A linear electromechanical actuator, comprising: a housing (1, 3, 4, 5, 6), an electric motor (22, 23), a roller screw drive (7, 8, 9) arranged within the housing, and an output member, configured for translational movement with respect to the housing, wherein the electric motor comprises a stator fixed to an inner surface of the housing and a rotor, the rotor being arranged to transmit rotational motion to the roller screw drive, the roller screw drive comprises a cylinder with an internal thread, the cylinder is rotatably mounted within the housing, a screw mounted within the cylinder and having an external thread, and threaded rollers, the rollers are mounted in said cylinder to engage between the internal thread of the cylinder and the external thread of the screw for translational movement within the cylinder, and a rod, the rod being connected to the screw to form the output member, the rod having an axial opening at the end proximal to the screw, the actuator being characterized in that: the screw comprises a connecting section at the end proximal to the rod with a plurality of longitudinal teeth arranged along the perimeter of the connecting section, the longitudinal teeth of the connecting section are embedded into the surface defined by the axial opening, and the actuator further comprises a retainer, the retainer is arranged to engage with the rod and the screw so as to prevent longitudinal movement of the rod relative to the screw; wherein the teeth are arranged at an angle to the axis of the screw, and the axial opening in the rod defines a tapered section for interacting with the teeth of the screw. a housing (1, 3, 4, 5, 6), an electric motor (22, 23), a roller screw drive (7, 8, 9) arranged within the housing, and an output member, configured for translational movement with respect to the housing, wherein the electric motor comprises a stator fixed to an inner surface of the housing and a rotor, the rotor being arranged to transmit rotational motion to the roller screw drive, the roller screw drive comprises a cylinder with an internal thread, the cylinder is rotatably mounted within the housing, a screw mounted within the cylinder and having an external thread, and a cylinder with an internal thread, the cylinder is rotatably mounted within the housing, a screw mounted within the cylinder and having an external thread, and threaded rollers, the rollers are mounted in said cylinder to engage between the internal thread of the cylinder and the external thread of the screw for translational movement within the cylinder, and a rod, the rod being connected to the screw to form the output member, the rod having an axial opening at the end proximal to the screw, the actuator being characterized in that: the screw comprises a connecting section at the end proximal to the rod with a plurality of longitudinal teeth arranged along the perimeter of the connecting section, the longitudinal teeth of the connecting section are embedded into the surface defined by the axial opening, and the actuator further comprises a retainer, the retainer is arranged to engage with the rod and the screw so as to prevent longitudinal movement of the rod relative to the screw; wherein the teeth are arranged at an angle to the axis of the screw, and the axial opening in the rod defines a tapered section for interacting with the teeth of the screw. the screw comprises a connecting section at the end proximal to the rod with a plurality of longitudinal teeth arranged along the perimeter of the connecting section, the longitudinal teeth of the connecting section are embedded into the surface defined by the axial opening, and the actuator further comprises a retainer, the retainer is arranged to engage with the rod and the screw so as to prevent longitudinal movement of the rod relative to the screw; wherein the teeth are arranged at an angle to the axis of the screw, and the axial opening in the rod defines a tapered section for interacting with the teeth of the screw.