This standard applies to hydraulic cylinder piston rod threads that use hydraulic oil (or compressed air) as the working medium. The piston rod thread system refers to the external connection thread of the piston rod of the hydraulic cylinder.
GB/T 2350-1980 history
2020GB/T 2350-2020 Fluid power systems and components—Cylinder piston rod thread types and dimensions
1980GB/T 2350-1980 Fluid power systems and components--Cylinders--Piston rod thread dimensions and types