ISO 20054

Plain bearings — Bearings containing dispersed solid lubricants

ISO 20054:2016 specifies a bearing containing dispersed solid lubricants which is used as a solid lubricant bearing.

Paliers lisses — Paliers contenant des lubrifiants solides dispersés

General Information

• Status: Not Published
• ICS: 21.100.10 - Plain bearings
• Technical Committee: ISO/TC 123/SC 7 - Special types of plain bearings
• Drafting Committee: ISO/TC 123/SC 7 - Special types of plain bearings
• Current Stage: 6000 - International Standard under publication
• Start Date: 13-May-2022
• Completion Date: 13-May-2022

RELATIONS

• Replaces: ISO 20054:2016 - Plain bearings — Bearings containing dispersed solid lubricants
• Effective Date: 06-Jun-2022

Standards Content (sample)

ISO/FDIS 20054:####(X:2022(E)
ISO TC 123/SC 7
Date: YYYY-MM-DD
Plain bearings — Bearings containing dispersed solid lubricants
FDIS stage
Warning for WDs and CDs

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 manuscript of a draft International Standard (known as “The Rice Model”) is available at

© ISO #### – All rights reserved
---------------------- Page: 1 ----------------------
© ISO 20XX
Paliers lisses — Paliers contenant des lubrifiants solides dispersés
Second edition
Date: 2022-03-01
---------------------- Page: 2 ----------------------
ISO/FDIS 20054:2022(E)
© ISO 2022

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: [phone]
Email: [e-mail]
Website: www.iso.orgwww.iso.org
Published in Switzerland
iv © ISO 2022 – All rights reserved
---------------------- Page: 3 ----------------------
ISO/FDIS 20054:2022(E)
Contents

Foreword ............................................................................................................................................................ iv

1 Scope ....................................................................................................................................................... 1

2 Normative references ....................................................................................................................... 1

3 Terms and definitions ....................................................................................................................... 1

4 Symbols and units .............................................................................................................................. 1

5 Characteristics ..................................................................................................................................... 1

5.1 Structure ............................................................................................................................................... 1

5.2 Lubricating mechanism .................................................................................................................... 2

5.3 Applicable field ................................................................................................................................... 3

6 Material ................................................................................................................................................. 3

6.1 Metal matrix ......................................................................................................................................... 3

6.2 Solid lubricant ..................................................................................................................................... 4

6.3 Combination of metal matrix and solid lubricant .................................................................... 5

7 Dimension ............................................................................................................................................. 5

7.1 General ................................................................................................................................................... 5

7.2 General dimension ............................................................................................................................. 6

7.2.1 Seamless bush ...................................................................................................................................... 6

7.2.2 Wrapped bush ..................................................................................................................................... 7

7.3 Tolerance classes and limit deviations ....................................................................................... 7

7.3.1 General ................................................................................................................................................... 7

7.3.2 Bearing fit ............................................................................................................................................. 7

7.3.3 Bearing clearance ............................................................................................................................... 7

8 Assembling ........................................................................................................................................... 8

9 Surface finish ....................................................................................................................................... 8

Annex A (informative) Guidance for selection of a bearing metal matrix for bearings

containing dispersed solid lubricants ......................................................................................... 9

Annex B (informative) Actual applications of a bearing containing dispersed solid

lubricants ........................................................................................................................................... 10

Bibliography ................................................................................................................................................... 11

© ISO 2022 – All rights reserved v
---------------------- Page: 4 ----------------------
ISO/FDIS 20054:2022(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 123, Plain bearings, Subcommittee SC 7,

Special types of plain bearings.

This second edition cancels and replaces the first edition (ISO 20054:2016), of which it constitutes a

minor revision.
The main changes are as follows:

— the titles of 5.2, 7.3.2 and 7.3.3 were changed to more suitable ones. In addition, changes in the

description in 7.1 due to those changes were conducted.

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.
vi © ISO 2022 – All rights reserved
---------------------- Page: 5 ----------------------
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 20054:2022(E)
Plain bearings — Bearings containing dispersed solid lubricants
1 Scope

This document specifies the characteristics, materials, dimensions, assembly and surface finish for a

bearing containing dispersed solid lubricants which is used as a solid lubricant bearing.

NOTE In the solid lubricant bearing among self-lubricating bearings there is a solid type, a coated type, an

embedded type and a dispersed type, which is specified by this document.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 3547-1, Plain bearings — Wrapped bushes — Part 1: Dimensions
There are no normative references in this document.
3 Terms and definitions
No terms and definitions are listed in this document.

