... ASTM,DIN,JIS,BS satandard H8~H9 honed tube for hydraulic cylinder1 OD32-500mm W.T.3.5-80mm2 ISO ... 3~1mm/m4 Inside Roughness:0.4~0.8umsteel pipes for hydraulic useMaterial: C20, CK45, etc. also ST52 if given ... Power, Coal, Machinery, Low and high-pressure boiler, hydraulic prop and so on.InvitationWelcome to Our two factories. I ... : http://www.cnxinglong.cn H8~H9 honed tube for hydraulic cylinder