ISO INTERNATIONAL STANDARD 10208 First edition 1991-02-15 Rock drilling equipment - Left-hand rope threads Materiel de forage des roches -- Filetage corde a gauche Referencenumber JSO10208:1991(E) Copyright I ISO10208:1991(E) Foreword Iso(theInternationalOrganizationforStandardization)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 the right to be represented on that committee. International organizations, govern- mental and non-governmental, in liaison with Iso, also take part in the work.Iso collaborates closely with the International Electrotechnical Commission(lEC)onallmattersofelectrotechnicalstandardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an Inter- national Standard requires approval by at least 75% of the member bodies casting a vote. International Standard Iso 10208 was prepared by Technical Committee ISO/TC 82, Mining. This present International Standard, together with Iso 10207:1991, can- cels and replaces IsO 1719:1974 and ISO 1720:1974, of which it consti- tutes a technical revision. ISO1991 All rights reserved. No part of this publication may be reproduced or utiized in any form or by any means,electronic or mechanical, including photocopying and microfilm,without permission In writing from the publisher. International OrganizatlonforStandardization Case Postale 56· CH-1211 Geneve 20· Switzerland Printed in Switzerland Copyright intermational Organization for Standardization ISO 10208:1991(E) INTERNATIONAL STANDARD Rock drilling equipment -- Left-hand rope threads 1 Scope 2 Dimensions This International Standard specifies the dimensions The dimensions of left-hand rope threads shall and tolerances of left-hand rope threads to be used comply with those shown in figure1 and given in ta- on rope threaded drill steel equipment for ble1.Figure2 shows supplementary details onthe percussive drilling. joint-tangent of R, and Rz (pitch = 12,7 mm). Copyright International Organizatin for Standardization 1