ISO 19259:2015

INTERNATIONAL ISO
STANDARD 19259
First edition
2015-10-01
Plain bearings — Bearings with
embedded solid lubricants
Paliers lisses — Paliers avec lubrifiants solide incorporé
Reference number
ISO 19259:2015(E)
©
ISO 2015

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ISO 19259:2015(E)

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© ISO 2015, Published in Switzerland
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ISO 19259:2015(E)

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Characteristics . 1
3.1 Structure . 1
3.2 Friction and wear characteristics . 2
3.3 Applicable field . 3
4 Material . 4
4.1 Metallic base body . 4
4.1.1 Copper alloy castings . 4
4.1.2 Grey cast irons . 4
4.2 Solid lubricant. 5
4.3 Combination of metallic base body and solid lubricant . 5
5 Dimensions . 6
6 Assembling . 9
7 Surface finish . 9
Annex A (informative) Guide for selection of a bearing with embedded solid lubricants .10
Annex B (informative) Actual applications of a bearing with embedded solid lubricants .11
Bibliography .12
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ISO 19259:2015(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
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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).
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For an explanation on the meaning of ISO specific terms and expressions related to conformity
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Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information.
The committee responsible for this document is ISO/TC 123, Plain bearings, Subcommittee SC 7, Special
types of plain bearings.
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INTERNATIONAL STANDARD ISO 19259:2015(E)
Plain bearings — Bearings with embedded solid lubricants
1 Scope
This International Standard specifies a bearing with embedded solid lubricants which has been widely
used as a solid lubricant bearing.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 185, Grey cast irons — Classification
3 Characteristics
3.1 Structure
A bearing with embedded solid lubricants is composed of a metallic base body supporting a load
and a solid lubricant embedded in holes or hollows formed on the surface of the metallic base body
giving lubricity. As to the embedded state of a solid lubricant, there is a plug type and a spiral type
(refer to Figure 1).
As for hole type, there are “through” or perforated ones and “bottomed” ones (refer to Figure 2).
This International Standard specifies a type which is most common and has been widely used where a
solid lubricant of a plug type is embedded in through holes. The International Standard also specifies a
cylindrical bush and a flanged bush (refer to Figure 3).
a) Plug type b) Spiral type
Figure 1 — Embedded state of solid lubricants on cylindrical bush
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ISO 19259:2015(E)

a) Through hole type b) Bottomed hole type
Key
1 metallic base body
2 hole
3 solid lubricant plug
Figure 2 — Structure of cross section on a bearing with embedded solid lubricants
a) Cylindrical bush b) Flanged bush
Figure 3 — Overview of a bearing with embedded solid lubricants (plug type)
3.2 Friction and wear characteristics
A bearing with embedded solid lubricants falls under the category of a solid lubricant bearing among
self-lubricating bearings. In the solid lubricant bearings, there is a solid type, a coated type, a dispersed
type, and an embedded type.
A solid type is such where a solid lubricant powder is solidified using pitch, resin or the like as a binder.
A coated type is such where a solid lubricant film is formed on a sliding surface by chemical or physical
means such as coating, baking, chemical reaction, or the like.
A dispersed type is such where a solid lubricant powder (fine particles) is dispersed into sintered metal
matrix or the like.
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ISO 19259:2015(E)

An embedded type is such as mentioned above where holes or hollows are formed on a sliding surface
of a metallic base body and solid lubricants are embedded therein and, since the load is supported by a
metallic base body, this type has excellent load carrying capacity.
The embedded solid lubricant supplies solid lubricant to the sliding surface and, when it slides on
the mating member, the solid lubricant is properly drawn out and spread over both sliding surfaces
whereupon a solid lubricant film is formed.
Further, even when the film is broken, the embedded solid lubricant is drawn out by friction onto the
sliding surfaces, so it repairs the film on the sliding surfaces whereby the lubrication is made possible
for long periods and long life is achieved (refer to Figure 4).
Since the types of metallic base body and solid lubricant can be appropriately selected depending upon
the operating conditions, a wide range of applications is possible. Moreover, bearings ranging from
small to large sizes can be manufactured.
2
A
4
3 1
Key
1 metallic base body
2 mating member
3 embedded solid lubricant
4 solid lubricant film
A sliding direction
Figure 4 — Lubricating mechanism of a bearing with embedded solid lubricants
3.3 Applicable field
The bearing can be used for rotational motion, reciprocating motion, oscillating motion, and frequent
start/stop cycles. The bearing is also used in such applications where no fluid lubrication can be expected
because of high load and low speed operation, and where the environment temperature is high.
Principally, the bearing can be used without supplying oil or grease. However, depending upon the
actual operating conditions, oil or grease may be supplied for a purpose of enhancement of durability,
removal of wear particulate or dust, and prevention of corrosion of the mating member.
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ISO 19259:2015(E)

4 Material
4.1 Metallic base body
Principal materia
...