ISO 21433
(Main)Plain bearings — Handling of plain bearings
Plain bearings — Handling of plain bearings
This document specifies requirements and guidance on the storage, transportation, handling, installation, operation and replacement of plain bearings and related parts.
Paliers lisses — Manipulation des paliers lisses
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FINAL DRAFT
International
Standard
ISO/FDIS 21433
ISO/TC 123/SC 6
Plain bearings — Handling of plain
Secretariat: JISC
bearings
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Paliers lisses — Manipulation des paliers lisses
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WITH THEIR COMMENTS, NOTIFICATION OF ANY
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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 21433:2025(en) © ISO 2025
FINAL DRAFT
ISO/FDIS 21433:2025(en)
International
Standard
ISO/FDIS 21433
ISO/TC 123/SC 6
Plain bearings — Handling of plain
Secretariat: JISC
bearings
Voting begins on:
Paliers lisses — Manipulation des paliers lisses
Voting terminates on:
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.
© ISO 2025
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 21433:2025(en) © ISO 2025
ii
ISO/FDIS 21433:2025(en)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Storage and transportation . 1
4.1 General .1
4.2 Storage and transportation by packing .1
4.2.1 General .1
4.2.2 Purpose of packing .1
4.2.3 Packing method .2
4.2.4 Packing material .2
4.2.5 Unpacking .2
4.3 Storage and transportation in containers .2
4.3.1 General .2
4.3.2 Purpose of storage and transportation in containers .2
4.3.3 Points to notice at storage and transportation .3
4.3.4 Other methods of storage and transportation .3
4.3.5 Attachment of test and quality certificate .3
4.4 Selection of rust inhibitors and cleaning agents .3
4.5 Storage environment . .3
4.5.1 Warehouse or storage room .3
4.5.2 Ambient temperature of storage room .3
4.5.3 Environmental humidity for storage room .3
4.5.4 First-in first-out .3
4.6 Handling .4
4.7 Documentation .4
5 Method of installation of plain bearings . 4
5.1 Points to consider during plain bearings installation .4
5.1.1 Plain bearings .4
5.1.2 Housing .4
5.1.3 Press-fit method .4
5.1.4 Screw–fixing method .5
5.1.5 Keyed joint method .5
5.1.6 Retaining ring fixing method .5
5.1.7 Shrink fitting by cooling .5
5.1.8 Shrink fitting by heating .5
5.1.9 Points to notice during installation of plain bearings .5
5.1.10 Points to notice after installation of plain bearings .6
5.2 Mating shaft and assembly inspection .6
5.2.1 Mating shaft .6
5.2.2 Installation of shaft .6
5.2.3 Check of operation .6
6 Operation . 6
6.1 Cleaning (flushing) of lubrication system .6
6.2 Running-in .6
6.3 Supervision during operation .7
6.3.1 Control and check items.7
6.3.2 Record .7
7 Replacement of plain bearings . 7
7.1 General .7
7.2 Dismounting of plain bearings .7
iii
ISO/FDIS 21433:2025(en)
7.3 Replacement by new plain bearings .7
Bibliography . 9
iv
ISO/FDIS 21433:2025(en)
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 t
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Style Definition
ISO /FDIS 21433:2025 (en)
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ISO/TC 123/SC 6
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Secretariat: JISC
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Date: YYYY-MM-DD2025-06-30
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Plain bearings — Handling of plain bearings
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Paliers lisses — Manipulation des paliers lisses
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This document is not an ISO International Standard. It is distributed for review and comment. It is subject to
change without notice and may not be referred to as an International Standard.
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 supporting documentation.
A model document of an International Standard (the Model International Standard) is available at:
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CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
Formatted: French (Switzerland)
EmailE-mail: copyright@iso.org
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Website: www.iso.orgwww.iso.org
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Published in Switzerland
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iv © ISO #### 2025 – All rights reserved
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ISO #####-#:####(X/FDIS 21433:2025(en)
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Contents
Line spacing: single
Foreword . vii
Introduction . viii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Storage and transportation . 1
5 Method of installation of plain bearings . 4
6 Operation . 7
7 Replacement of plain bearings . 7
Bibliography . 9
Foreword . v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Storage and transportation . 1
4.1 General . 1
4.2 Storage and transportation by packing . 1
4.2.1 General . 1
4.2.2 Purpose of packing . 1
4.2.3 Packing method . 2
4.2.4 Packing material . 2
4.2.5 Unpacking . 2
4.3 Storage and transportation in containers . 2
4.3.1 General . 2
4.3.2 Purpose of storage and transportation in containers . 2
4.3.3 Points to notice at storage and transportation . 3
4.3.4 Other methods of storage and transportation . 3
4.3.5 Attachment of test and quality certificate . 3
4.4 Selection of rust inhibitors and cleaning agents . 3
4.5 Storage environment . 3
4.5.1 Warehouse or storage room . 3
4.5.2 Ambient temperature of storage room . 3
4.5.3 Environmental humidity for storage room . 3
4.5.4 First-in first-out . 4
4.6 Handling . 4
4.7 Documentation . 4
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5 Method of installation of plain bearings . 4
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5.1 Points to consider during plain bearings installation . 4
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5.1.1 Plain bearings . 4
5.1.2 Housing . 4
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5.1.3 Press-fit method. 4
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5.1.4 Screw –fixing method . 5
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v
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5.1.5 Keyed joint method . 5
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5.1.6 Retaining ring fixing method . 5
5.1.7 Shrink fitting by cooling . 5
5.1.8 Shrink fitting by heating . 5
5.1.9 Points to notice during installation of plain bearings . 5
5.1.10 Points to notice after installation of plain bearings . 6
5.2 Mating shaft and assembly inspection . 6
5.2.1 Mating shaft . 6
5.2.2 Installation of shaft . 6
5.2.3 Check of operation . 6
6 Operation . 6
6.1 Cleaning (flushing) of lubrication system . 6
6.2 Running-in . 6
6.3 Supervision during operation . 6
6.3.1 Control and check items . 6
6.3.2 Record . 7
7 Replacement of plain bearings . 7
7.1 General . 7
7.2 Dismounting of plain bearings . 7
7.3 Replacement by new plain bearings . 7
Bibliography . 9
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pt, Line spacing: single
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vi © ISO #### 2025 – All rights reserved
vi
ISO #####-#:####(X/FDIS 21433:2025(en)
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Line spacing: single
Foreword
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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 t
...
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