ISO 18669-1:2021
(Main)Internal combustion engines — Piston pins — Part 1: General specifications
Internal combustion engines — Piston pins — Part 1: General specifications
This document specifies the essential dimensional characteristics of piston pins with a nominal outer diameter from 8 mm up to and including 100 mm, for reciprocating internal combustion engines for road vehicles and other applications. In certain applications, except road vehicles, and provided that mutual agreement is made between the customer and the manufacturer, this document can be used with suitable modifications. In addition, it establishes a vocabulary, a pin-type classification, material description based on mechanical properties, common features and quality requirements. The use of this document can require a manufacturer and customer statistical process control agreement.
Moteurs à combustion interne — Axes de pistons — Partie 1: Spécifications générales
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INTERNATIONAL ISO
STANDARD 18669-1
Third edition
2021-08
Internal combustion engines — Piston
pins —
Part 1:
General specifications
Moteurs à combustion interne — Axes de pistons —
Partie 1: Spécifications générales
Reference number
©
ISO 2021
© ISO 2021
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
ii © ISO 2021 – All rights reserved
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
3.1 General . 1
3.2 Geometrical and manufacturing features of piston pins . 1
3.2.1 Bore types . 1
3.2.2 Outside-edge configurations . 2
3.2.3 Other features . 3
4 Symbols . 3
5 Nomenclature . 4
5.1 Outside, inside and end features . 4
5.2 Outside edge and inside chamfer configurations . 6
5.2.1 Chamfered outside-edge configuration . 6
5.2.2 Double-chamfered outside-edge configuration . 6
5.2.3 Radiused outside-edge configuration . 7
5.2.4 Chamfer-locking outside-edge configuration . 7
5.3 Outside-edge drop-off configuration . 8
6 Codes . 9
7 Designation of piston pins .10
7.1 Designation elements and order .10
7.1.1 Mandatory elements .10
7.1.2 Additional elements .10
7.2 Designation examples .10
8 Piston pin types, dimensions and tolerances .11
8.1 Manufacturing types .11
8.2 Dimensions and tolerances .11
8.2.1 Outside diameter and form and location tolerances .11
8.2.2 Inside diameter tolerance .13
8.2.3 Length (l ) and gauge length (l ) tolerances .13
1 5
8.2.4 Outside-edge form .14
8.2.5 Inside-edge profile .15
8.2.6 Tapered bore dimensions .16
8.2.7 Centre-web dimensions (see Figure 17) .18
9 Material and heat treatment .18
9.1 Type of material .18
9.2 Core hardness l core strength .19
9.3 Carburised and nitrided case depth .20
9.4 Surface hardness .21
9.5 Volume change .21
10 Common features .22
10.1 Roughness of surfaces .22
10.1.1 Roughness of machined surfaces .22
10.1.2 Roughness of coated surfaces .22
10.1.3 Roughness of extruded and seamless drawn bore surfaces .23
10.2 Marking of piston pins .23
10.3 Miscellaneous .23
10.3.1 Cleanliness .23
10.3.2 Corrosion protection .23
10.3.3 Residual magnetism .23
10.3.4 Packaging.23
11 Quality requirements .24
11.1 Material characteristics .24
11.1.1 Decarburisation .24
11.1.2 Cementite network .24
11.1.3 Nitride coating .24
11.1.4 Grinder burn .24
11.2 Material defects .24
11.2.1 Cracks .24
11.2.2 Forming streaks .24
11.3 Visual defects .25
Bibliography .26
iv © ISO 2021 – All rights reserved
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).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions 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 third edition cancels and replaces the second edition (ISO 18669-1:2013), which has been
technically revised.
The main changes compared to the previous edi
...
INTERNATIONAL ISO
STANDARD 18669-1
Third edition
2021-08
Internal combustion engines — Piston
pins —
Part 1:
General specifications
Moteurs à combustion interne — Axes de pistons —
Partie 1: Spécifications générales
Reference number
©
ISO 2021
© ISO 2021
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
ii © ISO 2021 – All rights reserved
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
3.1 General . 1
3.2 Geometrical and manufacturing features of piston pins . 1
3.2.1 Bore types . 1
3.2.2 Outside-edge configurations . 2
3.2.3 Other features . 3
4 Symbols . 3
5 Nomenclature . 4
5.1 Outside, inside and end features . 4
5.2 Outside edge and inside chamfer configurations . 6
5.2.1 Chamfered outside-edge configuration . 6
5.2.2 Double-chamfered outside-edge configuration . 6
5.2.3 Radiused outside-edge configuration . 7
5.2.4 Chamfer-locking outside-edge configuration . 7
5.3 Outside-edge drop-off configuration . 8
6 Codes . 9
7 Designation of piston pins .10
7.1 Designation elements and order .10
7.1.1 Mandatory elements .10
7.1.2 Additional elements .10
7.2 Designation examples .10
8 Piston pin types, dimensions and tolerances .11
8.1 Manufacturing types .11
8.2 Dimensions and tolerances .11
8.2.1 Outside diameter and form and location tolerances .11
8.2.2 Inside diameter tolerance .13
8.2.3 Length (l ) and gauge length (l ) tolerances .13
1 5
8.2.4 Outside-edge form .14
8.2.5 Inside-edge profile .15
8.2.6 Tapered bore dimensions .16
8.2.7 Centre-web dimensions (see Figure 17) .18
9 Material and heat treatment .18
9.1 Type of material .18
9.2 Core hardness l core strength .19
9.3 Carburised and nitrided case depth .20
9.4 Surface hardness .21
9.5 Volume change .21
10 Common features .22
10.1 Roughness of surfaces .22
10.1.1 Roughness of machined surfaces .22
10.1.2 Roughness of coated surfaces .22
10.1.3 Roughness of extruded and seamless drawn bore surfaces .23
10.2 Marking of piston pins .23
10.3 Miscellaneous .23
10.3.1 Cleanliness .23
10.3.2 Corrosion protection .23
10.3.3 Residual magnetism .23
10.3.4 Packaging.23
11 Quality requirements .24
11.1 Material characteristics .24
11.1.1 Decarburisation .24
11.1.2 Cementite network .24
11.1.3 Nitride coating .24
11.1.4 Grinder burn .24
11.2 Material defects .24
11.2.1 Cracks .24
11.2.2 Forming streaks .24
11.3 Visual defects .25
Bibliography .26
iv © ISO 2021 – All rights reserved
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).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions 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 third edition cancels and replaces the second edition (ISO 18669-1:2013), which has been
technically revised.
The main changes compared to the previous edi
...
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