A hydraulic cylinder may include a cylinder body having an open end with an opening, a piston rod movable back and forth, a close-off member having an insert part protruding in a fitting manner into the open end of the cylinder body, the close-off member having a flange opposing the edge of the cylinder body, a coupling means operable between the inner surface of the cylinder body and the outer circumferential face of the insert part to secure, in at least one axial direction, the close-off member in the cylinder body, the coupling means including a radially-compressible coupling ring, and a clamping ring clamped between the flange and the edge at the open end of the cylinder body, the clamping ring being made of a resilient, compressible material, the clamping ring being clamped, when compressed in the axial direction, between the flange and the edge at the open end.