Honed Tube/Seamless Hone Tube/Hydraulic Cyinder Tube Grade: ST 52.3,CK 45,E 355,16Mn,STKM-13C,SAE1020,SAE 1045 Metric size: O.D: 30 to 1000mm, Max length 12m. Straightness: < 0.2/1000 Tolerance EXT: DIN 2391 Tolerance INT: ISO H7,H8 ,H9,H10 Roughness(Ra): 0.2 to 0.4 Micron Type:cold drawing,seamless honed,skived and burnished,BK+S
