ISO 5593:2023
(Main)Rolling bearings — Vocabulary
Rolling bearings — Vocabulary
This document defines terms applied in the field of rolling bearings and their technology. This document includes terms related to all types of rolling bearings wherein the principal degree of freedom is continuous rotation around an axis enabled by an ordered set of rolling elements between two circular raceways such that loads can be transmitted between them in a particular range of either radial or axial directions, or both. This document also includes accessories to these products. The following types of terms are not included: — terms specified in ISO 76, ISO 281 and ISO 1132-1; — terms which are narrowly applied in only one specialized rolling bearing International Standard.
Roulements — Vocabulaire
Le présent document définit les termes appliqués dans le domaine des roulements et de leur technologie. Le présent document contient des termes associés à tous les types de roulements dans lesquels le principal degré de liberté est une rotation continue autour d'un axe, rendue possible par un ensemble ordonné d'éléments roulants entre deux chemins de roulement circulaires, de telle sorte que les charges puissent être transmises entre eux dans une plage particulière de directions radiales, axiales, ou les deux. Le présent document inclut également les accessoires associés à ces produits. Les types de termes suivants ne sont pas inclus: — les termes spécifiés dans les ISO 76, ISO 281 et ISO 1132‑1; — les termes qui ne sont utilisés que dans une Norme internationale spécialisée relative aux roulements.
Kotalni ležaji - Slovar
Ta dokument določa izraze, ki se uporabljajo na področju krogličnih ležajev in njihove tehnologije.
Ta dokument vključuje izraze, povezane z vsemi vrstami krogličnih ležajev, pri katerih je glavna prostostna stopnja neprekinjeno vrtenje okoli osi, ki ga omogoča urejen niz krogličnih elementov med dvema krožnima tirnicama, tako da se med njima lahko prenašajo obremenitve v določenem območju radialne ali aksialne smeri ali obeh. Ta dokument vključuje tudi dodatno opremo za te izdelke.
Naslednje vrste izrazov niso vključene:
– izrazi, navedeni v standardih ISO 76, ISO 281 in ISO 1132-1;
– izrazi, ki se ozko uporabljajo samo v enem specializiranem mednarodnem standardu za kroglične ležaje.
General Information
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Buy Standard
Standards Content (Sample)
SLOVENSKI STANDARD
SIST ISO 5593:2023
01-april-2023
Kotalni ležaji - Slovar
Rolling bearings - Vocabulary
Roulements - Vocabulaire
Ta slovenski standard je istoveten z: ISO 5593:2023
ICS:
01.040.21 Mehanski sistemi in deli za Mechanical systems and
splošno rabo (Slovarji) components for general use
(Vocabularies)
21.100.20 Kotalni ležaji Rolling bearings
SIST ISO 5593:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST ISO 5593:2023
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SIST ISO 5593:2023
INTERNATIONAL ISO
STANDARD 5593
Fourth edition
2023-02
Rolling bearings — Vocabulary
Roulements — Vocabulaire
Подшипники качения — Словарь
Reference number
ISO 5593:2023(E)
© ISO 2023
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SIST ISO 5593:2023
ISO 5593:2023(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
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
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SIST ISO 5593:2023
ISO 5593:2023(E)
Contents Page
Foreword .iv
Introduction .v
1 S c op e . 1
2 Nor m at i ve r ef er enc e s . 1
3 Terms and definitions . 1
3.1 Mechanical bearings . 1
3.1.1 Rolling bearings . 1
3.1.2 R adial bearings . 7
3.1.3 Thrust bearings . 9
3.1.4 Ball bearings . 10
3.1.5 Roller bearings .15
3.2 B earing parts . 18
3.2.1 G eneral . 18
3.2.2 F eatures of bearing parts . 21
3.2.3 B earing rings . 23
3.2.4 B earing washers .26
3 . 2 . 5 R ol l i n g element s .28
3.2.6 Cages . 31
3.3 B earing arrangements and subunits . 33
3.3.1 Bearing arrangements . 33
3 . 3 . 2 Subu n it s .34
3.3.3 Rolling element and cage assemblies . 35
3.4 D imensions and feature identifications . 36
3.4.1 D imension plans, series and other feature identifications .36
3.4.2 Planes . 37
3.4.3 Boundary dimensions .38
3.4.4 Dimensions of subunits and parts .40
3.5 D imensions associated with tolerances . 43
3.5.1 Widths of inner and outer rings . 43
3 . 5 . 2 R ol ler d i men s ion s . 43
3.5.3 Internal clearance .44
3.6 T orque, loads and life .44
3.6.1 Torque .44
3.6.2 Actual loads . .44
3.6.3 Equivalent loads .46
3.6.4 Life .46
3.6.5 C alculation factors .46
3.7 Miscellaneous . 47
3.7.1 Housings and bearing units . 47
3.7.2 Location and securing .49
Bibliography . 100
Index . 101
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SIST ISO 5593:2023
ISO 5593:2023(E)
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 4, Rolling bearings.
