Finish
μinch
μm
finishing
Machining
Machining
Machining
μinch = Microinch
μm = Micrometre
| Finish | Symbol | N
Finish |
Ra μinch |
Ra μm |
|---|---|---|---|---|
| Super finishing |
|
N1 | 1 | 0.025 |
| Lapping | N2 | 2 | 0.05 | |
| N3 | 4 | 0.1 | ||
| Grinding |
|
N4 | 8 | 0.2 |
| N5 | 16 | 0.4 | ||
| N6 | 32 | 0.8 | ||
| Smooth Machining |
|
N7 | 63 | 1.6 |
| N8 | 125 | 3.2 | ||
| Medium Machining |
N9 | 250 | 6.3 | |
|
|
N10 | 500 | 12.5 | |
| Rough Machining |
N11 | 1000 | 25 | |
| N12 | 2000 | 50 | ||
| .000063 = Ra63
μinch = Microinch |
.0016 = Ra1.6
μm = Micrometre |
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Last Updated: 20 February 2015