A dual-shaft shredder for comminuting solids or solids in liquids, comprising: - a housing defining an interior comminuting space, - an inlet opening in the housing for feeding solids into the comminuting space, - an outlet opening in the housing for discharging comminuted solids out of the comminuting space, - a first cutting disc block having a plurality of first cutting discs (101, 102) disposed on a first hub body such that an intermediate space is present between each two adjacent first cutting discs (101, 102), - a second cutting disc block having a plurality of second cutting discs (103, 104) disposed on a second hub body such that an intermediate space is present between each two adjacent second cutting discs (103, 104), - the first and second cutting disc blocks (10, 12) being axially offset from each other, such that at least some of the first cutting discs (101, 102) each engage in an intermediate space between two adjacent second cutting discs (103, 104) and some of the second cutting discs (103, 104) each engage in an intermediate space between two adjacent first cutting discs (101, 102), - wherein the first and second cutting disc blocks (10, 12) each comprise a first axial recess (34, 36), - a first shaft stub extending into the first axial recess of the first cutting disc block for transmitting torques, - a second shaft stub extending into the first axial recess of the second cutting disc block for transmitting torques, - a first clamping device for clamping the first shaft stub against the first cutting disc block under tension, - a second clamping device for clamping the second shaft stub against the second cutting disc block under tension, characterized by - a first and a second axle insert (26, 28), wherein the first and second cutting disc blocks (10, 12) each comprise a second axial recess (38, 40) and the first axle insert is received in the second axial recess of the first cutting disc block and the second axle insert is received in the second axial recess of the second cutting disc block, wherein the first and second axial recesses (34, 36, 38, 40) are each connected to each other by an axial bore, and wherein the clamping devices comprise means for clamping the first axle insert against the first shaft stub and the second axle insert against the second shaft stub. - a housing defining an interior comminuting space, - an inlet opening in the housing for feeding solids into the comminuting space, - an outlet opening in the housing for discharging comminuted solids out of the comminuting space, - a first cutting disc block having a plurality of first cutting discs (101, 102) disposed on a first hub body such that an intermediate space is present between each two adjacent first cutting discs (101, 102), - a second cutting disc block having a plurality of second cutting discs (103, 104) disposed on a second hub body such that an intermediate space is present between each two adjacent second cutting discs (103, 104), - the first and second cutting disc blocks (10, 12) being axially offset from each other, such that at least some of the first cutting discs (101, 102) each engage in an intermediate space between two adjacent second cutting discs (103, 104) and some of the second cutting discs (103, 104) each engage in an intermediate space between two adjacent first cutting discs (101, 102), - wherein the first and second cutting disc blocks (10, 12) each comprise a first axial recess (34, 36), - a first shaft stub extending into the first axial recess of the first cutting disc block for transmitting torques, - a second shaft stub extending into the first axial recess of the second cutting disc block for transmitting torques, - a first clamping device for clamping the first shaft stub against the first cutting disc block under tension, - a second clamping device for clamping the second shaft stub against the second cutting disc block under tension, characterized by - a first and a second axle insert (26, 28), wherein the first and second cutting disc blocks (10, 12) each comprise a second axial recess (38, 40) and the first axle insert is received in the second axial recess of the first cutting disc block and the second axle insert is received in the second axial recess of the second cutting disc block, wherein the first and second axial recesses (34, 36, 38, 40) are each connected to each other by an axial bore, and wherein the clamping devices comprise means for clamping the first axle insert against the first shaft stub and the second axle insert against the second shaft stub.