This fourth edition cancels and replaces the third edition (ISO 5593:2019), which has been technically
revised.
The main changes compared to the previous edition are as follows: some definitions, figures and notes
have been modified.
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.
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SIST ISO 5593:2023
ISO 5593:2023(E)
Introduction
0.1 General
This document provides a list of terms and associated descriptions that are commonly applied in the
field of rolling bearings and their technology. The document contains a list of terms which have found
general acceptance and a common usage.
This document also includes terms which are precisely defined in other rolling bearing standards in the
rolling bearing industry.
ISO/TC 4 standards associated with GPS published after this document can contain additional terms
and definitions.
0.2 Organization of the vocabulary
This document contains:
— terms, with their definition, in mixed order and grouped by topic;
— figures with index numbers of relevant terms;
— alphabetical listings of the terms, with their index numbers.
0.3 Organization of the figures
The figures are principally arranged in the same order as the terms they illustrate.
Each figure gives the index numbers of relevant terms. A figure usually shows only one example of
several existing forms of a bearing or part. In most cases, the figures are simplified and leave out
unnecessary details.
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SIST ISO 5593:2023
INTERNATIONAL STANDARD ISO 5593:2023(E)
Rolling bearings — Vocabulary
1 S cope
This document defines terms applied in the field of rolling bearings and their technology.
This document includes terms related to all types of rolling bearings wherein the principal degree of
freedom is continuous rotation around an axis enabled by an ordered set of rolling elements between
two circular raceways such that loads can be transmitted between them in a particular range of either
radial or axial directions, or both. This document also includes accessories to these products.
The following types of terms are not included:
— terms specified in ISO 76, ISO 281 and ISO 1132-1;
— terms which are narrowly applied in only one specialized rolling bearing International Standard.
2 Normat ive references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1 Mechanical bearings
3.1.1 Rolling bearings
3.1.1.1
bearing
mechanical component by means of which a moving part in relative motion is supported and/or guided
with respect to other parts of a mechanism
3.1.1.2
rolling bearing
bearing operating with rolling (rather than sliding) motion between the parts supporting load and
moving in relation to each other
Note 1 to entry: See Figures 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27,
28, 29, 30, 31, 32 and 33.
Note 2 to entry: It comprises raceway members and rolling elements with or without means for either their
spacing or guiding, or both.
Note 3 to entry: It may be designed to support radial load, axial load or combined radial and axial load.
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ISO 5593:2023(E)
3.1.1.3
single-row bearing
single-row rolling bearing
rolling bearing with one row of rolling elements
Note 1 to entry: See Figures 1, 2, 3, 4, 6, 8, 9, 10, 11, 12, 13, 14, 15, 17, 21, 22, 23, 24, 27, 28, 29, 30, 31 and 158.
3.1.1.4
double-row bearing
double-row rolling bearing
rolling bearing with two rows of rolling elements
Note 1 to entry: See Figures 5, 7, 16, 20, 25 and 26.
3.1.1.5
multi-row bearing
multi-row rolling bearing
rolling bearing with more than two rows of rolling elements
Note 1 to entry: See Figure 19.
Note 2 to entry: It is preferable to specify the number of rows and type of bearing, for example, “four-row (radial)
cylindrical roller bearing”.
3.1.1.6
insert bearing
insert ball bearing
radial ball bearing with a spherical outside surface and an extended inner ring with a locking device
Note 1 to entry: See Figure 8.
Note 2 to entry: It is technically possible to have insert bearings with rollers as rolling elements. Such bearings
are however so rare that, for practical use in the bearing industry, the terms “insert bearing” and “insert ball
bearing” are considered to be synonymous.
3.1.1.7
full complement bearing
full complement rolling bearing
rolling bearing in which the sum of the clearances between the rolling elements in each row is less than
the diameter of the rolling elements
Note 1 to entry: See Figures 14, 22, 23 and 157.
Note 2 to entry: Full complement bearings are without a cage or separators usually.
Note 3 to entry: The sum of the clearances between the rolling elements in each row is small enough to give
satisfactory function of the bearing.
3.1.1.8
angular contact bearing
angular contact rolling bearing
rolling bearing designed to support a combination of radial and axial loads
Note 1 to entry: See Figures 4, 5, 7, 9, 10, 12, 16, 17, 20, 21, 27, 29 and 31.
3.1.1.9
rigid bearing
rigid rolling bearing
rolling bearing which resists angular misalignment between the axes of its raceways
Note 1 to entry: See Figures 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 17, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29 and 30.
