ISO INTERNATIONAL STANDARD 19690-2 First edition 2018-09-30 Disc springs - Part 2: Technical specifications Ressorts a disques - Partie 2: Spécifications techniques Reference number IS0 19690-2:2018(E) ISO @IS02018 IS0 19690-2:2018(E) COPYRIGHT PROTECTED DOCUMENT IS0 2018, Published in Switzerland All rights reserve Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form writtenpermission.Permission canberequestedfromeitherIsOattheaddressbelow orIso'smemberbodyinthecountryof the requester. ISO copyright office Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 [email protected] www.iso.org ii @ IS0 2018 - All rights reserved IS0 19690-2:2018 Contents Page Foreword ..iv 1 Scope .1 2 Normative references ..1 3 Terms and definitions 4 Symbols and units ..2 5 Dimensions and designation .3 5.1 General. .3 5.2 Disc spring groups .5 5.3 Dimensional series. ..5 6 Grade A Basic performance requirements for static applications .5 6.1 Material .5 6.2 Manufacturing process. .5 6.3 Permissiblestresses .6 6.4 Presetting 6 6.5 Surface condition and corrosion protection. .6 6.6 Tolerances .6 6.6.1 Thickness. .6 6.6.2 External- internal diameter and coaxiality 7 6.6.3 Free height. 6.6.4 Spring loa ..8 6.7 Clearance between disc spring and guiding element .8 6.8 Hardness. ..9 6.9 Appearance .9 7 Grade B - Requirements on disc springs for dynamic applications and high- performance static applications .9 7.1 Material .9 7.2 Manufacturing process. ..9 7.3 Permissible stresses. .10 7.3.1 Static loa .10 7.3.2 Dynamic loading .11 7.4 Shot peening 13 7.5 Presetting. 13 7.6 Creep and relaxation .13 7.7 Surface condition and corrosion protection .15 7.8 Tolerances 16 7.8.1 Thickness. 16 7.8.2 External-internal diameter and coaxiality 16 7.8.3 Free height. ..17 7.8.4 Spring loa .17 7.9 Clearance between disc spring and guiding element .17 7.10 Hardness... ..18 7.11 Appearance 18 Annex A (informative) Spring dimensions ..19 Annex B (informative) Testing ..24 Annex C (normative) Representative material grades ..27 Bibliography .28 @ IS0 2018 - All rights reserved ii