Boze Titanium Manufacturing Center | 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.
About Boze Titanium Manufacturing Center
One Metal. One Focus. Infinite Precision.
Founded in 2011 in Baoji's Titanium Valley, BOZE Metal is dedicated exclusively to titanium — from raw material to precision engineering. AS9100D, ISO 13485 & ISO 9001 certified with 500+ clients across Aerospace, Medical & Motorsport industries, we deliver end-to-end precision titanium CNC machining with full material traceability from source to component.
Boze Titanium Manufacturing Center is operated by Baoji Boze Metal Products Co., Ltd.
AS9100D ISO 13485 ISO 9001 500+ Clients 15+ Years OEM/ODM