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ISO 5593:2023(E)
3.1.1.10
self-aligning bearing
self-aligning rolling bearing
rolling bearing which can accommodate angular misalignment and angular motion between the axes of
its rings or washers due to one raceway being spherical
Note 1 to entry: See Figures 7, 15, 16, 31 and 158.
3.1.1.11
external-aligning bearing
external-aligning rolling bearing
rolling bearing which can accommodate angular misalignment between its axis and the axis of its
housing by means of a spherical form on one ring or washer surface, which mates with a complementary
seat surface in an aligning housing ring, in an aligning seat washer or in the housing
Note 1 to entry: See Figures 8, 58 and 120.
3.1.1.12
separable bearing
separable rolling bearing
rolling bearing with separable bearing ring or other subunits
Note 1 to entry: See Figures 6, 9, 10, 11, 12, 13, 14, 19, 21, 24, 25, 26, 28, 29, 30, 31, 35, 36, 39, 40 and 41.
3.1.1.13
non-separable bearing
non-separable rolling bearing
rolling bearing from which, after final manufacturing assembly, neither of its bearing ring can be freely
separated
Note 1 to entry: See Figures 1, 2, 3, 4, 5, 7, 8, 15, 16, 17, 20, 22, 23 and 27.
3.1.1.14
split bearing
split rolling bearing
rolling bearing with rings and the cage, when used, divided into two semi-circular pieces to facilitate
mounting
Note 1 to entry: See Figure 18.
3.1.1.15
metric bearing
metric rolling bearing
rolling bearing designed with boundary dimensions and tolerances in metric units
3.1.1.16
metric series bearing
metric series rolling bearing
metric rolling bearing which conforms to the ISO dimension plan
3.1.1.17
inch bearing
inch rolling bearing
rolling bearing designed with boundary dimensions and tolerances in inches
3.1.1.18
inch series bearing
inch series rolling bearing
inch rolling bearing which conforms to an inch dimension plan
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ISO 5593:2023(E)
3.1.1.19
open bearing
open rolling bearing
rolling bearing with neither seals nor shields
Note 1 to entry: See Figures 1, 4, 5, 6, 7, 9, 10, 11, 12, 13, 15, 16, 17, 18, 19, 21, 24, 25, 26, 27, 28, 29, 30 and 31.
3.1.1.20
sealed bearing
sealed rolling bearing
rolling bearing which is fitted with a seal on one or both sides
Note 1 to entry: See Figures 2, 8 and 20.
3.1.1.21
shielded bearing
shielded rolling bearing
rolling bearing which is fitted with a shield on one or both sides
Note 1 to entry: See Figure 3.
3.1.1.22
capped bearing
capped rolling bearing
rolling bearing which is fitted with one or two seals, one or two shields or with one seal and one shield
Note 1 to entry: See Figures 2, 3, 8 and 20.
3.1.1.23
pre-lubricated bearing
pre-lubricated rolling bearing
rolling bearing which has been charged with lubricant by the manufacturer
3.1.1.24
airframe bearing
airframe rolling bearing
rolling bearing which, by reason of design or execution, is intended for use in the general structure of
an aircraft, including its control systems
3.1.1.25
instrument precision bearing
instrument precision rolling bearing
rolling bearing which, by reason of design or execution, is intended for use in instruments
3.1.1.26
railway axlebox bearing
railway axlebox rolling bearing
rolling bearing which, by reason of design or execution, is intended for use in railway axleboxes
Note 1 to entry: See Figure 20.
3.1.1.27
matched bearing
matched rolling bearing
rolling bearing in a matched pair or a matched stack
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ISO 5593:2023(E)
3.1.1.28
coated bearing
coated rolling bearing
rolling bearing with one or more bearing rings or bearing washers and/or the rolling elements fully or
partly covered (coated) by means of a specifically defined surface coating method
Note 1 to entry: See Figures 114 and 115.
Note 2 to entry: The coating may also be applied to additional integral bearing parts such as cages and shields
but, if only the additional integral bearing parts are coated, the term “coated bearing” should not be used.
3.1.1.29
insulated bearing
insulated rolling bearing
rolling bearing which prevents the passage of electric current and/or the equalization of different
voltage potentials in a given insulation class
Note 1 to entry: See Figures 114, 115, 116 and 117.
Note 2 to entry: Commonly, either the bearing outside surface, faces and chamfers of the outer ring or the bearing
bore, faces and chamfers of the inner ring are provided with an insulating layer of, for example, oxide ceramics or
polymer resins.
Note 3 to entry: The insulation can, alternatively, be provided by means of the rolling elements if they are all
made of a non-conductive material, for example as in some types of hybrid bearings.
