Values of surface roughness for various materials:
|
Material |
Surface Roughness k, inch |
| Drawn tubing | 0.00006 |
| Commercial steel | 0.0018 |
| Galvanized iron | 0.006 |
| Cast iron | 0.010 |
| Wood stave | 0.0072 - 0.036 |
| Concrete | 0.012 - 0.12 |
| Riveted steel | 0.036 - 0.36 |