Actuator bolts and brake caliper including said actuator.

Screen actuator, including a housing (17), a motor (7), an actuating member (10) and a screw mechanism (5) which provides a linear movement of the drive member relative to the housing in response to a rotary movement of motor (7), which screw mechanism (5) comprises a screw (11), a nut (14) which engage with rotary elements (13), each said screw (11) and a nut (14) which are fastened rotatably relative to the housing (17), and gear means speed reduction (6), characterized by the fact that the nut (1 4) is fixed relative to the housing (17) and the screw (11 ) is held rotatably relative to the housing by the rotating elements (13).