ISO INTERNATIONAL STANDARD 7-2 Second edition 2000-09-15 Pipe threads where pressure-tight joints are made on the threads - Part 2: Verification by means of limit gauges Filetages de tuyauterie pour raccordement avec étancheite dans le filet- Partie 2: Vérification par calibres a limites Reference number ISO 7-2:2000(E) ISO @ ISO 2000 ISO 7-2:2000(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 area. Adobeis atrademarkof AdobeSystemsIncorporated 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 C 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 ii @ IsO 2000 - All rights reserved ISO 7-2:2000(E) Contents Page Foreword Introduction Scope 2 Normative reference. 3 Terms and definitions 4 Symbols. 5 Design of gauges 5.1 General... 5.2 Taper full form threaded plug gauges (gauges No. 1 and No. 2). 5.3 Parallel full form threaded ring gauge (gauge No. 3) .... 5.4 Taper plain ring gauge (gauge No. 4) ... 10 5.5 Taper modified thread form check piug gauge (gauge No. 5) 1 5.6 Parallel modified thread form check ring gauge (gauge No. 6) .. 13 6 Use of gauges and checking of pipe threads .. 14 6.1 General..... 14 6.2 Checking of internal taper (Rc) and internal parallel (Rp) threads. 15 6.3 Checking of external taper (R) threads ...... 16 7 Gauge dimensions and manufacturing tolerances, checking of new gauges and checking when printed) gaugesforwear.......... 17 7.1 Gauge dimensions and manufacturing tolerances.. .17 7.2 Checking of new gauges... 23 7.3 Checking gauges for wear. 26 7.4 Marking of gauges .... 28 Annex A (normative) Summary of gauges 29 Iso2000-All rights reserved ili ISO 7-2:2000(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (isO memberbodies).TheworkofpreparingInternationalStandardsisnormallycarriedoutthroughISOtechnica committees. Each member body interested in a subject for which a technical committee has been established has liaison with IsO, also take part in the work. IsO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. InternationalStandardsaredraftedinaccordancewiththerulesgivenintheiSO/lECDirectives,Part3 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 fittings, Subcommittee Sc 5, Threaded or plain end butt-welding fittings, gauging of threads. This second edition cancels and replaces the first edition (isO 7-2:1982), which has been technically revised. IsO 7 consists of the following parts, under the general title Pipe threads where pressure-tight joints are made on thethreads: dwhenprinted Part 1:Dimensions, tolerances and designation Part 2: Verification by means of limit gauges teed Annex A forms a normative part of this part of IsO 7. Accessed by UNSW - LIBRARY on 05 Dec 2017 (Document currency not guarant iv @ ISO 2000 - All rights reserved ISO 7-2:2000(E) Introd