ISO INTERNATIONAL STANDARD 1660 Third edition 2017-02 Geometrical product specifications (GPS) Geometrical tolerancing Profile tolerancing Spécification géométrique des produits (GPS) Tolérancement géométrique - Tolérancement des profils Reference number ISO 1660:2017(E) so International Organization for Standardization @ IS0 2017 see=ZHEJIANG INST OF STANDARDIZATION C1 5956617 vided by IHS under I Not for Resale, 2017/5/11 02:09:05 No reproduction or networking permitted without license from IHS IS0 1660:2017(E) COPYRIGHT PROTECTED DOCUMENT IS0 2017, Published in Switzerland 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 +41 22 749 09 47 [email protected] www.iso.org Licensee-ZHEJIANG INST OF STANDARDIzoISQ 07 - All rights reserved networking permited without license from IHS IS0 1660:2017(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references ..1 3 Terms and definitions ..1 4 Symbols. ..2 5 Rules for profile tolerancing .3 5.1 General. .3 5.2 Default rules for profile tolerancing .4 5.2.1 Rule A: Definition of the theoretically exact feature (TEF) 4 5.2.2 Rule B: Type of toleranced feature. .5 5.2.3 Rule C: Definition of the tolerance zone . .5 5.3 Rules for profile tolerancing using additional specification elements 7 5.3.1 Rule D: Toleranced feature specification elements. 7 5.3.2 Rule E: Unequally disposed tolerance zone .8 5.3.3 Rule F: Linear tolerance zone offset ..8 5.3.4 Rule G: Angular tolerance zone offset. .8 5.3.5 Rule H: Variable tolerance zone width. .8 5.3.6 Rule I: Filtered feature specification elements .8 5.3.7 Rule J: Association and parameter specification elements ..9 5.3.8 Rule K: Associated toleranced feature specification elements .9 5.3.9 Rule L: Non-rigid part. .9 Annex A (informative) Compound features ..10 Annex B (informative) Illustration of the rules ..12 Annex C (informative) Former practices .42 Annex D (informative) Relation to the GPS matrix model ..44 Bibliography ..45 ii icensee=ZHEJIANG INST OF STANDARDIZATION C1 5956617 vithout license from IHS