ISO INTERNATIONAL STANDARD 228-1 Fourth edition 2000-09-01 Pipe threads where pressure-tight joints are not made on the threads - Part 1: Dimensions, tolerances and designation Filetages de tuyauterie pour raccordement sans étancheite dans le filet - Partie 1: Dimensions, tolérances et désignation Reference number E ISO 228-1:2000(E) ISO @ ISO 2000 py IHS under ted without license from IHS Not for Resale ISO 228-1:2000(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The IsO Central Secretariat accepts no liability in this area. Adobe is a trademarkof Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event ?ISO2000 All rights reserved. Unless otherwise specified, 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 either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Case postale 56.CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.ch Printed in Switzerland @ IsO 2000 - All rights reserved ermittedwithoutlicense from IHS Not for Resale ISO 228-1:2000(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 iSsO 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, governmental 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. International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 3. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote International Standard ISO 228-1 was prepared by Technical Committee ISO/TC 5, Ferrous metal pipes and This fourth edition cancels and replaces the third edition (isO 228-1:1994), which has been technically revised. made on the threads: Part 1: Dimensions, tolerances and designation Part 2: Verification by means of limit gauges Annex A of this part of ISO 228 is for information only. ii Not for Resale INTERNATIONAL STANDARD ISO 228-1:2000(E) Pipe threads where pressure-tight joints are not made on the threads : Part 1: Dimensions, tolerances and designation Scope fastening pipe threads, thread sizes 1/16 to 6 inclusive. Both internal and external threads are parallel threads intended for the mechanical assembly of the component parts of fittings, cocks and valves, accessories, etc. These threads are not suitable as jointing threads where a pressure-tight joint is made on the thread. If assemblies. with such threads must be made pressure-tight, this should be effected by compressing two tightening surfaces outside the threads, and by interposing an appropriate seal. NOTE 1 For pipe threads where pressure-tight joints are made on the threads, see Iso 7-1. NOTE 2 IsO 228-2 gives details of methods for verification of fastening thread dimensions and form, and recommended gauging systems. 2Normative reference The followin