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Approximate Coefficients of Friction |
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Approximate Coefficients of Sliding Friction
(aka kinematic coefficients of friction  ) |
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Dry |
Lubricated |
| Hard steel |
on hard steel |
0.45 |
0.08 |
| Hard steel |
on babbitt |
0.35 |
0.15 |
| Mild steel |
on mild steel |
0.60 |
0.12 |
| Mild steel |
on bronze |
0.34 |
0.17 |
| Mild steel |
on brass |
0.44 |
- |
| Mild steel |
on copper lead |
0.36 |
0.15 |
| Mild steel |
on cast iron |
0.23 |
0.13 |
| Mild steel |
on lead |
0.95 |
0.30 |
| Mild steel |
on aluminum |
0.50 |
- |
| Mild steel |
on laminated plastic |
0.35 |
0.05 |
| Mild steel |
on teflon |
|
0.04 |
| Cast iron |
on cast iron |
0.15 |
0.07 |
| Cast iron |
on bronze |
0.22 |
0.07 |
| Cast iron |
on brass |
0.30 |
- |
| Cast iron |
on copper |
0.29 |
- |
| Cast iron |
on zinc |
0.21 |
- |
| Aluminum |
on aluminum |
1.40 |
- |
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