Abstract: The locking system, which is intended to axially secure the rotor (1), of a laboratory centrifuge, wherein said rotor can be placed onto a rotatably mounted shaft (3) that extends vertically, is characterized by an arrangement of a plurality of locking levers (7), which are each pivotably mounted about axes (8) extending perpendicularly to the shaft (3) between a locking position and an unlocking position in planes containing the axes (2), wherein said locking levers can each be automatically transferred from the unlocking position to the locking position and from the locking position to the unlocking position depending on rotational speed. The locking levers (7) are mounted on the rotor (1), and an annular groove (6) is provided on the shaft (3), said annular groove engaging with the locking levers (7) in the locking position, wherein the locking levers (7) are prestressed in the unlocking position.