... 20#,45#,16Mn,25Mn,27SiMnGB/T8713-88ISO4394/1-1980E Hydraulic Cylinder Honed Tube &Pipe feature: 1)Grade 20# 45 ... tolerance of tube size10)The tubes are specialized in hydraulic cylinder, and other cylinders.automobile parts, motorcycle part, shock ... factory engineer team. We warmly welcome friends from all over the world to visit our factories for business negotiation and cooperation. hydraulic cylinder ...