| 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 |
