Coefficient of Friction
800-871-5022
More information can be found at
www.Drill-HQ.com.
Extreme care is needed in using friction coefficients.
Please use additional independent references. For
any specific application the ideal method of
determining the coefficient of friction is by trials. A
short table is included above the main table to
illustrate how the coefficient of friction is affected by
surface films. When a metal surface is perfectly clean
in a vacuum, the friction is much higher than the
normal accepted value and seizure can easily occur.
Effect of Oxide film, Sulfide film
Coefficient of Static Friction
on
Sulfide
Film
0.39
0.74
MATERIAL
Clean & Dry
Steel-Steel
CopperCopper
0.78
Thick Oxide
Film
0.27
1.21
0.76
Coefficient of Friction
Mat. 1
Mat 2.
Aluminum
Aluminum
Brake
Material
Alluminum
Mild Steel
Cast Iron
Dry
Static
1.05-1.35
0.61
0.4
Sliding
1.4
0.47
Greasy
Static
Sliding
0.3
Coefficient of Friction
Coefficient of Friction
800-871-5022
More information can be found at
www.Drill-HQ.com.
Mat. 1
Dry
Mat 2.
Static
Brake
Material
Brass
Brick
Bronze
Bronze
Cadmium
Cadmium
Cast Iron
Cast Iron
Chromium
Copper
Copper
Copper
Copper-Lead
Alloy
Diamond
Diamond
Glass
Glass
Glass
Graphite
Graphite
Graphite (In
vacuum)
Cast Iron
(Wet)
Cast Iron
Wood
Cast Iron
Steel
Cadmium
Mild Steel
Cast Iron
Oak
Chromium
Cast Iron
Copper
Mild Steel
0.41
1.05
1.0
0.53
Steel
0.22
Diamond
Metal
Glass
Metal
Nickel
Graphite
Steel
Graphite (In
vacuum)
Sliding
Greasy
Static
Sliding
0.2
0.3
0.6
0.22
0.16
0.05
0.5
1.1
0.1
0.1-0.15
0.9-1.0
0.5-0.7
0.78
0.1
0.1
0.5-0.8
0.46
0.15
0.49
0.07
0.075
0.34
0.29
0.08
0.36
0.4
0.18
0.05-0.1
0.1
0.1-0.6
0.2-0.3
0.56
0.1
0.1
0.09-0.12
Coefficient of Friction
Coefficient of Friction
800-871-5022
More information can be found at
www.Drill-HQ.com.
Mat. 1
Dry
Mat 2.
Static
Sliding
Greasy
Static
Sliding
Hard Carbon Hard Carbon
0.16
0.12-0.14
Hard Carbon Steel
0.14
0.11-0.14
Iron
Lead
Leather
Iron
Cast Iron
Wood
1.0
Leather
Metal (Clean)
0.6
Leather
Metal (Wet)
0.4
Leather
Oak (Parallel
grain)
0.61
Magnesium
Nickel
Nickel
Nylon
Magnesium
Nickel
Mild Steel
Nylon
Oak
Oak (Parallel
grain)
Oak
Platinum
Plexiglas
Plexiglas
Oak (cross
grain)
Platinum
Plexiglas
Steel
0.15-0.2
0.43
0.3-0.4
0.6
0.7-1.1
0.2
0.52
0.53
0.64
0.08
0.28
0.12
0.178
0.15-0.25
0.62
0.48
0.54
0.32
1.2
0.8
0.4 - 0.5
0.072
0.25
0.8
0.4 - 0.5
Coefficient of Friction
Coefficient of Friction
800-871-5022
More information can be found at
www.Drill-HQ.com.
Dry
Static
Sliding
0.5
0.3-0.35
0.2
Mat. 1
Mat 2.
Polystyrene
Polystyrene
Polythene
Polystyrene
Steel
Steel
Rubber
Asphalt (Dry)
0.5-0.8
Rubber
Asphalt (Wet)
0.250.0.75
Rubber
Rubber
Saphire
Silver
Sintered
Bronze
Solids
Steel
Steel
Steel (Mild)
Steel (Mild)
Steel
Steel
Concrete
(Dry)
Concrete
(Wet)
Saphire
Silver
0.6-0.85
0.45-0.75
0.2
1.4
0.2
0.55
Steel
Rubber
Aluminium
Bros
Brass
Brass
Cast Iron
Cast Iron
Copper Lead
Alloy
Greasy
Static
Sliding
0.5
0.3-0.35
0.2
0.13
1.0-4.0
0.45
0.35
0.51
0.19
0.44
0.23
0.183
0.21
0.133
0.4
0.22
0.16
0.145
Coefficient of Friction
Coefficient of Friction
800-871-5022
More information can be found at
www.Drill-HQ.com.
Mat. 1
Steel (Hard)
Steel
Steel (Mild)
Steel (Mild)
Steel
Steel (Hard)
Steel (Hard)
Steel (Mild)
Steel (Hard)
Steel
Teflon
Teflon
Tin
Tungsten
Carbide
Tungsten
Carbide
Tungsten
Carbide
Tungsten
Carbide
Dry
Mat 2.
Graphite
Graphite
Lead
Phos Bros
Phos Bros
Polythened
Polystyrene
Steel (Mild)
Steel (Hard)
Zinc (Plated
on steel)
Steel
Teflon
Cast Iron
Tungsten
Carbide
Steel
Static
0.21
0.1
0.95
Sliding
0.95
0.34
0.35
0.2
0.3-0.35
0.74
0.78
0.57
0.42
0.5
0.45
Greasy
Static
Sliding
0.09
0.1
0.5
0.3
0.173
0.2
0.3-0.35
0.04
0.04
0.09-0.19
0.05-0.11 0.029-.12
0.04
0.04
.32
0.2-0.25
0.12
0.4-0.6
0.08-0.2
Copper
0.35
Iron
0.8
0.04
0.04
Coefficient of Friction
Coefficient of Friction
800-871-5022
More information can be found at
www.Drill-HQ.com.
Mat. 1
Dry
Mat 2.
Static
Wood
Wood (clean)
0.25-0.5
Wood
Wood (Wet)
0.2
Wood
Metals(Clean)
0.2-0.6
Wood
Wood
Wood
Zinc
Zinc
Metals(Wet)
Brick
Concrete
Zinc
Cast Iron
0.2
0.6
0.62
0.6
0.85
Sliding
Greasy
Static
Sliding
0.04
0.21