ISO INTERNATIONAL STANDARD 494 Third edition 2017-02 Cylindrical shank twist drills Long series Forets a queue cylindrique - Série longue Reference number IS0494:2017(E) International Organization for Standardization @ IS0 2017 e=ZHEJIANG INST OF STANDARDIZATION C1 5956617 vided by IHS under lic Not for Resale, 2017/5/11 02:39:41 itted without license from IHS IS0 494:2017(E) COPYRIGHTPROTECTEDDOCUMENT IS0 2017, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior 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 Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +4122 749 09 47 [email protected] www.iso.org Intenationai br PrganizationforStandardization icensee-ZHEJIANG INST OF STANDARDIZRoISQ s1.7 - All rights reserved etworking permitted without license from IHS IS0 494:2017(E) Contents Page Foreword ..iv 1 Scope 1 2 Normative references ..1 3 Terms and definitions ..1 4 Dimensions 4.1 General .1 4.2 General dimensions 4.3 Lengths set out as functions of diameter steps ..3 5 Cutting length ..4 6 Shank ..4 Annex A (informative) Relationship between designations in this document and the IS0 13399 series. .5 Bibliography 6 iii e=ZHEJIANG INSTOFSTANDARDIZATION C15956617 vided by IHS underI se with ISi withoutlicense from IHS