Abstract: The invention relates to a magnetic-inductive flowmeter for measuring the flow of a flowing, conductive medium. The flowmeter has a measuring tube, a magnetic field generating device, two pin shaped measuring electrodes, insertion parts each having a through-hole through which the two measuring electrodes respectively extend, the measuring electrodes have at least in sections a non-circular cross section and the through-holes of the two insertion parts have a contour complementary thereto. The pin shaped measuring electrodes are at least partially provided with an external, thread and a nut is respectively screwed thereon, by means of which the measuring electrodes and the associated insertion parts are respectively firmly connected to the measuring tube.