Coefficient of Friction Reference Chart

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Materials and their combinations Surface Conditions Static Coefficient of Friction
Aluminum Aluminum Clean and Dry 1.05 – 1.35
Aluminum Aluminum Lubricated and Greasy 0.3
Aluminum-bronze Steel Clean and Dry 0.45
Aluminum Mild Steel Clean and Dry 0.61
Brass Steel Clean and Dry 0.51
Brass Steel Lubricated and Greasy 0.19
Brass Steel Castor oil 0.11
Brick Wood Clean and Dry 0.6
Bronze Steel Lubricated and Greasy 0.16
Bronze – sintered Steel Lubricated and Greasy 0.13
Cadmium Cadmium Clean and Dry 0.5
Cadmium Cadmium Lubricated and Greasy 0.05
Cadmium Chromium Clean and Dry 0.41
Cadmium Chromium Lubricated and Greasy 0.34
Cast Iron Cast Iron Clean and Dry 1.1
Cast iron Mild Steel Clean and Dry 0.4
Cast iron Mild Steel Lubricated and Greasy 0.21
Carbon (hard) Carbon Clean and Dry 0.16
Carbon (hard) Carbon Lubricated and Greasy 0.12 – 0.14
Carbon Steel Clean and Dry 0.14
Carbon Steel Lubricated and Greasy 0.11 – 0.14
Chromium Chromium Clean and Dry 0.41
Chromium Chromium Lubricated and Greasy 0.34
Copper-Lead alloy Steel Clean and Dry 0.22
Copper Copper Clean and Dry 1.6
Copper Copper Lubricated and Greasy 0.08
Copper Cast Iron Clean and Dry 1.05
Copper Mild Steel Clean and Dry 0.53
Copper Glass Clean and Dry 0.68
Glass Metal Clean and Dry 0.5 – 0.7
Glass Metal Lubricated and Greasy 0.2 – 0.3
Glass Nickel Clean and Dry 0.78
Glass Nickel Lubricated and Greasy 0.56
Graphite Steel Clean and Dry 0.1
Graphite Steel Lubricated and Greasy 0.1
Graphite Graphite Clean and Dry 0.1
Graphite Graphite Lubricated and Greasy 0.1
Iron Iron Clean and Dry 1
Iron Iron Lubricated and Greasy 0.15 – 0.20
Leather Metal Clean and Dry 0.4
Leather Metal Lubricated and Greasy 0.2
Leather Clean Metal Clean and Dry 0.6
Leather Cast Iron Clean and Dry 0.6
Leather fiber  Cast iron Clean and Dry 0.31
Leather fiber Aluminum Clean and Dry 0.3
Magnesium Magnesium Clean and Dry 0.6
Magnesium Magnesium Lubricated and Greasy 0.08
Nickel Nickel Clean and Dry 0.7 – 1.1
Nickel Nickel Lubricated and Greasy 0.28
Nylon Steel Clean and Dry 0.4
Paper Cast Iron Clean and Dry 0.2
Plexiglas Steel Clean and Dry 0.4 – 0.5
Plexiglas Steel Lubricated and Greasy 0.4 – 0.5
Polystyrene Steel Clean and Dry 0.3 – 0.35
Polystyrene Steel Lubricated and Greasy 0.3 – 0.35
Polyethylene Polytehylene Clean and Dry 0.2
Polyethylene Steel Clean and Dry 0.2
Polyethylene Steel Lubricated and Greasy 0.2
Silver Silver Clean and Dry 1.4
Silver Silver Lubricated and Greasy 0.55
Skin Metals Clean and Dry 0.8 – 1.0
Steel Steel Clean and Dry 0.5 – 0.8
Steel Steel Lubricated and Greasy 0.16
Steel Steel Castor oil 0.15
Steel Steel Light mineral oil 0.23
Steel Steel Lard 0.11
Steel Graphite Clean and Dry 0.21
Polytetrafluoroethylene (PTFE) (Teflon) Polytetrafluoroethylene (PTFE) Clean and Dry 0.04
Polytetrafluoroethylene (PTFE) Polytetrafluoroethylene (PTFE) Lubricated and Greasy 0.04
Polytetrafluoroethylene (PTFE) Steel Clean and Dry 0.05 – 0.2
Tungsten Carbide Steel Clean and Dry 0.4 – 0.6
Tungsten Carbide Steel Lubricated and Greasy 0.1 – 0.2
Tungsten Carbide Tungsten Carbide Clean and Dry 0.2 – 0.25
Tungsten Carbide Tungsten Carbide Lubricated and Greasy 0.12
Tungsten Carbide Copper Clean and Dry 0.35
Tungsten Carbide Iron Clean and Dry 0.8
Wood Clean Metal Clean and Dry 0.2 – 0.6
Zinc Cast Iron Clean and Dry 0.85
Zinc Zinc Clean and Dry 0.6
Zinc Zinc Lubricated and Greasy 0.04