A shaft according to the application for an endoscopic instrument has a connecting section arranged in a distal end region of the shaft, with a connecting device for connection, in particular in the manner of a bayonet connection, with a replaceable working insert being formed at said connecting section, the connecting device having a first engagement structure for a connection engagement of an engagement element of a working insert of a first type, and the connecting device having a second engagement structure for a connection engagement of an engagement element of a working insert of a second type, wherein the first and the second engagement structures are arranged and/or formed differently. The application also relates to an endoscopic instrument and an endoscopic system.