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/
4 Symbols and units
See Table 1.
Table 1 — Symbols and units
Symbol Description Unit
B Width of the bush mm
Di Inside diameter of the bush mm
D Outside diameter of the bush mm
x Surface roughness
© ISO 2022 – All rights reserved 1
---------------------- Page: 6 ----------------------
ISO/FDIS 20054:2022(E)
5 Characteristics
5.1 Structure

A bearing containing dispersed solid lubricants is made of sintered composite materials that contain solid

lubricants dispersed uniformly in the metal matrix and is manufactured by powder metallurgy (see

Figure 1).

This document includes multi-layered bearings with the sintered layer on a steel backing and both

seamless and wrapped bushes (see Figure 2).

Figure 3 shows a typical microstructure of the bearings containing dispersed solid lubricants. The

dispersed solid lubricants in the metal matrix vary in grain size and volume.
b) Seamless bush
a) Seamless bush
(coarse solid lubricants type)
(fine solid lubricants type)
a) Seamless bush — Fine solid lubricants type b) Seamless bush — Coarse solid
lubricants type

Figure 1 — — Overview of bearings containing dispersed solid lubricants (that are single-

layered)
a) Seamless bush
b) Wrapped bush
2 © ISO 2022 – All rights reserved
---------------------- Page: 7 ----------------------
ISO/FDIS 20054:2022(E)
a) Seamless bush b) Wrapped bush
Key
1 sintered layer
2 steel backing

Figure 2 — — Overview of bearings containing dispersed solid lubricants (that are multi-

layered)
a) Fine solid lubricants type
b) Coarse solid lubricants type
a) Fine solid lubricants type b) Coarse solid lubricants type
Key
1 metal matrix
2 dispersed solid lubricant
Figure 3 — — Microstructure of a bearing containing dispersed solid lubricants
© ISO 2022 – All rights reserved 3
---------------------- Page: 8 ----------------------
ISO/FDIS 20054:2022(E)
5.2 Lubricating mechanism

A bearing containing dispersed solid lubricants obtains its sliding performance from the self-lubricating

effects of solid lubricants and the mechanical strength of metal matrix.

The sliding performance and mechanical strength vary according to the volume of solid lubricants. Higher

sliding performance requires more solid lubricants, while higher mechanical strength requires less solid

lubricants.

Since solid lubricants are dispersed over the entire material, the bearings are particularly suitable for

extra low speed or micro-motion applications, minimising static friction to achieve smooth sliding at the

start of motion.

The solid lubricants are drawn out over both surfaces from the bearing material when it slides against

the mating surface, forming a solid lubricant film. As the solid lubricant film is consumed, it is replenished

from the bearing material to maintain a continuous film throughout the life of the product (see Figure 4).

Key
1 mating member
2 metal matrix
1 mating member 3 dispersed solid lubricant
Inserted Cells
2 metal matrix 4 solid lubricant film
Inserted Cells
Sliding direction.
Inserted Cells

Figure 4 — — Lubricating mechanism of a bearing containing dispersed solid lubricants

Inserted Cells
5.3 Applicable field

The bearing can be used for rotational motion, reciprocating motion, oscillating motion and frequent

start/stop cycles. The bearing is a
...

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 20054
ISO/TC 123/SC 7
Plain bearings — Bearings containing
Secretariat: JISC
dispersed solid lubricants
Voting begins on:
2022-03-17
Paliers lisses — Paliers contenant des lubrifiants solides dispersés
Voting terminates on:
2022-05-12
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.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 20054:2022(E)
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. © ISO 2022
---------------------- Page: 1 ----------------------
ISO/FDIS 20054:2022(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2022

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: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
© ISO 2022 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/FDIS 20054:2022(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ..................................................................................................................................................................................... 1

3 Terms and definitions .................................................................................................................................................................................... 1

4 Symbols and units............................................................................................................................................................................................... 1

5 Characteristics ....................................................................................................................................................................................................... 1

5.1 Structure ...................................................................................................................................................................................................... 1

5.2 Lubricating mechanism .................................................................................................................................................................. 3

5.3 Applicable field ....................................................................................................................................................................................... 3

6 Material.......................................................................................................................................................................................................................... 3

6.1 Metal matrix ............................................................................................................................................................................................. 3

6.2 Solid lubricant ......................................................................................................................................................................................... 4

