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| Quality Keys: |
- Roughness of internal surface: 0.2um max.
- Tolerance of ID: H7,H8 can be satisfied.
- Straightness: 0.5mm/1000mm max.
- Internal surface imperfection is not allowed.
- External surface imperfection that doesn't
affect OD or W.T is allowed.
- Hardness of internal surface should be of
bigger value than that of external surface.
- beveled ends for skived&roller burnished
tubes because of the machining of tube ends
before skiving&roller burnishing.
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