Abstract: A tool for shrink-fitting mechanical parts includes a fixed portion, a movable portion movable relative to the fixed portion, a support for a part to be shrink-fitted, a docking part for docking the tool on a hoop, and an actuator displacing the movable portion when the part to be shrink-fitted is detected in a shrink-fitting position on the hoop receiving the part. In particular, the fixed portion includes a fixed jaw and a housing, and the movable portion includes a movable jaw and a housing. The support and the docking part are disposed in the corresponding housing, respectively, so that the support and the docking part determine sets of parts to be shrink-fitted and/or of hoop parts for the tool. The housings dispose on the tool the docking part and the support with geometric reference to the hoop.