ISO INTERNATIONAL STANDARD 355 Third edition 2019-05 Rolling bearings Tapered roller bearings Boundary dimensions and series designations Roulements Roulements a rouleaux coniques - Dimensions d'encombrement et désignation des séries Reference number IS0 355:2019(E) [so @IS02019 IS0 355:2019(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2019 All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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 CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Fax: +41 22 749 09 47 Email: [email protected] Website: www.iso.org Published in Switzerland i @ IS0 2019 - All rights reserved IS0 355:2019(E) Contents Page Foreword ..iv 1 Scope 2 Normative references 3 Terms and definitions 4 Symbols. 5 Series designations ..4 6 Boundary dimensions .5 6.1 General .5 6.2 Single-row tapered roller bearings ..5 6.3 Double-row or matched pair of tapered roller bearings 22 6.4 Single-row tapered roller bearings with flanged outer rings 30 Annex A (informative) Flange dimensions for additional outer ring sizes. .39 Bibliography ..41 @ IS0 2019 - All rights reserved ii