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ISO 6621-4:2024

(Main)

Internal combustion engines — Piston rings — Part 4: General specifications

Internal combustion engines — Piston rings — Part 4: General specifications

This document specifies the general characteristics of piston rings for reciprocating internal combustion engines for road vehicles and other applications (the individual dimensional criteria for these rings are given in the relevant International Standards). It also provides a system for ring coding, designation, and marking. It is applicable to all such rings of a nominal diameter from 30 mm up to and including 200 mm.

Moteurs à combustion interne — Segments de piston — Partie 4: Spécifications générales

General Information

Status
Published
Publication Date
30-Apr-2024
ICS
43.060.10 - Engine block and internal components
Technical Committee
ISO/TC 22/SC 34 - Propulsion, powertrain and powertrain fluids
Drafting Committee
ISO/TC 22/SC 34/WG 4 - Piston rings
Current Stage
6060 - International Standard published
Start Date
01-May-2024
Due Date
18-Feb-2024
Completion Date
01-May-2024
Ref Project

Relations

Revises
ISO 6621-4:2015 - Internal combustion engines — Piston rings — Part 4: General specifications
Effective Date
04-Sep-2021

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ISO 6621-4:2024 - Internal combustion engines — Piston rings — Part 4: General specifications Released:1. 05. 2024ISO 6621-4:2024 - Internal combustion engines — Piston rings — Part 4: General specifications Released:1. 05. 2024
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ISO/FDIS 6621-4 - Internal combustion engines — Piston rings — Part 4: General specifications Released:4. 01. 2024ISO/FDIS 6621-4 - Internal combustion engines — Piston rings — Part 4: General specifications Released:4. 01. 2024
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REDLINE ISO/FDIS 6621-4 - Internal combustion engines — Piston rings — Part 4: General specifications Released:4. 01. 2024REDLINE ISO/FDIS 6621-4 - Internal combustion engines — Piston rings — Part 4: General specifications Released:4. 01. 2024
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Standards Content (Sample)

International
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

---------------------- Page: 1 ----------------------
ISO 6621-4:2024(en)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2024
All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland

© ISO 2024 – All rights reserved
ii

---------------------- Page: 2 ----------------------
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 .
...

FINAL DRAFT
International
Standard
ISO/FDIS 6621-4
ISO/TC 22/SC 34
Internal combustion engines —
Secretariat: ANSI
Piston rings —
Voting begins on:
2024-01-18
Part 4:
General specifications
Voting terminates on:
2024-03-14
Moteurs à combustion interne — Segments de piston —
Partie 4: Spécifications générales
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
ISO/FDIS 6621-4:2024(en) © ISO 2024

---------------------- Page: 1 ----------------------
FINAL DRAFT
ISO/FDIS 6621-4:2024(en)
International
Standard
ISO/FDIS 6621-4
ISO/TC 22/SC 34
Internal combustion engines —
Secretariat: ANSI
Piston rings —
Voting begins on:
Part 4:
General specifications
Voting terminates on:
Moteurs à combustion interne — Segments de piston —
Partie 4: Spécifications générales
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
COPYRIGHT PROTECTED DOCUMENT
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
© ISO 2024
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland Reference number
ISO/FDIS 6621-4:2024(en) © ISO 2024

© ISO 2024 – All rights reserved
ii

---------------------- Page: 2 ----------------------
ISO/FDIS 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 .
...

2023-10-26
ISO/FDIS 6621--4:2023(E)
ISO/TC 22/SC 34/WG 4
Secretariat: ANSI
Date: 2023-10-262024-01-03
Internal combustion engines — Piston rings — —
Part 4:
General specifications
Moteurs à combustion interne — Segments de piston —
Partie 4: Spécifications générales
FDIS stage
© ISO 2023 – All rights reserved

---------------------- Page: 1 ----------------------
ISO/FDIS 6621-4:20232024(E)
© ISO 2023 2024
All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
EmailE-mail: copyright@iso.org
Website: www.iso.org
Published in Switzerland
© ISO 2023 2024 – All rights reserved

ii

---------------------- Page: 2 ----------------------
ISO/FDIS 6621-4:20232024(E)
Contents
Foreword . vi
Introduction .vi i
Part 4: General specifications . 1
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 . 6
5.2 Designation examples . 6
5.2.1 Designation example of a piston ring in accordance with ISO 6622-1 . 6
5.2.2 Designation example of a piston ring in accordance with ISO 6624-1 . 6
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 . 7
6.3 Additional marking .
...

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