BS ISO 6624-4:2016 BSl Standards Publication Internal combustion engines - Piston rings Part 4: Half keystone rings made of steel bsi. ..making excellence a habit. BS ISO 6624-4:2016 BRITISH STANDARD National foreword This British Standard is the UK implementation of IS0 6624-4:2016. It supersedes BS ISO 6624-4:2003 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee MCE/14/-/10, RICengines - Cylinders, pistons and rings. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. @ The British Standards Institution 2016. Published by BSI Standards Limited 2016 ISBN 978 0580746574 ICS 43.060.10 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 March 2016. Amendments/corrigenda issued since publication Date Textaffected BS ISO 6624-4:2016 INTERNATIONAL ISO STANDARD 6624-4 Second edition 2016-02-15 Internal combustion engines - Piston rings Part 4: Half keystone rings made of steel Moteurs a combustion interne - Segments de piston - Partie 4: Segments semi-trapezoidaux en acier Reference number IS0 6624-4:2016(E) ISO @IS02016