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tech (415) 808-AHOYPage 1 of 2Surface FinishesBackgroundThe finish quality of a machined surface is very important in industries that require sanitarysurfaces such as Food, Biotech, Pharmaceutical, and Semiconductor manufacturing. Thereare a number of ways to define the Surface Finish, and thisTech Talk attempts to give asimple overview of the common terms. Surface finish measurement procedures, generalterminology, definitions of most parameters and filtering information can be found in AmericanStandard ASME - 2002, Surface Texture, and in International Standards, ISO 4287 andISO termsRa The most common surface roughness parameter is Ra, or Arithmetic AverageRoughness. It basically reflects the average height of roughness componentirregularities from a mean line. Ra provides a simple value for accept/rejectdecisions. It is a default parameter on a drawing if not otherwise specified, and isavailable even in the least sophisticated measuring instruments.

Tech Talk ClipperControls.com Tel (415) 808-AHOY Page 1 of 2 Surface Finishes Background The finish quality of a machined surface is very important in industries that require sanitary

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