| Materials and Material Combinations |
Coefficient of Friction | |
| Clean | Lubricated | |
| Steel | 0.74 | 0.16 |
| Copper-lead alloy | 0.22 | - |
| Phosphor-bronze | 0.35 | - |
| Aluminum-bronze | 0.45 | - |
| Brass | 0.35 | 0.19 |
| Cast iron | 0.4 | 0.21 |
| Bronze | - | 0.16 |
| Sintered bronze | - | 0.13 |
| Hard carbon | 0.14 | 0.11-0.14 |
| Graphite | 0.1 | 0.1 |
| Tungsten carbide | 0.4-0.6 | 0.1-0.2 |
| Plexiglas | 0.4-0.5 | 0.4-0.5 |
| Polystyrene | 0.3-0.35 | 0.3-0.35 |
| Polythene | 0.2 | 0.2 |
| Teflon | 0.04 | 0.04 |
| Aluminum-aluminum | 1.35 | 0.3 |
| Cadmium-cadmium | 0.5 | 0.05 |
| Chromium-chromium | 0.41 | 0.34 |
| Copper-copper | 1 | 0.08 |
| Iron-iron | 1 | 0.15-0.20 |
| Magnesium-magnesium | 0.6 | 0.08 |
| Nickel-nickel | 0.7 | 0.28 |
| Platinum-platinum | 1.2 | 0.25 |
| Silver-silver | 1.4 | 0.55 |
| Zinc-zinc | 0.6 | 0.04 |
| Glass-glass | 0.9-1.0 | 0.1-0.6 |
| Glass-metal | 0.5-0.7 | 0.2-0.3 |
| Diamond-diamond | 0.1 | 0.05-0.1 |
| Diamond-metal | 0.1-0.15 | 0.1 |
| Sapphire-sapphire | 0.2 | 0.2 |
| Hard carbon on carbon | 0.16 | 0.12-0.14 |
| Graphite-graphite (in vacuum) | 0.5-0.8 | - |
| Graphite-graphite | 0.1 | 0.1 |
| Tungsten carbide-tungsten carbide | 0.2-0.25 | 0.12 |
| Plexiglas-plexiglas | 0.8 | 0.8 |
| Polystyrene-polystyrene | 0.5 | 0.5 |
| Teflon-Teflon | 0.04 | 0.04 |
| Nylon-nylon | 0.15-0.25 | - |
| Solids on rubber | 1-4 | - |
| Wood on wood (clean) | 0.25-0.5 | - |
| Wood on wood (wet) | 0.2 | - |
| Wood on metals (clean) | 0.2-0.6 | - |
| Wood on metals (wet) | 0.2 | - |
| Brick on wood | 0.6 | - |
| Leather on wood | 0.3-0.4 | - |
| Leather on metal (clean) | 0.6 | - |
| Leather on metal (wet) | 0.4 | - |
| Leather on metal (greasy) | 0.2 | - |
| Brake material on cast iron | 0.4 | - |
| Brake material on cast iron (wet) | 0.2 | - |