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Standard
ISO 6621-4
Fourth edition
Internal combustion engines —
2024-05
Piston rings —
Part 4:
General specifications
Moteurs à combustion interne — Segments de piston —
Partie 4: Spécifications générales
Reference number
ISO 6621-4:2024(en) © ISO 2024
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ISO 6621-4:2024(en)
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Published in Switzerland
© ISO 2024 – All rights reserved
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ISO 6621-4:2024(en)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Piston ring codes . 1
5 Designation of piston rings . 4
5.1 Designation elements and order .4
5.1.1 General .4
5.1.2 Mandatory elements .4
5.1.3 Measurement principles .5
5.1.4 Additional elements .5
5.1.5 Elements for additional marking .5
5.2 Designation examples .5
5.2.1 Designation example of a piston ring in accordance with ISO 6622-1 .5
5.2.2 Designation example of a piston ring in accordance with ISO 6624-1 .5
5.2.3 Designation example of a piston ring in accordance with ISO 6626-1 .6
6 Designation of piston rings . 6
6.1 General .6
6.2 Mandatory topside identification marking .
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