ISO 21433:2025
(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
General Information
Standards Content (Sample)
International
Standard
ISO 21433
Second edition
Plain bearings — Handling of plain
2025-10
bearings
Paliers lisses — Manipulation des paliers lisses
Reference number
© ISO 2025
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ii
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
7.3 Replacement by new plain bearings .7
Bibliography . 9
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.
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This document was prepared by Technical Committee ISO/TC 123, Plain bearings, Subcommittee SC 6, Terms
and common items.
This second edition cancels and replaces the first edition (ISO 21433:2018), of which it constitutes minor
revision.
The main changes are as follows:
— the terminology has been unified;
— in the Bibliography, ISO 12843 has been added and uncited standards has been deleted.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
v
Introduction
The purpose of this document is to give appropriate methods of handling plain bearings. Alternative
practises may be adopted as agreed between bearing suppliers and their customers.
Inappropriate handling can cause premature damage to bearings and
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