An assembly for a drug delivery device (1) is provided comprising a screw member (23) comprising a thread (33), the thread (33) comprising at least two consecutive portions, the portions having different leads. The device (1) further comprises a nut member(22), wherein the nut member (22) and the screw member (23) are adapted and arranged to be rotated with respect to one another about a rotational axis (34) during a dose setting operation of the assembly, the nut member (22) thereby being axially displaced along the screw member (23) from a start position to an end position with respect to the screw member (23) due to mechanical cooperation of the nut member (22) with the thread (33).The assembly is configured such that, in a first portion (23a) of the thread (33), the nut member (22) comprises a first position with respect to an axis (43) transversal to the rotational axis (34) and in a second portion (23b) of the thread (33), the nut member (22) comprises a second position with respect to the axis (43) transversal to the rotational axis (34), wherein the nut member (22) is configured to perform a tilting movement from the first position into the second position when the nut member (22) passes from the first portion (23a) to the second portion (23b).Furthermore, a drug delivery device (1) comprising the assembly is described.La présente invention concerne un ensemble pour un dispositif (1) d'administration de médicament, comprenant un élément (23) de vis comprenant un filetage (33), le filetage (33) comprenant au moins deux parties consécutives, les parties ayant différents pas. Le dispositif (1) comprend en outre un élément (22) d'écrou, l'élément (22) d'écrou et l'élément (23) de vis étant adaptés et agencés pour être mis en rotation l'un par rapport à l'autre autour d'un axe (34) de rotation au cours d'une opération de définition de dose de l'ensemble, l'élément (22) d'écrou étant ainsi déplacé axialement le long de l'élément (23) de vis à partir d'une position