6.3 Combination of metal matrix and solid lubricant.................................................................................................... 4

7 Dimension ................................................................................................................................................................................................................... 5

7.1 General ........................................................................................................................................................................................................... 5

7.2 General dimension .............................................................................................................................................................................. 5

7.2.1 Seamless bush ....................................................................................................................................................................... 5

7.2.2 Wrapped bush ....................................................................................................................................................................... 7

7.3 Tolerance classes and limit deviations .............................................................................................................................. 7

7.3.1 General ........................................................................................................................................................................................ 7

7.3.2 Bearing fit ................................................................................................................................................................................. 7

7.3.3 Bearing clearance .............................................................................................................................................................. 7

8 Assembling ................................................................................................................................................................................................................. 8

9 Surface finish ...........................................................................................................................................................................................................8

Annex A (informative) Guidance for selection of a bearing metal matrix for bearings

containing dispersed solid lubricants .......................................................................................................................................... 9

Annex B (informative) Actual applications of a bearing containing dispersed solid

lubricants ..................................................................................................................................................................................................................10

Bibliography .............................................................................................................................................................................................................................11

iii
© ISO 2022 – All rights reserved
---------------------- Page: 3 ----------------------
ISO/FDIS 20054:2022(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 123, Plain bearings, Subcommittee SC 7,

Special types of plain bearings.

This second edition cancels and replaces the first edition (ISO 20054:2016), of which it constitutes a

minor revision.

The main changes are as follows: the titles of 5.2, 7.3.2 and 7.3.3 were changed to more suitable ones. In

addition, changes in the description in 7.1 due to those changes were conducted.

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.
© ISO 2022 – All rights reserved
---------------------- Page: 4 ----------------------
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 20054:2022(E)
Plain bearings — Bearings containing dispersed solid
lubricants
1 Scope

This document specifies the characteristics, materials, dimensions, assembly and surface finish for a

bearing containing dispersed solid lubricants which is used as a solid lubricant bearing.

NOTE In the solid lubricant bearing among self-lubricating bearings there is a solid type, a coated type, an

embedded type and a dispersed type, which is specified by this document.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
No terms and definitions are listed in this document.

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/
4 Symbols and units
See Table 1.
Table 1 — Symbols and units
Symbol Description Unit
B Width of the bush mm
D Inside diameter of the bush mm
D Outside diameter of the bush mm
x Surface roughness —
5 Characteristics
5.1 Structure

A bearing containing dispersed solid lubricants is made of sintered composite materials that contain

solid lubricants dispersed uniformly in the metal matrix and is manufactured by powder metallurgy

(see Figure 1).

This document includes multi-layered bearings with the sintered layer on a steel backing and both

seamless and wrapped bushes (see Figure 2).

Figure 3 shows a typical microstructure of the bearings containing dispersed solid lubricants. The

dispersed solid lubricants in the metal matrix vary in grain size and volume.
© ISO 2022 – All rights reserved
---------------------- Page: 5 ----------------------
ISO/FDIS 20054:2022(E)

a) Seamless bush — Fine solid lubricants type b) Seamless bush — Coarse solid lubricants

type

Figure 1 — Overview of bearings containing dispersed solid lubricants that are single-layered

a) Seamless bush b) Wrapped bush
Key
1 sintered layer
2 steel backing

Figure 2 — Overview of bearings containing dispersed solid lubricants that are multi-layered

a) Fine solid lubricants type b) Coarse solid lubricants type
Key
1 metal matrix
2 dispersed solid lubricant
Figure 3 — Microstructure of a bearing containing dispersed solid lubricants
© ISO 2022 – All rights reserved
---------------------- Page: 6 ----------------------
ISO/FDIS 20054:2022(E)
5.2 Lubricating mechanism

A bearing containing dispersed solid lubricants obtains its sliding performance from the self-lubricating

effects of solid lubricants and the mechanical strength of metal matrix.

The sliding performance and mechanical strength vary according to the volume of solid lubricants.

Higher sliding performance requires more solid lubricants, while higher mechanical strength requires

less solid lubricants.

Since solid lubricants are dispersed over the entire material, the bearings are particularly suitable for

extra low speed or micro-motion applications, minimising static friction to achieve smooth sliding at

the start of motion.

The solid lubricants are drawn out over both surfaces from the bearing material when it slides

against the mating surface, forming a solid lubricant film. As the solid lubricant film is consumed, i

...