ISO INTERNATIONAL STANDARD 2768-1 First edition 1989-11-15 General tolerances Part 1: Tolerances for linear and angular dimensions without individual toleranceindications Tolerances generales- Partie 1 : Tolerances pour dimensions lineaires et angulaires non affectees de tolerances individuellies Reference number ISO 2768-1 : 1989 (E) ISO 2768-1 : 1989 (E) Foreword ISo (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISo member bodies). The work of preparing International Standards is normally carried out through Iso technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, 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 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 : Part 1: Tolerances for linear and angular dimensions without individual tolerance indications Part 2: Geometrical tolerances for features without individual tolerance indi- cations Annex A of this part of Iso 2768 is for information only. ISO1989 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.CH-1211 Geneve 20.Switzerland Printed in Switzerland ii ISO 2768-1 : 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 limitations which, when exceeded, impair this function. The tolerancing on the drawing shouid be complete to ensure that the elements of size ment in the workshop or in the inspection department. The use of general tolerances for size and geometry simplifies the task of ensuring that this prerequisite is met.