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Surface Roughness Table

Ra
micro-meters
Ra
micro-inches
N Code
0.025 1 1 ▽▽▽▽
0.05 2 2
0.1 4 3
0.2 8 4
0.4 16 5 ▽▽▽
0.8 32 6
1.6 63 7
3.2 125 8 ▽▽
6.3 250 9
12.5 500 10
25 1000 11
50 2000 12 S


* micro-meters(um) = 0.001mm

** micro-inches(u") = 0.0254um