BOZE CNC Ti | Surface Finish Reference Tool
Surface Roughness Comparator
Compare 9 surface finish levels from mirror polish to as-rough �?with Ra/Rz values, everyday object comparisons, achievable processes, and typical applications for each range.
Filter by process:
Ra Roughness Scale (µm)
Ra 0.1
Ra 0.2
Ra 0.4
Ra 0.8
Ra 1.6
Ra 3.2
Ra 6.3
MirrorAs-Rough
Mirror FinishRa 0.025
Rz 0.1 – 0.4 µm
Like a high-quality bathroom mirror
Ultra-Fine FinishRa 0.05
Rz 0.4 – 0.8 µm
High-end phone screen protector — smooth, barely any texture
Fine FinishRa 0.1
Rz 0.8 – 1.6 µm
New ceramic knife blade — smooth with faint lines
Smooth FinishRa 0.2
Rz 1.6 – 3.2 µm
New laptop chassis — smooth with slight directional texture
Standard MachinedRa 0.4
Rz 3.2 – 6.3 µm
Cast iron skillet — visible but uniform machining marks
Commercial MachinedRa 0.8
Rz 6.3 – 12.5 µm
Standard steel ruler — visible machining texture
Rough MachinedRa 1.6
Rz 12.5 – 25 µm
Coarse nail file — distinctly rough but uniform
Very RoughRa 3.2
Rz 25 – 50 µm
Unfinished concrete wall — rough, irregular texture
As-Rough / UnfinishedRa 6.3
Rz 50 – 100 µm
Rough gravel road — very coarse and irregular
Surface Finish Selection Guide
Functional Surfaces (Ra 0.05-0.2 µm): Critical sealing faces, bearing journals, and medical implant surfaces. Achieved by fine grinding, superfinishing, or precision turning.
Standard Machined (Ra 0.4-0.8 µm): General engineering surfaces, aerospace structural parts, and hydraulic components. Standard CNC milling and turning output.
Non-Critical (Ra 1.6-3.2 µm): Internal cavities, weld prep surfaces, and concealed structural elements. Rough machining or as-forged surfaces.
Measurement: We verify surface finish using Mitutoyo SJ-410 profilometers. Full surface roughness reports available per ASTM B46.1.
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