The connector element, in particular SFP connector, contains a locking mechanism for forming a lockable plug-type connection between the connector element and a mating piece. For this purpose, a locking element is formed. The locking element is mounted in rotatably movable fashion, wherein, in the case of actuation of an actuation element, in particular a pull tab, the locking element is rotated out of a locking position into an open position. In order to exert a restoring force for return to the locking position, a spring steel sheet is disposed which is supported on a housing part and which exerts a spring force on the locking element counter to the force brought about by the actuating element. Expediently, a plurality of spring lugs are formed which exert a spring force on the locking element in different directions.