QJ 2106-1991 Hydraulic quick-change joint universal specification

GB/T 2351-1993 Fluid power systems and components—Connectors and associated components—Outside diameters of tubes and inside diameters of hoses GB/T 2351-2005 Fluid power systems and components—Connectors and associated components—Nominal outside diameters of tubes and nominal inside diameters of hoses GB/T 2351-2021 Fluid power systems and components—Outside diameters of tubes and inside diameters of hoses GB/T 308-2002 Rolling bearings—Steel balls GB/T 308.1-2013 Rolling bearings—Balls—Part 1:Steel balls GB/T 308.2-2010 Rolling bearings—Balls—Part 2:Ceramic balls GJB 145 QJ 976-1986 Hydraulic System and Components Pressure and Temperature Classification