3.1.1.30
hybrid bearing
hybrid rolling bearing
rolling bearing in which the rolling elements are made of ceramic material and at least one bearing ring
or bearing washer is made of bearing steel
Note 1 to entry: See Figure 116.
Note 2 to entry: Hybrid bearings for some special applications have a limited number of their rolling elements
made of ceramic material with the remainder being made of bearing steel.
3.1.1.31
ceramic bearing
ceramic rolling bearing
rolling bearing in which the bearing rings/washers and the rolling elements are made of ceramic
material
Note 1 to entry: See Figure 117.
3.1.1.32
sensor bearing
sensor rolling bearing
sensorized bearing
sensorized rolling bearing
rolling bearing with one or more integrated sensors which consist of either electromechanical or
electronic, or both type of components
Note 1 to entry: See Figure 118.
Note 2 to entry: Temperature, speed, displacement, vibration and forces are typical items that can be monitored.
Note 3 to entry: Signal transfer to evaluation equipment is generally via cable, but can be by wireless connection.
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SIST ISO 5593:2023
ISO 5593:2023(E)
3.1.1.33
heat stabilized bearing
heat stabilized rolling bearing
rolling bearing able to withstand specified exposure temperatures and maintain dimensional stability
Note 1 to entry: Achieved by tempering components.
3.1.1.34
combined bearing
combined rolling bearing
rolling bearing which has two sets of rolling elements in a bearing individually supporting radial load
and axial load respectively
Note 1 to entry: See Figure 119.
3.1.1.35
duplex bearing
duplex rolling bearing
stack of two rolling bearings selected or manufactured to have predetermined characteristics when
mounted together
Note 1 to entry: See Figures 77, 78 and 79.
3.1.1.36
face-to-face duplex bearing
face-to-face duplex rolling bearing
duplex bearing matched in X-arrangement
stack of two matched bearings mounted with the front faces of their outer rings in contact with each
other
Note 1 to entry: See Figure 78.
Note 2 to entry: See 3.3.1.4.
3.1.1.37
tandem duplex bearing
tandem duplex rolling bearing
stack of two matched bearings mounted with the back face of the outer ring of one bearing in contact
with the front face of the outer ring of the next bearing
Note 1 to entry: See Figure 79.
Note 2 to entry: See 3.3.1.5.
3.1.1.38
back-to-back duplex bearing
back-to-back duplex rolling bearing
duplex bearing matched in O-arrangement
stack of two matched bearings mounted with the back faces of their outer rings in contact with each
other
Note 1 to entry: See Figure 77.
Note 2 to entry: See 3.3.1.3.
3.1.1.39
bearing with interchangeable subunit
rolling bearing with interchangeable subunit
rolling bearing designed and manufactured so that its function is kept properly when any subunit from
the same group of separable (rolling) bearings is assembled with it
Note 1 to entry: Refer to interchangeable subunit (3.3.2.2).
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SIST ISO 5593:2023
ISO 5593:2023(E)
3.1.1.40
bearing with non-interchangeable subunit
rolling bearing with non-interchangeable subunit
rolling bearing having a subunit with which it is uniquely paired and not designed and manufactured
to keep its function when assembled with a subunit from any other of the same group of the separable
rolling bearings
Note 1 to entry: Refer to non-interchangeable subunit (3.3.2.3).
3.1.2 Radial bearings
3.1.2.1
radial bearing
radial rolling bearing
rolling bearing designed to support primarily radial load
Note 1 to entry: See Figures 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22 and 23.
Note 2 to entry: Some radial rolling bearings are designed to support a pure radial or axial load as well as a
combination of radial and axial loads.
Note 3 to entry: Its principal parts are inner ring, outer ring and rolling elements with or without a cage.
3.1.2.2
radial contact bearing
radial contact rolling bearing
rolling bearing designed to support primarily a radial load, having a nominal contact angle of 0°
Note 1 to entry: See Figures 1, 2, 3, 8, 11, 13, 14, 15, 18, 19, 22 and 23.
3.1.2.3
angular contact radial bearing
angular contact radial rolling bearing
rolling bearing designed to support primarily a combined radial and axial load
Note 1 to entry: See Figures 4, 5, 7, 9, 10, 12, 16, 17, 20 and 21.
3.1.2.4
tapered bore bearing
tapered bore rolling bearing
radial rolling bearing having an inner ring with tapered bore
Note 1 to entry: See Figures 7 and 19.
3.1.2.5
flanged bearing
flanged rolling bearing
radial rolling bearing with an external radial flange on one of its rings, usually the outer ring
Note 1 to entry: See Figure 21.
3.1.2.6
track roller
track roller rolling bearing
radial rolling bearing with a heavy section outer ring, intended for use as a roller to roll on a track
Note 1 to entry: See Figures 22 and 23.
