EN 22768-1:1993

General tolerances - Part 1: Tolerances for linear and angular dimensions without individual tolerance indications (ISO 2768-1:1989)

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.

Allgemeintoleranzen - Teil 1: Toleranzen für Längen- und Winkelmaße ohne einzelne Toleranzeintragung (ISO 2768-1:1989)

Tolérances générales - Partie 1: Tolérances pour dimensions linéaires et angulaires non affectées de tolérances individuelles (ISO 2768-1:1989)

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.

General tolerances - Part 1: Tolerances for linear and angular dimensions without individual tolerance indications (ISO 2768-1:1989)

General Information

• Status: Published
• Publication Date: 21-Apr-1993
• Withdrawal Date: 29-Oct-1993
• ICS: 17.040.10 - Limits and fits
• Technical Committee: CEN/SS I03 - Limits & Fits
• Drafting Committee: CEN/SS I03 - Limits & Fits
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Start Date: 13-Oct-1999
• Completion Date: 13-Oct-1999
• Ref Project: SIST EN 22768-1:2000 - General tolerances - Part 1: Tolerances for linear and angular dimensions without individual tolerance indications (ISO 2768-1:1989)

Relations

• Revised: prEN ISO 2768 - Geometrical product specifications (GPS) - Dimensional tolerancing -Tolerance limits for general specification of linear and angular sizes (ISO/DIS 2768:2025)
• Effective Date: 19-Jan-2023

Overview

EN 22768-1:1993 (identical with ISO 2768-1:1989) defines general tolerances for linear and angular dimensions that have no individual tolerance indications on drawings. Its purpose is to simplify drawing indications and to provide default tolerance rules for parts produced by metal removal or formed from sheet metal. The part contains three tables of permissible deviations, an informative annex explaining the concepts behind general tolerancing, and guidance on how to declare the tolerancing on drawings.

Key topics and requirements

• Scope: Applies to linear dimensions (external/internal sizes, diameters, radii, distances, chamfers) and angular dimensions where no specific tolerance is shown. It excludes auxiliary dimensions in brackets and theoretically exact dimensions.
• Tolerance classes: Defines four general tolerance classes - fine, medium, coarse, and very coarse - aligned to customary workshop accuracy. Designers select the class appropriate to function and manufacturing capability.
• Reference on drawings: To apply the standard, drawings must state the reference (e.g., “ISO 2768-1”) and the chosen tolerance class in or near the title block.
• Tables and annex: Contains three normative tables (linear dimensions, broken edges such as external radii and chamfers, and angular deviations) and an informative Annex A describing the rationale and practical use of general tolerances.
• Non-rejection rule: Exceeding a general tolerance does not automatically require rejection if the part’s function is not impaired - inspection decisions should consider functional fit.
• Interaction with other standards: If other general tolerance standards apply (e.g., for castings), those must be referenced instead.

Practical applications

• Use EN 22768-1:1993 for production drawings where many dimensions do not require tight individual tolerances, such as:
  • Machined components produced by metal removal
  • Sheet-metal parts and assemblies
  • General mechanical parts where standard workshop accuracy suffices
• Benefits include clearer drawings, reduced dimension-by-dimension tolerancing work, easier supplier negotiations, and lower inspection burden for non-critical features.

Who should use this standard

• Design engineers and draughtsmen preparing production drawings
• Manufacturing engineers and shop floor supervisors determining process capability
• Quality and inspection teams for sampling and acceptance decisions
• Purchasing and subcontracting specialists negotiating production orders

Related standards

• ISO 2768-2: Geometrical tolerances for features without individual indications
• ISO 8015: Fundamental tolerancing principle
• ISO 8062: Dimensional tolerances for castings (parallel guidance where applicable)

Keywords: EN 22768-1:1993, ISO 2768-1:1989, general tolerances, linear and angular dimensions, tolerance classes, drawing indications, sheet metal, machined parts.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.General tolerances - Part 1: Tolerances for linear and angular dimensions without individual tolerance indications (ISO 2768-1:1989)Allgemeintoleranzen - Teil 1: Toleranzen für Längen- und Winkelmaße ohne einzelne Toleranzeintragung (ISO 2768-1:1989)Tolérances générales - Partie 1: Tolérances pour dimensions linéaires et angulaires non affectées de tolérances individuelles (ISO 2768-1:1989)General tolerances - Part 1: Tolerances for linear and angular dimensions without individual tolerance indications (ISO 2768-1:1989)17.040.10Tolerance in ujemiLimits and fitsICS:Ta slovenski standard je istoveten z:EN 22768-1:1993SIST EN 22768-1:2000en01-december-2000SIST EN 22768-1:2000SLOVENSKI
STANDARD
INTERNATIONAL STANDARD ISO 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) SIST EN 22768-1:2000

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. International Standard Limits and fits. ISO 2768- 1 was prepared bY Technical Committee ISO/TC 3, 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 tolerante indica tions - Part ca tions 2: Geome trical tolerantes for fea tures without individual tolerante indi- for linear and angular dimensions withou t individual 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 SIST EN 22768-1:2000

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 this prerequisite is met. for size and geometry simplifies the task of ensuring that SIST EN 22768-1:2000

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