Roughness

Roughness value Ra (μm) 50 25 12.5 6.3 3.2 1.6 0.8 0.4 0.2 0.1 0.05 0.025
Roughness value Ra (μin) 2000 1000 500 250 125 63 32 16 8 4 2 1
Roughness grade number N12 N11 N10 N9 N8 N7 N6 N5 N4 N3 N2 N1
Roughness grade symbol ~ V VV VVV VVVV
Flame cutting ----- ----- -----
Snagging ----- ----- ----- -----
Sawing ----- ----- ----- ----- ----- -----
Planing, shaping ----- ----- ----- ----- ----- -----
Drilling ----- ----- ----- -----
Chemical milling, Elect. discharge mach ----- ----- ----- -----
Milling ----- ----- ----- ----- ----- ----- -----
Broaching, Reaming ----- ----- ----- -----
Electron-beam, laser ----- ----- ----- ----- -----
Electro-chemical ----- ----- ----- ----- ----- ----- ----- -----
Boring, turning ----- ----- ----- ----- ----- ----- ----- ----- ----- -----
Barrel finishing ----- ----- ----- ----- ----- ----- -----
Electrolytic grinding, Roller burnishing ----- ----- -----
Grinding ----- ----- ----- ----- ----- ----- ----- -----
Honing ----- ----- ----- ----- ----- -----
Electro polish ----- ----- ----- ----- ----- ----- ----- -----
Polishing ----- ----- ----- ----- ----- ----- -----
Lapping ----- ----- ----- ----- ----- -----
Superfinishing ----- ----- ----- ----- ----- -----
Sand casting, Hot rolling ----- ----- -----
Forging ----- ----- ----- -----
Perm mold casting ----- ----- -----
Investment casting ----- ----- ----- -----
Extruding ----- ----- ----- ----- -----
Cold rolling, Drawing ----- ----- ----- ----- -----
Die casting ----- ----- -----
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