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China Surface Finish Standards

Ra values for common manufacturing processes

Surface Finish Standards

China GradeRa (microns)Manufacturing Process
▽ (N12)50Rough sawing
▽▽ (N10)12.5Rough turning/milling
▽▽▽ (N7)1.6Fine machining
▽▽▽▽ (N5)0.4Grinding
▽▽▽▽▽ (N3)0.1Lapping/polishing
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