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. 



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

Request a Quote

Want to get a free project review for your CNC machined parts?
Contact us now by email.

Apporo provides CNC turning/milling services, carrying out orders economically and deliver the highest-quality parts to your hands at the soonest speed. Apporo offers you a clear and open communication channel that allows handles the RFQ process, fulfills orders, and tracks package system.  

Why Choose APPORO CNC Services :

  • Our CNC Machining Services Advantages
  • Quality Assurance and Professional Testing
  • Professional CAD Drawing Services
  • Customized Solutions
  • Professional Surface Treatment Consultation
  • ISO 9001 Certification
  • RoHS and Safety Certification
  • See more about our service advantages

APPORO CNC ISO9001 Certification : Success is the sum of small efforts - repeated day in and day out.

Could you kindly let us know the primary purpose of your visit?