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

Oct 28, 2026

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ISO 2768-1 specifies general tolerances for linear and angular dimensions on technical drawings when individual tolerance indications are not provided. It defines how to simplify drawing indications using four tolerance classes, instructing that customary workshop accuracy should guide class selection. It also explains when general tolerances apply to size and geometry, how references to other International Standards affect tolerance selection, and what types of dimensions are excluded. Normative references and scope conditions are provided for practical use in machining and related contexts.

LanguageEnglish

CategoryResearch & Report

FormatPDF

Pages7

Reading Time18 min

AccessFree to download

Introduction

General tolerances

1 Scope

3 Normative references

4 General tolerances

4.1 Linear dimensions

4.2 Angular dimensions

INTERNATIONALSTANDARD General tolerances一 Part 1: Tolerances for linear and angular dimensions withoutindividual tolerance indications Tolérances générales - Partie 1:Tolérances pour dimensions lineaires et angulaires non affectées detolérances individuelles Foreword ISO (the International Organization for Standardization)is a worldwide federation ofnational standards bodies(ISO member bodies).The work of preparing InternationalStandards is normally carried out through ISO technical committees.Each memberbody interested in a subject for which a technical committee has been established hasthe right to be represented on that committee.nternational organizations,govern-mental and non-governmental,in liaison with ISO,also take part in the work.ISOcollaborates closely with the International Electrotechnical Commission(IEC)on allmatters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated tothe member bodies for approval before their acceptance as International Standards bythe ISO Council.They are approved in accordance with ISO procedures requiring atleast 75%approval by the member bodies voting. International Standard ISO 2768-1 was prepared by Technical Committee ISO/TC 3,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 tolerances: 一Part 1:Tolerances for linear and angular dimensions without individualtolerance indications 一Part 2:Geometrical tolerances for features without individual tolerance indi-cations Annex A of this part of ISO 2768 is for information only. ◎ ISO 1989 All rights reserved.No part of this publication may be reproduced or utilized in any form or by anymeans,electronic or mechanical,including photocopying and microfilm,without permission inwriting from the publisher. International Organization for Standardization Case postale 56·CH-1211 Genève 20·SwitzerlandPrinted in Switzerland # Introduction All features on component parts always have a size and a geometrical shape.Forthe deviation of size and for the deviations of the geometrical characteristics(form,orientation and location)the function of the part requires limitations which,whenexceeded,impair this function. The tolerancing on the drawing should be complete to ensure that the elements of sizeand 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 for size and geometry simplifies the task of ensuring thatthis prerequisite is met. # General tolerances一 Part 1: Tolerances for linear and angular dimensions without individualtolerance indications 2 General ## 1 Scope This part of ISO 2768 is intended to simplify drawing indica-tions and it specifies general tolerances for linear and angulardimensions without individual tolerance indications in four tol-erance classes. When selecting the tolerance class,the respective customaryworkshop accuracy has to be taken into consideration.If smal-ler tolerances are required or larger tolerances are permissibleand more economical for any individual feature,such toleran-ces should be indicated adjacent to the relevant nominal dimen-sion(s). NOTE 1-The concepts behind the general tolerancing of linear andangular dimensions are described in annex A. General tolerances for linear and angular dimensions applywhen drawings or associated specifications refer to this part ofISO 2768 in accordance with clauses 4 and 5.If there are gen-eral tolerances for other processes,as specified in other Inter-national Standards,reference shall be made to them on thedrawings or associated specifications.For a dimensionbetween an unfinished and a finished surface,e.g.of cast orforged parts,for which no individual tolerance is directly indi-cated,the larger of the two g

FAQs

What is ISO 2768-1 intended to simplify?

It simplifies drawing indications by specifying general tolerances for linear and angular dimensions without individual tolerance indications.

How should the tolerance class be selected?

Select the tolerance class based on the customary workshop accuracy; use smaller tolerances or larger, more economical tolerances only when appropriate for individual features.

Which dimensions does this part apply to?

It applies to the specified linear and angular dimensions that do not have an individual tolerance indication, and includes cases such as external/internal sizes, diameters, radii, distances, and typical angular features like right angles unless ISO 2768-2 is referenced.

Oct 28, 2026

Upload by Bulrr