ISO INTERNATIONAL STANDARD 3438 Third edition 2013-05-01 Subland twist drills for holes prior to tapping screw threads Forets étagés pour avant-trous de taraudage Reference number ISO 3438:2013(E) LSO IS02013 itted without license from IHS Not for Resale IS0 3438:2013(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2013 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 +4122 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ IS0 2013 - All rights reserved No reproductic r neworking permited without license from IHS Not for Resale IS0 3438:2013(E) Contents Page Foreword ..iv 1 Scope .1 2 Normativereferences 3 Dimensions. 3.1 General 1 3.2 Subland twist drills with Morse taper shank 1 3.3 Subland twist drill with cylindrical shank Annex A (informative) Relationship between the symbols of this International Standard and the Is013399series Bibliography 5 iii d by IHS under lic ense with ISt ed without license from IHS Not for Resale