Self-Locking Belt Retractor

A self-locking belt retractor having at least one vehicle-sensitive controlled blocking system for a belt winding shaft in which a vehicle-sensitive mass (14) moves a locking lever (17) with its engaging tip (18) engaged in the toothing (29) of a controlled disk when activated, so that the control disk is stopped in its rotary motion together with the belt winding shaft and consequently activates the blocking system, the retractor comprising the sensor mass (14) being arranged in a vertical position in a holder part (10) on a support surface (23) that can be tilted in the holder part (10) in response to vehicle accelerations, the locking lever (17) being coupled with the sensor mass (14) on an end (19) facing away from the engaging tip in a form-fitting manner and forming a support (21), the form fit occurring in an extension (15) of the sensor mass (14) which protrudes through a hole (33) in the contact surface (23) of the holder part, the border of the hole (33) facing the locking lever (17) forming a projection (31) projecting radially inwardly through a circle formed by the hole (33) which is contacted by the locking lever (17) in case of a deflection of the mass (14).