A chuck apparatus for the fastening to a working spindle (2) of a tool machine, with a chuck body (8) comprising a receptacle (7) for the working spindle (2), with at least two chuck jaws (9) which can be adjusted radially to the body axis, and with a drive ring (10), for whose rotation taking place in the circumferential direction a drive (11) is provided, comprising a structure is formed on the drive ring (10) on its outer circumference or its inner circumference for each chuck jaw (9) and which serves for its adjusting. The invention furthermore relates to a rapid replacement system (1) with the chuck apparatus (3) as a base flange (4) and with a replacement flange (5).

A chuck apparatus for the fastening to a working spindle (2) of a tool machine, with a chuck body (8) comprising a receptacle (7) for the working spindle (2), with at least two chuck jaws (9) which can be adjusted radially to the body axis, and with a drive ring (10), for whose rotation taking place in the circumferential direction a drive (11) is provided, comprising a structure is formed on the drive ring (10) on its outer circumference or its inner circumference for each chuck jaw (9) and which serves for its adjusting. The invention furthermore relates to a rapid replacement system (1) with the chuck apparatus (3) as a base flange (4) and with a replacement flange (5).