Abstract: A device for decoupling an inner part and an outer part of a constant velocity joint from each other has a fastening element for gripping the inner part, an annular part placed in the end of the outer part of the joint and a nut that fits to the thread in the end of the outer part, which nut is wider than the hole in the annular part and the parts can be decoupled in a simple and safe way and without breaking the parts.