Note 2 to entry: It is intended for use as a roller to roll on a cam track.
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ISO 5593:2023(E)
3.1.2.7
yoke-type track roller
yoke-type track roller rolling bearing
track roller rolling bearing intended for mounting in a yoke
Note 1 to entry: See Figure 22.
3.1.2.8
stud-type track roller
stud-type track roller rolling bearing
track roller rolling bearing in which the inner member is extended on one side in the form of a shaft for
cantilever mounting of the bearing
Note 1 to entry: See Figure 23.
3.1.2.9
universal matching bearing
universal matching rolling bearing
radial rolling bearing which, when used together with one or more similar bearing(s), selected at
random, yields predetermined characteristics in a paired or stack mounting
3.1.2.10
bearing with cylindrical bore
rolling bearing with cylindrical bore
radial rolling bearing having an inner ring with cylindrical bore
Note 1 to entry: See Figures 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 20, 21 and 22.
3.1.2.11
bearing with cylindrical outside surface
rolling bearing with cylindrical outside surface
radial rolling bearing with an outer ring with cylindrical outside surface
Note 1 to entry: See Figures 1, 2, 3, 4, 5, 6, 7, 9, 10, 11, 12, 13, 14, 15, 16, 17, 19 and 20.
3.1.2.12
bearing with spherical outside surface
rolling bearing with spherical outside surface
radial rolling bearing with an outer ring with spherical outside surface
Note 1 to entry: See Figures 8, 46 and 58.
3.1.2.13
bearing with locating snap ring groove
rolling bearing with locating snap ring groove
rolling bearing having a snap ring groove in the outer ring outside surface
Note 1 to entry: See Figure 97.
3.1.2.14
bearing with locating snap ring
rolling bearing with locating snap ring
rolling bearing having a locating snap ring fitted in a groove on the outer ring outside surface
Note 1 to entry: See Figure 34.
3.1.2.15
bearing with adapter sleeve assembly
rolling bearing with adapter sleeve assembly
rolling bearing combined
...
INTERNATIONAL ISO
STANDARD 5593
NORME
Fourth edition
INTERNATIONALE
Quatrième édition
Четвертое издание
2023-02
МЕЖДУНАРОДНЫЙ
СТАНДАРТ
Rolling bearings — Vocabulary
Roulements — Vocabulaire
Подшипники качения — Словарь
Reference number
Numéro de référence
Ссылочный номер
ISO 5593:2023(E/F/R)
© ISO 2023
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© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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INTERNATIONAL ISO
STANDARD 5593
Fourth edition
2023-02
Rolling bearings — Vocabulary
Roulements — Vocabulaire
Подшипники качения — Словарь
Reference number
ISO 5593:2023(E)
© ISO 2023
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ISO 5593:2023(E)
Contents Page
Foreword .iv
Introduction .v
1 S c op e . 1
2 Nor m at i ve r ef er enc e s . 1
3 Terms and definitions . 1
3.1 Mechanical bearings . 1
3.1.1 Rolling bearings . 1
3.1.2 R adial bearings . 7
3.1.3 Thrust bearings . 9
3.1.4 Ball bearings . 10
3.1.5 Roller bearings .15
3.2 B earing parts . 18
3.2.1 G eneral . 18
3.2.2 F eatures of bearing parts . 21
3.2.3 B earing rings . 23
3.2.4 B earing washers .26
3 . 2 . 5 R ol l i n g element s .28
3.2.6 Cages . 31
3.3 B earing arrangements and subunits . 33
3.3.1 Bearing arrangements . 33
3 . 3 . 2 Subu n it s .34
3.3.3 Rolling element and cage assemblies . 35
3.4 D imensions and feature identifications . 36
3.4.1 D imension plans, series and other feature identifications .36
3.4.2 Planes . 37
3.4.3 Boundary dimensions .38
3.4.4 Dimensions of subunits and parts .40
3.5 D imensions associated with tolerances . 43
3.5.1 Widths of inner and outer rings . 43
3 . 5 . 2 R ol ler d i men s ion s . 43
3.5.3 Internal clearance .44
3.6 T orque, loads and life .44
3.6.1 Torque .44
3.6.2 Actual loads . .44
3.6.3 Equivalent loads .46
3.6.4 Life .46
3.6.5 C alculation factors .46
3.7 Miscellaneous . 47
3.7.1 Housings and bearing units . 47
3.7.2 Location and securing .49
Bibliography . 100
Index . 101
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ISO 5593:2023(E)
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 4, Rolling bearings.
This fourth edition cancels and replaces the third edition (ISO 5593:2019), which has been technically
revised.
The main changes compared to the previous edition are as follows: some definitions, figures and notes
have been modified.
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.
