SURFACE FINISH CROSS REFERENCE CHART
GRITUSACOMMON[USA] RaE/P RANGE[UK] RaRmax[JAPAN] Rmax APPROX. RMSISOASTM #NAMEMICROINCHRa MICROINCHMICRONMICROINCHMICRONMICROINCHN UMBERRa #1Mill Plate25050 #2Satin Sheet70 - - 120#35258120#4Commercial #440 - 60 #43A Sanitary Finish42 - 4746 - 35ANSI #4 Sanitary #430 - 203425 #10020 - 30200 - 220#4SBiothech Finish25 - 25240#615 - 2010 - 15178 - - 15320#712 - - 14Buff # #300400#8Mirror Finish4 - 8500#8Supermirror FINISH < 43 - 8500#8Supermirror - 10N3Buff # FINISH CROSS REFERENCE CHARTCommon USA name. ASTM A480.
grit usa common [usa] ra e/p range [uk] ra rmax [japan] rmax approx. rms iso astm std japanese no. finish # name microinch ra microinch micron microinch micron microinch number ra microinch standard
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