MECHANICAL
POLISH/RA REFERENCE CHART
| Surface Finish Code |
ASME Surface Designation | Inside Surface | Outside Surface | ||
| Ra (max) | Surface Treatment | Ra (max) | Surface Treatment | ||
| -1 | N/A | Mill Finish | N/A | Mill Finish | |
| -3 | 32 | Mechanical Polish | N/A | Mill Finish | |
| -5 | N/A | Mill Finish | 32 | Mechanical Polish | |
| -7 | 32 | Mechanical Polish | 32 | Mechanical Polish | |
| PC | SFF1 | 20 | Mechanical Polish | N/A | Mill Finish |
| PL | SFF1 | 20 | Mechanical Polish | 32 | Mechanical Polish |
| PD | SFF4 | 15 | Mechanical Polish & Electropolish | N/A | Mill Finish |
| PM | SFF4 | 15 | Mechanical Polish & Electropolish | 32 | Mechanical Polish |