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ISO 5593:2023(E)
Introduction
0.1 General
This document provides a list of terms and associated descriptions that are commonly applied in the
field of rolling bearings and their technology. The document contains a list of terms which have found
general acceptance and a common usage.
This document also includes terms which are precisely defined in other rolling bearing standards in the
rolling bearing industry.
ISO/TC 4 standards associated with GPS published after this document can contain additional terms
and definitions.
0.2 Organization of the vocabulary
This document contains:
— terms, with their definition, in mixed order and grouped by topic;
— figures with index numbers of relevant terms;
— alphabetical listings of the terms, with their index numbers.
0.3 Organization of the figures
The figures are principally arranged in the same order as the terms they illustrate.
Each figure gives the index numbers of relevant terms. A figure usually shows only one example of
several existing forms of a bearing or part. In most cases, the figures are simplified and leave out
unnecessary details.
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INTERNATIONAL STANDARD ISO 5593:2023(E)
Rolling bearings — Vocabulary
1 S cope
This document defines terms applied in the field of rolling bearings and their technology.
This document includes terms related to all types of rolling bearings wherein the principal degree of
freedom is continuous rotation around an axis enabled by an ordered set of rolling elements between
two circular raceways such that loads can be transmitted between them in a particular range of either
radial or axial directions, or both. This document also includes accessories to these products.
The following types of terms are not included:
— terms specified in ISO 76, ISO 281 and ISO 1132-1;
— terms which are narrowly applied in only one specialized rolling bearing International Standard.
2 Normat ive references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1 Mechanical bearings
3.1.1 Rolling bearings
3.1.1.1
bearing
mechanical component by means of which a moving part in relative motion is supported and/or guided
with respect to other parts of a mechanism
3.1.1.2
rolling bearing
bearing operating with rolling (rather than sliding) motion between the parts supporting load and
moving in relation to each other
Note 1 to entry: See Figures 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27,
28, 29, 30, 31, 32 and 33.
Note 2 to entry: It comprises raceway members and rolling elements with or without means for either their
spacing or guiding, or both.
Note 3 to entry: It may be designed to support radial load, axial load or combined radial and axial load.
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ISO 5593:2023(E)
3.1.1.3
single-row bearing
single-row rolling bearing
rolling bearing with one row of rolling elements
Note 1 to entry: See Figures 1, 2, 3, 4, 6, 8, 9, 10, 11, 12, 13, 14, 15, 17, 21, 22, 23, 24, 27, 28, 29, 30, 31 and 158.
3.1.1.4
double-row bearing
double-row rolling bearing
rolling bearing with two rows of rolling elements
Note 1 to entry: See Figures 5, 7, 16, 20, 25 and 26.
3.1.1.5
multi-row bearing
multi-row rolling bearing
rolling bearing with more than two rows of rolling elements
Note 1 to entry: See Figure 19.
Note 2 to entry: It is preferable to specify the number of rows and type of bearing, for example, “four-row (radial)
cylindrical roller bearing”.
3.1.1.6
insert bearing
insert ball bearing
radial ball bearing with a spherical outside surface and an extended inner ring with a locking device
Note 1 to entry: See Figure 8.
Note 2 to entry: It is technically possible to have insert bearings with rollers as rolling elements. Such bearings
are however so rare that, for practical use in the bearing industry, the terms “insert bearing” and “insert ball
bearing” are considered to be synonymous.
3.1.1.7
full complement bearing
full complement rolling bearing
rolling bearing in which the sum of the clearances between the rolling elements in each row is less than
the diameter of the rolling elements
Note 1 to entry: See Figures 14, 22, 23 and 157.
Note 2 to entry: Full complement bearings are without a cage or separators usually.
Note 3 to entry: The sum of the clearances between the rolling elements in each row is small enough to give
satisfactory function of the bearing.
3.1.1.8
angular contact bearing
angular contact rolling bearing
rolling bearing designed to support a combination of radial and axial loads
Note 1 to entry: See Figures 4, 5, 7, 9, 10, 12, 16, 17, 20, 21, 27, 29 and 31.
3.1.1.9
rigid bearing
rigid rolling bearing
rolling bearing which resists angular misalignment between the axes of its raceways
Note 1 to entry: See Figures 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 17, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29 and 30.
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ISO 5593:2023(E)
3.1.1.10
self-aligning bearing
self-aligning rolling bearing
rolling bearing which can accommodate angular misalignment and angular motion between the axes of
its rings or washers due to one raceway being spherical
Note 1 to entry: See Figures 7, 15, 16, 31 and 158.
3.1.1.11
external-aligning bearing
external-aligning rolling bearing
rolling bearing which can accommodate angular misalignment between its axis and the axis of its
housing by means of a spherical form on one ring or washer surface, which mates with a complementary
seat surface in an aligning housing ring, in an aligning seat washer or in the housing
Note 1 to entry: See Figures 8, 58 and 120.
