ISO INTERNATIONAL STANDARD 3290-2 Secondedition 2014-09-01 Rolling bearings - Balls Part 2: Ceramic balls Roulements-Billes - Partie 2: Billes de roulement en ceramique Reference number IS0 3290-2:2014(E) LSO IS02014 by IHS under lic itted without license from IHS Not for Resale IS0 3290-2:2014(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2014 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 Case postale 56:CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyright@iso.org Web www.iso.org Published in Switzerland @ IS0 2014 - All rights reserved No reproductic networking permited without license from IHS Not for Resale IS0 3290-2:2014(E) Contents Page Foreword ..iv 1 Scope 2 Normative references .1 3 Terms and definitions ..1 4 Symbols ..4 5 Requirements ..4 5.1 Ball size .4 5.2 Qualityofgeometryand surface ..4 5.3 Sorting accuracy and ball gauges ..5 6 Material .5 7 Dimensions and tolerances .5 7.1 .5 General 7.2 Shortened formats for nominal diameter identification ..5 Annex A (normative) Method for assessment of deviation from spherical form ..11 Annex B (normative) Illustration of ball gauges and sorting principles .12 Annex C (informative) Examples of defect types and methods of inspection .14 Bibliography .15 iii se with ISt lout license from IHS Not for Resale