ISO 6626-1:2024

Internal combustion engines — Piston rings — Part 1: Coil spring loaded oil control rings made of cast iron

ISO 6626-1:2024

Name:ISO 6626-1:2024   Standard name:Internal combustion engines — Piston rings — Part 1: Coil spring loaded oil control rings made of cast iron
Standard number:ISO 6626-1:2024   language:English language
Release Date:21-Jul-2024   technical committee:ISO/TC 22/SC 34 - Propulsion, powertrain and powertrain fluids
Drafting committee:ISO/TC 22/SC 34/WG 4 - Piston rings   ICS number:43.060.10 - Engine block and internal components

International
Standard
ISO 6626-1
First edition
Internal combustion engines —
2024-07
Piston rings —
Part 1:
Coil spring loaded oil control rings
made of cast iron
Moteurs à combustion interne — Segments de piston —
Partie 1: Anneaux de contrôle de l'huile à ressort hélicoïdal en fonte
Reference number
© ISO 2024
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Published in Switzerland
ii
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Overview . 1
5 Piston ring types and designation . 2
5.1 Types DSF-C, DSF-CNP, SSF, GSF, DSF, DSF-NG and SSF-L — General features and
dimensions .2
5.2 Type DSF-C ─ Coil-spring loaded bevelled edge oil control ring, chromium plated and
profile ground .2
5.2.1 General features and dimensions .2
5.2.2 Example designation of a type DSF-C piston ring in accordance with this
document .3
5.3 Type DSF-CNP ─ Coil-spring loaded bevelled edge oil control ring, chromium plated
not profile ground .3
5.3.1 General features and dimensions .3
5.3.2 Example designation of a type DSF-CNP piston ring in accordance with this
document .4
5.4 Type SSF ─ Coil-spring loaded slotted oil control ring .4
5.4.1 General features and dimensions .4
5.4.2 Example designation of a type SSF piston ring in accordance with this document .5
5.5 Type GSF ─ Coil-spring loaded double bevelled oil control ring .5
5.5.1 General features and dimensions .5
5.5.2 Example designation of a type GSF piston ring in accordance with this document .6
5.6 Type DSF ─ Coil-spring loaded bevelled edge oil control ring .6
5.6.1 General features and dimensions .6
5.6.2 Example designation of a type DSF piston ring in accordance with this document .7
5.7 Type DSF-NG ─ Coil-spring loaded bevelled edge oil control ring (face geometry similar
to type DSF-C or type DSF-CNP) .7
5.7.1 General features and dimensions .7
5.7.2 Example designation of a type DSF-NG piston ring in accordance with this
document .8
5.8 Type SSF-L ─ Coil-spring loaded slotted oil control ring with h1 = 4,75 mm (3/16 in)
ring width and 0,6 mm nominal land width.8
5.8.1 General features and dimensions .8
5.8.2 Example designation of a type SSF-L piston ring in accordance with this
document .9
6 Common features . 9
6.1 Oil drainage by slots or holes .9
6.1.1 Arrangement of slots .9
6.1.2 Slot length .11
6.1.3 Arrangement of holes .11
6.1.4 Diameter and number of holes .11
6.2 Plating thickness — DSF-C and DSF-CNP Coil-spring loaded oil control rings .11
6.3 Peripheral edges at gap of chromium plated oil control rings . 12
6.4 Spring groove and land offsets. 12
7 Coil springs .12
7.1 Types of coil spring . 12
7.2 Latch pin and location of small pitch in the coil spring .14
7.3 Coil spring excursion (extended gap) .14
7.4 Position of coil spring gap and fixing . 15

iii
7.5 Material . 15
8 Tangential force and nominal contact pressure .15
8.1 Tangential force, F . 15
t
8.1.1 Force factors . 15
8.1.2 General tangential force, F .16
t
8.1.3 Actual tangential force, F , and tolerance .16
t
8.1.4 Normalized tangential force, F .16
N
8.2 Nominal contact pressure, p .16
o
9 Dimensions .16
Annex A (informative) Historical classes of nominal contact pressure, p .78
o
Bibliography .80

iv
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
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related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 34,
Propulsion, powertrain and powertrain fluids.
This first edition cancels and replaces ISO 6626:1989, which has been technically revised.
The main changes are as follows:
— classes of nominal contact pressure were moved to Annex A and the normalized tangential force was
introduced;
— verification and correction of figures;
— update of dimension Tables 8 to 25.
A list of all parts in the ISO 6626 series
...

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