Hydraulic Cylinder Honed Tube/Seamless Cylinder Tube  Application: Hydraulic Cylinder, Hydraulic Jack Standard: GB/T8713-88, ISO439/1-1980(E) Steel Grade: ST52, ST52.3, E355, S235, 20#, 45#, 16Mn etc OD Size: 30 mm to1000mm Max Length: 12 meters Roughness (Ra): 0.2 to 0.8 um Straightness: 0.5 mm/1000mm Tolerance EXT: DIN 2391 Tolerance INT: ISO H7,H8,H9 Type: Cold Drawn, Cold roll, Honed, Skived, Burnished Conservation: Anti rust oiled both inside and outside surface, plastic caps in both ends
