ISO INTERNATIONAL STANDARD 6624-2 Second edition 2016-02-15 Internal combustion engines Piston rings - Part 2: Half keystone rings made of cast iron Moteurs a combustion interne - Segments de piston - Partie 2: Segments demi-trapézoidaux fabriqués en fonte moulee Reference number ISO 6624-2:2016(E) ISO International Organization for Standardization ZHEJIANG INSTOF STANDARDIZATION C15956617 @IS02016 mitted without license from IHS IS0 6624-2:2016(E) COPYRIGHTPROTECTEDDOCUMENT IS0 2016, 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. ISOcopyrightoffice Ch. de Blandonnet 8 · CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyright@iso.org www.iso.org Internationai ibr DrganizationforStandardization icensee-ZHEJIANG INSTOF STANDARDIZAoIS 06 - All rights reserved Not for Resale, 2016/4/26 02:26:45 networking permited withoutlicense from IHS IS0 6624-2:2016(E) Contents Page Foreword .iv Introduction .V 1 Scope. .1 2 Normative references ..1 3 Overview .1 4 Ring types and designation examples 4.1 Type HK - Straight faced half keystone ring 7 .1 4.1.1 General features. 1 4.1.2 Designation.. .2 4.2 Type HKB - Barrel faced half keystone ring 7o .2 4.2.1 General features 2 4.2.2 Designation .4 4.3 Type HKBA - Asymmetrical barrel faced half keystone ring 7°(h1 ≥ 1,2 mm) .4 4.3.1 General features. ..4 4.3.2 Designation 5 Common features ..5 5.1 Type HK, HKB and HKBA - Half keystone ring. .5 5.1.1 Uncoated rings .5 5.1.2 Chromium plated or spray coated rings. .6 5.2 Chamfered edges - Type HK, HKB and HKBA rings Outside and/or inside chamfered edges (KA, KI) 7 5.3 Type HK, HKB and HKBA rings (fully faced, semi-inlaid) - Plating/coating thicknes.. 6 Force factors ..8 7 Dimensions and forces .8 Annex A (normative) Calculation of measurement width h3 of half keystone rings ..17 Bibliography ..18 ii thout license from IHS