a device for the advancement of bars , particularly narrow bars , in automatic loaders provided with a inclined supporting plane or with another loading system for a plurality of bars and with a mechanism for the individual release of the bars , comprising : guides , whereon supporting elements for a bar released from the plane and a carriage provided with grip elements for a bar can slide , the carriage being actuated between an initial position , where the grip elements are actuated so as to grip a bar deposited on the supporting elements , and a final position , where the bar is released by the grip elements and is secured in the spindle of an automatic lathe ; a pusher which is supported so as to move parallel to itself ; and actuators for actuating the pusher after the carriage between an offset position and a position wherein it is aligned with the bar deposited on the supporting elements when the carriage is in the final position .