honed tubes are directly used for hydraulic cylinders. ID tolerance achieve H8 Surface roughness:Ra0.4 Max Productcarbon seamless steel tube/pipe/ honed tubeBrandHengtongCapacity250,000 tons/yearThickness4mm-70mmOD3/4"~12" / 25mm-325mmStandardASTM A106 GR B , ASTM A53 GR B, ASTM A178 GR C, ASTM A1045, A210,A5140SAE1020,SAE1045JIS G4051 S20C ,JIS G4051 S45C,JIS G 3461,JIS G 3455,JIS G 3456,JIS ...