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Home / All / CNC Machining Process & Technology / What does Ra 0.2 µm mirror finishing mean for Optical lens barrel & mount?
What does Ra 0.2 µm mirror finishing mean for Optical lens barrel & mount?
In plain buyer terms
Ra is roughness. Lower Ra = smoother, cleaner, less friction and easier to sterilize or seal. LusterControl reaches Ra 0.6 μm (standard), up to 8K mirror Ra 0.2 μm on stainless. For Optical lens barrel & mount where scratch-free Ra and bore roundness, that smoothness is often the difference between a seal that holds and one that weeps.
What to ask your supplier
- Request the Ra value on the print, not just "polished".
- Ask for a surface-profile trace, not a photo.
- Confirm electropolishing is done in-house so lead time stays short.
Low-moq prototyping and a fast path to first articles.
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