ISO INTERNATIONAL STANDARD 2157 Fourth edition 2016-05-01 Dentistry Nominal diameters and designation code numbers for rotary instruments Medecine bucco-dentaire - Diametres nominaux et designation par numero de code pour instruments rotatifs dentaires Reference number ISO 2157:2016(E) ISO International Organization for Standardization @ IS0 2016 =ZHEJIANG INST OF STANDARDIZATION C1 5956617 vided by IHS under lic itted without license from IHS IS0 2157:2016(E) COPYRIGHTPROTECTEDDOCUMENT IS02016,PublishedinSwitzerland 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 ensee-ZHEJIANG INST OF STANDARDIZRoISQ ,6 - All rights reserved etworking permitted without license from IHS IS0 2157:2016(E) Contents Page Foreword ..iv Introduction. 1 Scope.. 2 Normative references 3 Terms and definitions 4 Nominal diameters and designation ..2 Inteatinal oganzation @st(Sr201.6 - All rights reserved iii see=ZHEJIANG INST OF STANDARDIZATION C15956617 vided by IHS under lic ed without license from IHS Not for Resale, 2016/7/20 08:14:46