Abstract: A linear actuator intended to actuate in particular the leaf of a door including a motor the output shaft of which is connected to a screw, for example a righthand screw, with which is engaged a nut, integral with which is an arm parallel with the screw and connected by a friction torque-limiter to an intermediate member fixed in rotation and intended to be connected to a member which is to be actuated, such as a leaf. The nut includes a first profiled portion turned towards the outside and designated to cooperate, when this nut is occupying only one end position, with a second profiled portion in the form of a bayonet joint connected to the face of a fixed member, this second portion surrounding at least locally the screw and the nut. This bayonet joint is orientated so as to prevent the nut, when it reaches this axial end position, from turning in the same direction as the motor shaft and the screw.