Specification (规格): Cylinder ID:40mm-400mm
Material (材质) :20# (A106B , ST45, E255)、45#(CK45)、16Mn(ST52, E355)、25Mn、27SiMn
Precision (精度): ID Tolerance: H8
Straightness: 0.2-0.5mm/M
Condition: BKS
Roughness: ≤0.4um
Thickness Tolerance: ±5%
Chrome thickness : usually 15-30 Microns
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