... Grade: ST52,ST52.3,CK45,E355,16Mn,STKM13C,SAE1020 Hydraulic Cylinder Honed Tube/Honed Tube/Burnished Tube Grade: ST 52,ST52 ... 12 MeterStraightness: < 0.5 mm/mTolerance OD: DIN 2391Tolerance INT: ISO H7, H8, H9Roughness(Ra): < 0.8 MicronType: BK+S,high ...