Screw element and system for fastening a liquid-conducting line

A system comprising at least one screw element and a line fastened or fastenable to the screw element, comprising an internal torque limitation for fastening the line to a counter-piece, a connection part, an actuation part;

• and a torque limiting unit that limits a torque that can be transmitted from the actuation part to the connection part, wherein the torque limiting unit is arranged between the connection part and the actuation part and has a limiting element that can be assembled from at least two limiting element parts connectable to one another and that limits the torque limiting unit in an axial direction of a longitudinal axis of the screw element, wherein the torque limiting unit has an entrainment element that can be at least sectionally arranged between the connection part and the actuation part and that transmits a movement of the actuation part to the connection part, and wherein the entrainment element has entrainment projections at at least one side, said entrainment projections being able to be brought into an operative connection with corresponding recesses provided at the connection part.