Abstract: The invention relates to hydraulic screw machines of the type having a screw array in a sealingly surrounding housing. The object of the invention is to reduce the length of the machine with unchanged number of seals in the screw array. This is achieved by providing at least one of the inlet and outlet openings to the screw array as a bore extending radially through the housing and in such a position that in at least some angular position of the screw array, it seals against the housing wall in the region which is within the axial extension of the opening.