Surface Roughness
We engineer and produce complex industrial ceramic parts for our customers.
On time, and on budget.
Older drawings may use roughness grade numbers to indicate Ra value. The following table is gven in ISO 1320:1992.
| Roughness values (Ra) micrometers | Roughness values (Ra) microinches | Roughness Grade numbers |
|---|---|---|
| 50 | 2000 | N12 |
| 25 | 1000 | N11 |
| 12.5 | 500 | N10 |
| 8.3 | 250 | N9 |
| 3.2 | 125 | N8 |
| 1.6 | 63 | N7 |
| 0.8 | 32 | N6 |
| 0.4 | 16 | N5 |
| 0.2 | 8 | N4 |
| 0.1 | 4 | N3 |
| 0.05 | 2 | N2 |
NOTE: The information set forth herein is offered for comparison only, and is not to be considered as absolute engineering data, or constituting a warranty or representation for which we assume legal responsibility.
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