253 Arithmetic Average Roughness Ra Traditional Roughness Notations Maximum Height Rmax. Reference Value of Standard Length (mm) Finish Symbol Forging Casting Die Casting Hot Rolling Cold Rolling Drawing Extruding Tumbling Sand Blasting Rolling Face Milling Planing Carving / Slotting Milling Precision Boring Filing Round Turning Boring Drilling Reaming Broaching Shaping Polishing Honing Stone Lapping Buff Finishing Fine Sanding Lapping Hydro Honing Burnishing Roller Finishing Sinker EDM Wire Cut, EDM Chemical Polishing Electropolishing 0.025 0.1 −S 0.25 0.05 0.2 −S 0.1 0.4 −S 0.2 0.8 −S 0.4 1.6 −S 0.8 0.8 3.2 −S 1.6 6.3 −S 3.2 12.5 −S 2.5 6.3 25 −S 12.5 50 −S 8 25 100 −S 50 200 −S 25 − 100 400 −S Processes Precise Precise Precise Precise Precise Precise Precise Precise Precise Precise Precise Precise Precise Fine Fine Medium Coarse Precise Precise Precise Precise Precise Medium Coarse GeneralTechnical Information Roughness Ranges by Various Processes
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