ISO INTERNATIONAL STANDARD 1478 Second edition 1999-08-01 Tapping screws thread Filetage de vis a tole TSO Reference number ISO 1478:1999(E) by IHS under lic Not for Resale ISO 1478:1999(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 Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 3. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. InternationalStandardISO1478waspreparedbyTechnicalCommitteeISO/TC2,Fasteners. @ISO1999 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic ormechanical,includingphotocopyingandmicrotilm,withoutpermissioninwritingfromthepublisher nternationalOrganizationforStandardization Casepostale56·CH-1211Geneve20·Switzerland Internet iso@iso.ch Printed in Switzerland ational Organization for Standardizatior Not for Resale ISO 1478:1999(E) INTERNATIONALSTANDARD @ISO Tapping screws thread 1 Scope This International Standard specifies the thread and thread ends for tapping screws (sheet metal screws) with thread sizes from ST1,5 to ST9,5 inclusive. 2 Dimensions See Figures 1 and 2 and Table 1. Thread (ST) Thread profile P 60° a Slight radius Figure 1 Thread dimensions y IHS under nitted without license from IHS Not for Resale