A connector part for connecting a material supply device to a spray gun includes a hollow cylindrical connection piece; a threaded wedge element with a lower starting point and an upper end running around the outer circumference of connection piece and serving to produce a threaded wedge connection to a counter-element arranged on gun base of spray gun; and a stop element that forms a limit stop during the production of the threaded wedge connection. In order to prevent the counter-element on the spray gun from digging into the soft connection pipe made of plastic and removing plastic chips there, it is provided in the connector part according to the invention that stop element is arranged at a distance in the circumferential direction from upper end of threaded wedge element, whereby a gap is formed between stop element and upper end of the threaded wedge element. In additional embodiments of the invention it is provided that the inclination of threaded wedge element runs more steeply at lower starting point than in the other area, or that threaded wedge element has a smaller cross section in the axial direction at lower starting point or at upper end than in its central area.