ISO INTERNATIONAL STANDARD 16047 First edition 2005-02-01 Fasteners Torque/clamp force testing Eléments de fixation —Essais couple/tension Reference number ISO 16047:2005(E) @ ISO 2005 ISO 16047:2005(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 trademark of 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 ? ISO2005 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.org Published in Switzerland @ ISO 2005 - All rights reserved ISO 16047:2005(E) Contents Page Foreword. 1 Scope. 2 Normativereferences 3 Terms and definitions 4 Symbols and their designations.. 3 5 Principle of test 5.1 General.... 5.2 Determination of coefficients of friction 5.3 Determination of torque coefficient K (K-factor). 5.4 Determination of ratio T/F.... 6 6.1 Testing machine 6.2 Test fixture... 7 Test parts 7.1 7.2 Test-bearing plates or test washers. 7.3 Test nuts for testing bolts, screws and studs.... 8 7.4 Test bolts or test screws for testing nuts.. 8 Testing under standard conditions.. 9 9 Testing under specific conditions. 10 Evaluation of results.. 10.1 Determination of torque coefficient K..... 9 10.2 Determination of coefficient of total friction ftot 10 10.3 Determination of coefficient of friction between threads flth .... 10 10.4 Determination of coefficient of friction between bearing surfaces fb 10.5 Determination of yield clamp force Fy 10.6 Determination of yield tightening torque Ty 11 10.7 Determination of ultimate clamp force Fu : 11 10.8 Determination of ultimate tightening torque Ty : 11 11 Test report.... 11.1 General 11 11.2 Description of fasteners to be tested. 12 11.3 Description of test parts... 13 11.4 Testing machine.... 13 11.5 Test fixture. 14 11.6 Environmental conditions.. 11.7 Specific conditions 11.8 Test results Bibliography alion'ghts reserved ii ISO 16047:2005(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 technicalcommittees.Eachmemberbodyinterestedinasubjectforwhichatechnical committeehasbeen 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 2. The main task of technical committees is to prepare International Standards. 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. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. IsO shall not be held responsible for identifying any or all such patent rights. ISO 16047 was prepared by Technical Committee ISO/TC 2, Fasteners, Subcommittee SC 1, Mechanical properties offasteners. @ ISo 2005 - All rights reserved INTERNATIONAL STANDARD ISO 16047:2005(E) Fasteners Torque/clamp force test