which extends into distal housing section 112 and has on its outer surface an external thread 150 see fig1 the form of this thread is apparent in fig2 amp 21 it is in engagement with a complementary internal thread 152 fig1 of a threaded sleeve 154 serving as a dosing element which is guided in an axially movable manner in longitudinal grooves 156 fig1 of housing section 112 i e it cannot rotate relative to the latter if the proximal housing section 116 is rotated relative to the distal housing section 112 the dosing element 154 is moved axially relative to housing section 112 the position of dosing element 154 relative to housing section 112 thus determines the preselectable injection dose which can be adjusted to for example between 2 and 60 insulin units this is explained below in greater detail with reference to fig2 amp 21 in the region of the distal end the cylindrical inner side 158 of dosing element 154 expands to define a groove 160 which in the distal direction is limited by a stop 162 fig1 in the form of an annular shoulder and is limited in the proximal direction by a profiled shoulder 164 which can have in section the form of a circle segment or generally an inclined cam surface in practice the groove 160 is not continuous but rather has peripheral interruptions in order to make manufacture as an injection molded part easier the groove 160 and the shoulder 162 are needed for interaction with one of the below described clamping jaws 166 to 169 in the configuration shown in fig1 or 14 which represents the injection device 110 prior to an injection there rest in this groove 160 the proximal ends of four circumferentially equally spaced clamping jaws 166 167.