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Chapter 2

Typical bearing materialsMany kinds of bearing materials with a variety of the characteristics listed in tables 3-1 and 3-2 have

been developed for individual applications and purposes.

Characteristics of bearing materials

Figure 3-2 shows a comparison of bearing material characteristics. Nine representative materials

were selected and each characteristic evaluated, taking the highest rank to be five points.

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Material Fatigue resistance Wear resistance Anti-seizure Conformability Anti-corrosion1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5

W87S

A20

A40

A21X

A10H

P10/C/A4ZS

P4/N/L17

P8/N/K22

P2H/N/K22

Figure 3-2 Characteristics of bearing materials

Note: ‘C’ and ‘N’ represent ‘Cu’ and ‘Ni’ respectively.Wear resistance with overlay indicates evaluation results for alloy.

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Chapter 2

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DAIDO's product name

Material CharacteristicsMajor chemical components (weight %)

Cu Sn Pb Sb Al Zn Si In Others

Copper alloy L10

K22

L23

A4ZS*

L17

A20

A40

A17X*

A21X*

A10H

BG1K*

Traces 10 10

Traces

Traces

Traces

Traces

1.2

1.0 20

W90 4 Traces

W87 4 Traces

W87S* 4 Traces

Traces

1.0 40 Traces

0.7 12 1.7 0.3 Traces 2.5

0.7 12 1.7 0.3

6

9

9 Cd,Cr

Traces 2.5

1.5 10 Traces 2.5

1 Traces 4 6

11 5

1.5 23

3 23

3 17

Gr,P,Ni

Copper alloy (overlay required)

Aluminum alloy (overlay required)

Aluminum alloy

Tin alloy (white metal)

Overlay

Resin

Used for the thrust metal of the piston pin bush and turbo charger.Material for piston pins subject to high temperature and heavy specific loadsGenerally used for the con'rod bearing and main bearing with a P8/P9 overlay applied. L23 is also used for bushes without an overlay.

Applying a P10 overlay ensures high fatigue strength and excellent anti-corrosion, making it ideal for bearings in diesel engines.

General aluminum material

Excellent anti-seizure and conformability

High fatigue strength

Ensures conformability equivalent to that of A17X and higher fatigue strength.

Pb-free material for high specific load, developed by improving the fatigue strength of A21X

General white metal used in general industries. Stronger than W90.

Reinforced white metal used for bearings in low-speed engines.

General overlay material

Ensures excellent conformability, and improves anti-seizure and wear resistance in high-speed and heavy-load environments.

General overlay materials for copper alloy, with excellent wear resistance

Overlay for high specific load bearings, with excellent fatigue strength

Developed by adding particles to P4 to provide excellent fatigue strength and wear resistance.

Improves conformability and uneven contact between the bearing and shaft in aluminum alloy bearings.

Excellent anti-corrosion and anti-cavitation.

Resin overlay for dry turning of main bearings in low-seed engines.

Employs a sintering layer of copper alloy in the middle layer to attach the backsteel. Ensures high temperature resistance, making it highly suitable for use in boundary environments.

P10

P9

P8 2

P4* 2

P4Z 2

P1*

P2H 3

10

9

10

10

10

100

Traces

Traces

Traces

Traces

Traces

Traces

9

12.5

12.5

DLH2

DTK01

DTK07

Binder + PTFE +

PTFE + CF +

PTFE +

* DAIDO's patented productsNote: Materials listed in this table are the current bimetal materials most widely used in the shipping and general industries.

Please contact us for solid metals, resin and surface modification materials not listed above.

Table 3-1 Typical bearing material list

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