MECHANICAL POLISH/RA REFERENCE CHART
Surface Finish
Code
ASME Surface Designation Inside Surface Outside Surface
Ra (max) Surface Treatment Ra (max) Surface Treatment
μ-in. μ-m μ-in μ-m
-1   N/A N/A Mill Finish N/A N/A Mill Finish
-3   32 0.8 Mechanical Polish N/A N/A Mill Finish
-5   N/A N/A Mill Finish 32 0.8 Mechanical Polish
-7   32 0.8 Mechanical Polish 32 0.8 Mechanical Polish
PC SFF1 20 0.51 Mechanical Polish N/A N/A Mill Finish
PL SFF1 20 0.51 Mechanical Polish 32 0.8 Mechanical Polish
PD SFF4 15 0.38 Mechanical Polish & Electropolish N/A N/A Mill Finish
PM SFF4 15 0.38 Mechanical Polish & Electropolish 32 0.8 Mechanical Polish
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