Titanium Surface Roughness Standards by Application
Surface roughness requirements for titanium components across aerospace medical and industrial applications.
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Source: ASME B46.1 ISO 1302
| Property | Value | Unit | Notes |
|---|---|---|---|
| Medical implant bearing Ra | 0.05-0.1 | µm | Electropolish |
| Aerospace structural Ra | 0.4-0.8 | µm | Finish mill |
| Semiconductor UHV Ra | 0.1-0.2 | µm | Electropolish |
| Chemical processing Ra | 0.8-1.6 | µm | As-machined |
| Marine propeller Ra | 0.8-3.2 | µm | Machined/ground |
Surface Finish by Application
| Application | Ra Required | Process |
|---|---|---|
| Medical implant bearing | 0.05-0.1 µm | Electropolish |
| Aerospace structural | 0.4-0.8 µm | Finish mill |
| Semiconductor UHV | 0.1-0.2 µm | Electropolish |
| Chemical processing | 0.8-1.6 µm | As-machined |
| Automotive cosmetic | 0.05-0.2 µm | Polish |
| Marine propeller | 0.8-3.2 µm | Machined/ground |
Evidence Basis
Based on ASME B46.1 and ISO 1302, which define surface-texture measurement methodology and symbology — they do NOT prescribe per-application Ra values. The Ra-by-application figures below are titanium.blog’s engineering recommendations, not standard requirements.
Engineering Interpretation (titanium.blog)
(titanium.blog) ASME B46.1 / ISO 1302 standardize how Ra is measured and drawn, but selecting the target Ra for a given application is an engineering judgment. The values here are titanium.blog’s typical recommendations (e.g., electropolished bearing surfaces to 0.05-0.1 µm, aerospace structural finish-milled to 0.4-0.8 µm). Verify against the end-customer drawing.