A screw separator for separating solids out of suspensions, includes at least one housing and at least one feed pipe for the suspension, at least one discharge pipe for liquids, and at least one outlet for the at least partially dewatered solids wherein at least one strainer basket is provided in the housing in which a screw is rotatably mounted, and that the worm shaft of the screw terminates inside the housing and is continued by way of a separate pipe-like structure.