3.1.1.12
separable bearing
separable rolling bearing
rolling bearing with separable bearing ring or other subunits
Note 1 to entry: See Figures 6, 9, 10, 11, 12, 13, 14, 19, 21, 24, 25, 26, 28, 29, 30, 31, 35, 36, 39, 40 and 41.
3.1.1.13
non-separable bearing
non-separable rolling bearing
rolling bearing from which, after final manufacturing assembly, neither of its bearing ring can be freely
separated
Note 1 to entry: See Figures 1, 2, 3, 4, 5, 7, 8, 15, 16, 17, 20, 22, 23 and 27.
3.1.1.14
split bearing
split rolling bearing
rolling bearing with rings and the cage, when used, divided into two semi-circular pieces to facilitate
mounting
Note 1 to entry: See Figure 18.
3.1.1.15
metric bearing
metric rolling bearing
rolling bearing designed with boundary dimensions and tolerances in metric units
3.1.1.16
metric series bearing
metric series rolling bearing
metric rolling bearing which conforms to the ISO dimension plan
3.1.1.17
inch bearing
inch rolling bearing
rolling bearing designed with boundary dimensions and tolerances in inches
3.1.1.18
inch series bearing
inch series rolling bearing
inch rolling bearing which conforms to an inch dimension plan
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ISO 5593:2023(E)
3.1.1.19
open bearing
open rolling bearing
rolling bearing with neither seals nor shields
Note 1 to entry: See Figures 1, 4, 5, 6, 7, 9, 10, 11, 12, 13, 15, 16, 17, 18, 19, 21, 24, 25, 26, 27, 28, 29, 30 and 31.
3.1.1.20
sealed bearing
sealed rolling bearing
rolling bearing which is fitted with a seal on one or both sides
Note 1 to entry: See Figures 2, 8 and 20.
3.1.1.21
shielded bearing
shielded rolling bearing
rolling bearing which is fitted with a shield on one or both sides
Note 1 to entry: See Figure 3.
3.1.1.22
capped bearing
capped rolling bearing
rolling bearing which is fitted with one or two seals, one or two shields or with one seal and one shield
Note 1 to entry: See Figures 2, 3, 8 and 20.
3.1.1.23
pre-lubricated bearing
pre-lubricated rolling bearing
rolling bearing which has been charged with lubricant by the manufacturer
3.1.1.24
airframe bearing
airframe rolling bearing
rolling bearing which, by reason of design or execution, is intended for use in the general structure of
an aircraft, including its control systems
3.1.1.25
instrument precision bearing
instrument precision rolling bearing
rolling bearing which, by reason of design or execution, is intended for use in instruments
3.1.1.26
railway axlebox bearing
railway axlebox rolling bearing
rolling bearing which, by reason of design or execution, is intended for use in railway axleboxes
Note 1 to entry: See Figure 20.
3.1.1.27
matched bearing
matched rolling bearing
rolling bearing in a matched pair or a matched stack
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ISO 5593:2023(E)
3.1.1.28
coated bearing
coated rolling bearing
rolling bearing with one or more bearing rings or bearing washers and/or the rolling elements fully or
partly covered (coated) by means of a specifically defined surface coating method
Note 1 to entry: See Figures 114 and 115.
Note 2 to entry: The coating may also be applied to additional integral bearing parts such as cages and shields
but, if only the additional integral bearing parts are coated, the term “coated bearing” should not be used.
3.1.1.29
insulated bearing
insulated rolling bearing
rolling bearing which prevents the passage of electric current and/or the equalization of different
voltage potentials in a given insulation class
Note 1 to entry: See Figures 114, 115, 116 and 117.
Note 2 to entry: Commonly, either the bearing outside surface, faces and chamfers of the outer ring or the bearing
bore, faces and chamfers of the inner ring are provided with an insulating layer of, for example, oxide ceramics or
polymer resins.
Note 3 to entry: The insulation can, alternatively, be provided by means of the rolling elements if they are all
made of a non-conductive material, for example as in some types of hybrid bearings.
3.1.1.30
hybrid bearing
hybrid rolling bearing
rolling bearing in which the rolling elements are made of ceramic material and at least one bearing ring
or bearing washer is made of bearing steel
Note 1 to entry: See Figure 116.
Note 2 to entry: Hybrid bearings for some special applications have a limited number of their rolling elements
made of ceramic material with the remainder being made of bearing steel.
3.1.1.31
ceramic bearing
ceramic rolling bearing
rolling bearing in which the bearing rings/washers and the rolling elements are made of ceramic
material
Note 1 to entry: See Figure 117.
