Combined product comprising a screw nipple and a threaded bush for the stable and compact hydraulic connection of two hydraulic components (460, 500) which are to be aligned with respect to one another, the screw nipple comprising: a throughflow channel which is configured to produce the hydraulic connection between the two hydraulic components (460, 500) at least in sections; an external connecting thread which is configured and arranged in such a way that it can be screwed to an internal connecting thread of a sleeve component of the threaded bush which is mounted on a second hydraulic component of the two hydraulic components, in order to produce the stable and compact hydraulic connection between the two hydraulic components (460, 500) when the screw nipple is mounted on a first hydraulic component; and a seat for a soft connecting seal, the seat for the soft connecting seal being arranged in such a way that the soft connecting seal is pressed against a sealing face of the threaded bush in a connected state, with the result that a discharge of a liquid from the throughflow channel between the screw nipple and the threaded bush is substantially prevented; the screw nipple comprising, furthermore, an external mounting thread which is configured to be capable of being screwed into an internal mounting thread of the first hydraulic component of the two hydraulic components (460, 500) which are to be connected to one another; the threaded bush comprising: a threaded sleeve and the union component with the internal connecting thread, the threaded sleeve comprising a throughflow channel which is configured to produce the hydraulic connection between the two hydraulic components (460, 500) at least in sections; the threaded bush comprising, furthermore, an external mounting thread which is configured to be capable of being screwed into an internal mounting thread of the second hydraulic component of the two hydraulic components (460, 500) which are to be connected to one another. a throughflow channel which is configured to produce the hydraulic connection between the two hydraulic components (460, 500) at least in sections; an external connecting thread which is configured and arranged in such a way that it can be screwed to an internal connecting thread of a sleeve component of the threaded bush which is mounted on a second hydraulic component of the two hydraulic components, in order to produce the stable and compact hydraulic connection between the two hydraulic components (460, 500) when the screw nipple is mounted on a first hydraulic component; and a seat for a soft connecting seal, the seat for the soft connecting seal being arranged in such a way that the soft connecting seal is pressed against a sealing face of the threaded bush in a connected state, with the result that a discharge of a liquid from the throughflow channel between the screw nipple and the threaded bush is substantially prevented; the screw nipple comprising, furthermore, an external mounting thread which is configured to be capable of being screwed into an internal mounting thread of the first hydraulic component of the two hydraulic components (460, 500) which are to be connected to one another; the threaded bush comprising: a threaded sleeve and the union component with the internal connecting thread, the threaded sleeve comprising a throughflow channel which is configured to produce the hydraulic connection between the two hydraulic components (460, 500) at least in sections; the threaded bush comprising, furthermore, an external mounting thread which is configured to be capable of being screwed into an internal mounting thread of the second hydraulic component of the two hydraulic components (460, 500) which are to be connected to one another. a threaded sleeve and the union component with the internal connecting thread, the threaded sleeve comprising a throughflow channel which is configured to produce the hydraulic connection between the two hydraulic components (460, 500) at least in sections; the threaded bush comprising, furthermore, an external mounting thread which is configured to be capable of being screwed into an internal mounting thread of the second hydraulic component of the two hydraulic components (460, 500) which are to be connected to one another.