Screw-threaded working cylinder

A screw-threaded working cylinder, comprising:

• a tubular cylinder having an end region, said end region having a first thread, said end region having a tapered wall section, said tapered wall section having an axial annular surface, a wall thickness of said tapered wall section being at most 60% of a wall thickness of said tubular cylinder;
• a closure having a second thread, said closure being screwed by said second thread into said first thread in a final mounting position, said closure having a mating axial annular surface;
• said axial annular surface and said mating axial annular surface being pressed in a positive fitting contact to one another in the final mounting position for defining a pressure contact surface, said pressure contact surface defining a sealing plane, and a surface pressure in an area of said pressure contact surface causing a deformation of said tubular cylinder and said closure, the deformation occurring within an elastic limit over a range from zero applied pressure to a maximum permissible pressure by a pressure medium for the working cylinder;
• and
• a piston unit being accommodated in said tubular cylinder.