Surface Roughness Conversion Chart. Surface roughness ot texture is the measure if the finer surface irregularities in the surface texture and is composed of three components: roughness, waviness and form.These are the result of the manufacturing process employed to create the surface.Surface roughness average (Ra), also know as arithmetric average (AA) is rated as the arithmetic average deviation of the surface valleys and peaks expressed in micro inches or micro meters.ISO standards use the term CLA (Center Line Average).hese are the result of the manufacturing process employed to create the surface. Surface roughness average (Ra), also know as arithmetric average (AA) is rated as the arithmetic average deviation of the surface valleys and peaks expressed in micro inches or micro meters.
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