ISO INTERNATIONAL STANDARD 16239 First edition 2013-11-01 Metric series wires for measuring screw threads Piges meétriques pour mesurage des filetages Reference number ISO 16239:2013(E) ISO @IS02013 Not for Resale IS0 16239:2013(E) COPYRIGHT PROTECTED DOCUMENT @IS02013 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form written permission. Permission can be requested 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 copyright@iso.org Web www.iso.org Published in Switzerland @ IS0 2013 - All rights reserved y IHS und No reproduction or networking permited without license from IHS Not for Resale IS0 16239:2013(E) Contents Page Foreword ..iv 1 Scope .1 2 Normative references 3 Terms and definitions 4 Reference temperature 5 Material, hardness, and surface finish ..1 6 Nominal diameters of best-size wires. .2 6.1 Wires for Iso general purpose metric screw threads (M) .2 6.2 Wires for Unified screw threads (UN) .2 6.3 Wires for Whitworth pipe threads (G, R) .2 6.4 Wires for IsO metric trapezoidal screw threads (Tr) ..2 7 Tolerances of wires ..4 8 Measurement methods for wires. ..4 8.1 Measuring the actual diameters of each wire .4 8.2 Determination of the difference of the actual diameters around a wire ..4 9 Designation 6 Copyritnteatinal Organzasnt? Sadizah rights reserved iii se with ISt vithout license from IHS Not for Resale