The self-locking axis (1) has an axis region (10) and a head region (20), used for fitting the axis in a holder and provided with spring clips (30) for locking the axis in the holder upon a defined rotational movement, during assembly of the axis in the holder. Also included are Independent claims for the following: (a) a holder for reception of a self-locking axis; (b) a method for assembly of a self-locking axis in a holder; (c) a pedal system for an automobile; (d) a handbrake lever system for an automobile
