Surface Roughness Table
Surface roughness Ra is a measurement of the deviation of a surface from a mean height. The lower Ra measurement, the higher grade surface quality. At the same time, the more machining process will be required. Generally speaking, a workpiece completed by CNC lathe or milling could reach a surface roughness between Ra 0.8-3.2.
Based on the capability of our CNC machining service, we are capable of manufacturing aluminum alloy parts with suface roughness between Ra 0.1-0.2 where is required on an ABS system for optimized piston movement. Normally, we supply the machined parts within Ra0.8-3.2. For your reference, the higher grade surface roughness, the more expensive production cost.
| 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
