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General Information, Facts & Tables
[Frictions of Various Materials]

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Overview

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The table below lists the coefficients of friction for dry and lubricated materials.
 

Friction of Various Materials

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Material 1

Material 2

Clean - Dry

Lubricated

Aluminum

Aluminum

1.35

0.3

Aluminum Bronze

Steel

0.45

-

Brake material

Cast Iron

0.4

-

Brake material

Cast Iron (wet)

0.2

-

Brass

Steel

0.35

0.19

Brick

Wood

0.6

-

Bronze

Steel

-

0.16

Cadmium

Cadmium

0.5

0.05

Cast Iron

Steel

0.4

0.21

Chromium

Chromium

0.41

0.34

Copper

Copper

1

0.08

Copper-Lead Alloy

Steel

0.22

-

Diamond

Diamond

0.1

0.05 - 0.1

Diamond

Metal

0.1 - 0.15

0.1

Glass

Glass

0.9 - 1.0

0.1 - 0.6

Glass

Metal

0.5 - 0.7

0.2 - 0.3

Graphite

Graphite

0.1

0.1

Graphite

Steel

0.1

0.1

Graphite (in vacuum)

Graphite (in vacuum)

0.5 - 0.8

-

Hard Carbon

Hard Carbon

0.16

0.12 - 0.14

Hard Carbon

Steel

0.14

0.11 - 0.14

Iron

Iron

1

0.15 - 0.20

Leather

Wood

0.3 - 0.4

-

Leather

Metal (clean)

0.6

-

Leather

Metal (wet)

0.4

-

Leather

Metal (greasy)

0.2

-

Magnesium

Magnesium

0.6

0.08

Nickel

Nickel

0.7

0.28

Nylon

Nylon

0.15 - 0.25

-

Phosphor Bronze

Steel

0.35

-

Platinum

Platinum

1.2

0.25

Plexiglas

Plexiglas

0.8

0.8

Plexiglas

Steel

0.4 - 0.5

0.4 - 0.5

Polystyrene

Polystyrene

0.5

0.5

Polystyrene

Steel

0.3 - 0.35

0.3 - 0.35

Polythene

Steel

0.2

0.2

Sapphire

Sapphire

0.2

0.2

Silver

Silver

1.4

0.55

Sintered Bronze

Steel

-

0.13

Solids

Rubber

1.0 - 4.0

-

Steel

Steel

0.8

0.16

Teflon

Steel

0.04

0.04

Teflon

Teflon

0.04

0.04

Tungsten Carbide

Steel

0.4 - 0.6

0.1 - 0.2

Tungsten Carbide

Tungsten Carbide

0.2 - 0.25

0.12

Wood

Wood (clean)

0.25 - 0.5

-

Wood

Wood (wet)

0.2

-

Wood

Metals (clean)

0.2 - 0.6

-

Wood

Metals (wet)

0.2

-

Zinc

Zinc

0.6

0.04