BS ISO 6621-4:2015 BSIStandardsPublication Internal combustion engines - Piston rings Part 4: General specifications bsi. ..making excellence a habit. British Stand ards Institution / and Standardization 5990390 BSISO6621-4:2015 BRITISHSTANDARD National foreword ThisBritish Standard istheUK implementation of IS06621-4:2015. It supersedes BS IS0 6621-4:2003 which is withdrawn. The UK participation in its preparation was entrusted toTechnical Committee MCE/14/-/10, RIC engines - Cylinders, pistons and rings. A listof organizations represented on thiscommittee can be obtained on requestto its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. @TheBritishStandardsInstitution2015. Published by BSI Standards Limited 2015 ISBN9780580745225 ICS 43.060.10 CompliancewithaBritishStandardcannotconferimmunityfrom legal obligations. This BritishStandard was published undertheauthorityof the StandardsPolicyandStrategyCommitteeon31March2015. Amendments/corrigenda issued since publication Date Textaffected British Standards Insttution of quality and Standardization 5990390 with BSI - Uncontrolled C BS ISO 6621-4:2015 INTERNATIONAL ISO STANDARD 6621-4 Third edition 2015-03-15 Internal combustion engines Piston rings - Part 4: General specifications Moteursa combustion interne-Segments de piston- Partie4:Spécificationsgénerales Reference number IS06621-4:2015(E) LSO British Standards Institution @IS02015 quality and Standardization 5990390