3.1.1.32
sensor bearing
sensor rolling bearing
sensorized bearing
sensorized rolling bearing
rolling bearing with one or more integrated sensors which consist of either electromechanical or
electronic, or both type of components
Note 1 to entry: See Figure 118.
Note 2 to entry: Temperature, speed, displacement, vibration and forces are typical items that can be monitored.
Note 3 to entry: Signal transfer to evaluation equipment is generally via cable, but can be by wireless connection.
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ISO 5593:2023(E)
3.1.1.33
heat stabilized bearing
heat stabilized rolling bearing
rolling bearing able to withstand specified exposure temperatures and maintain dimensional stability
Note 1 to entry: Achieved by tempering components.
3.1.1.34
combined bearing
combined rolling bearing
rolling bearing which has two sets of rolling elements in a bearing individually supporting radial load
and axial load respectively
Note 1 to entry: See Figure 119.
3.1.1.35
duplex bearing
duplex rolling bearing
stack of two rolling bearings selected or manufactured to have predetermined characteristics when
mounted together
Note 1 to entry: See Figures 77, 78 and 79.
3.1.1.36
face-to-face duplex bearing
face-to-face duplex rolling bearing
duplex bearing matched in X-arrangement
stack of two matched bearings mounted with the front faces of their outer rings in contact with each
other
Note 1 to entry: See Figure 78.
Note 2 to entry: See 3.3.1.4.
3.1.1.37
tandem duplex bearing
tandem duplex rolling bearing
stack of two matched bearings mounted with the back face of the outer ring of one bearing in contact
with the front face of the outer ring of the next bearing
Note 1 to entry: See Figure 79.
Note 2 to entry: See 3.3.1.5.
3.1.1.38
back-to-back duplex bearing
back-to-back duplex rolling bearing
duplex bearing matched in O-arrangement
stack of two matched bearings mounted with the back faces of their outer rings in contact with each
other
Note 1 to entry: See Figure 77.
Note 2 to entry: See 3.3.1.3.
3.1.1.39
bearing with interchangeable subunit
rolling bearing with interchangeable subunit
rolling bearing designed and manufactured so that its function is kept properly when any subunit from
the same group of separable (rolling) bearings is assembled with it
Note 1 to entry: Refer to interchangeable subunit (3.3.2.2).
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ISO 5593:2023(E)
3.1.1.40
bearing with non-interchangeable subunit
rolling bearing with non-interchangeable subunit
rolling bearing having a subunit with which it is uniquely paired and not designed and manufactured
to keep its function when assembled with a subunit from any other of the same group of the separable
rolling bearings
Note 1 to entry: Refer to non-interchangeable subunit (3.3.2.3).
3.1.2 Radial bearings
3.1.2.1
radial bearing
radial rolling bearing
rolling bearing designed to support primarily radial load
Note 1 to entry: See Figures 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22 and 23.
Note 2 to entry: Some radial rolling bearings are designed to support a pure radial or axial load as well as a
combination of radial and axial loads.
Note 3 to entry: Its principal parts are inner ring, outer ring and rolling elements with or without a cage.
3.1.2.2
radial contact bearing
radial contact rolling bearing
rolling bearing designed to support primarily a radial load, having a nominal contact angle of 0°
Note 1 to entry: See Figures 1, 2, 3, 8, 11, 13, 14, 15, 18, 19, 22 and 23.
3.1.2.3
angular contact radial bearing
angular contact radial rolling bearing
rolling bearing designed to support primarily a combined radial and axial load
Note 1 to entry: See Figures 4, 5, 7, 9, 10, 12, 16, 17, 20 and 21.
3.1.2.4
tapered bore bearing
tapered bore rolling bearing
radial rolling bearing having an inner ring with tapered bore
Note 1 to entry: See Figures 7 and 19.
3.1.2.5
flanged bearing
flanged rolling bearing
radial rolling bearing with an external radial flange on one of its rings, usually the outer ring
Note 1 to entry: See Figure 21.
3.1.2.6
track roller
track roller rolling bearing
radial rolling bearing with a heavy section outer ring, intended for use as a roller to roll on a track
Note 1 to entry: See Figures 22 and 23.
Note 2 to entry: It is intended for use as a roller to roll on a cam track.
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ISO 5593:2023(E)
3.1.2.7
yoke-type track roller
yoke-type track roller rolling bearing
track roller rolling bearing intended for mounting in a yoke
Note 1 to entry: See Figure 22.
3.1.2.8
stud-type track roller
stud-type track roller rolling bearing
track roller rolling bearing in which the inner member is extended on one side in the form of a shaft for
cantilever mounting of the bearing
Note 1 to entry: See Figure 23.
3.1.2.9
universal matching bearing
universal matching rolling bearing
radial rolling bearing which, when used together with one or more similar bearing(s), selected at
random, yields predetermined characteristics in
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