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