 3 - Tolkances ghtkales de sym6trie
quee pour I ’element concern&
Valeurs en millimetres
TolQrances gh6rales de symbtrie pour
Parfois, par exemple dans le cas d ’un ajustement, I ’indication de I ’exi-
des plages de longueurs nominales
Classe
gence de I ’enveloppe @ convient.
de
au-de16
au-deli au-deli
tokrance
de 100 de 300 de 1 000
5.2 Tolhrances pour des Mments associb
jusqu ’ti jusqu ’ti jusqu ’ti jusqu ’a
loo 300 1000 3ooo
5.2.1 G6nhalith
H
6,5
0,6 0,8 1
K
Les tolerances prescrites en 5.2.2 et 5.2.6 s ’appliquent a tous
Or6 1 I,5 2
L
les elements qui peuvent etre mis en relation avec un autre et ne
font pas I ’objet d ’indications individuelles particulieres.
5.2.2 ParaIWisme 5.2.5 Coaxialit
La tolerance generale de parallelisme est Bgale, en valeur nume-
Des tolerances generales de coaxialite ne sont pas prescrites.
rique, a la tolerance dimensionnelle ou a la tolerance de
plan&e/rectitude, en retenant la plus grande. Le plus long des
NOTE - Dans le cas extreme, I ’ecart de coaxialite peut etre aussi
deux elements doit etre pris comme reference specifiee. Si les
grand que la valeur de la tolerance de battement circulaire radial don-
deux elements ont la meme longueur nominale, I ’un ou I ’autre nee dans le tableau 4, puisque I ’ecart de battement radial est compose
de I ’ecart de coaxialite et de I&art de circularite.
peut etre pris comme reference specifiee (voir article 8.4).
2
---------------------- Page: 5 ----------------------
so 2768-2 : 1989 (F)
Dans ce cas, les tolerances generales pour les dimensions
5.2.6 Battement circulaire
angulaires conformes a I ’ISO 2768-l ne s ’appliquent pas aux
Les tolerances generales de battement circulaire (radial, axial et
angles droits (900), implicites mais non cot&, parce que la pre-
toute surface de revolution) sont don&es dans le tableau 4.
sente partie de I ’ISO 2768 p
...
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