A clamping and/or braking device for clamping and/or braking an object to be clamped and/or braked, comprising: a housing comprising a first housing part and a second housing part, wherein each of the housing parts (3a, 3b) comprises an annular recess defining a first contact surface of the housing part (3a, 3b) and a second contact surface of the housing part (3a, 3b), and wherein the two housing parts (3a, 3b) are arranged relative to each other and fastened to each other such that the recesses of the first and second housing parts (3a, 3b) together form an inner space within the housing; a spring arranged in the inner space comprising a first annular spring plate and a second annular spring plate, wherein the first annular spring plate is clamped in the annular recess of the first housing part between the first contact surface and the second contact surface of the first housing part, and wherein the second annular spring plate is clamped in the annular recess of the second housing part between the first contact surface and the second contact surface of the second housing part; at least one clamping element, wherein each clamping element has a clamping surface which is designed to transmit a clamping and/or braking force to the object to be clamped and/or braked when a first end of one of the spring plates (1a, 1b) is supported on the first contact surface of one of the housing parts (3a, 3b) and a second end of the one of the spring plates (1a, 1b) presses on the second contact surface of the one of the housing parts (3a, 3b); wherein the spring plates (1a, 1b) are arranged within the inner space in such a way that at least one pressure space (2, 4) is formed in the inner space, which pressure space is at least partially delimited by the spring plates (1a, 1b), wherein the pressure space (2, 4) can be aerated or deaerated and can be acted on by positive pressure of a pressure medium which is suppliable to the housing, wherein the spring plates (1a, 1b) are arranged relative to the at least one pressure space (2, 4) in such a way that by aerating or deaerating the pressure space (2, 4) or acting on the pressure space (2, 4) with positive pressure, a bending of at least one of the spring plates (1a, 1b) is changeable and thereby the device changes between an open state, in which the object is spaced apart from the clamping surfaces, and a closed state, in which one or more of the clamping surfaces transmit a clamping and/or braking force to the object; characterised in that the clamping and/or braking device further comprises at least one insert plate which is arranged between the first spring plate and the second spring plate in the inner space. a housing comprising a first housing part and a second housing part, wherein each of the housing parts (3a, 3b) comprises an annular recess defining a first contact surface of the housing part (3a, 3b) and a second contact surface of the housing part (3a, 3b), and wherein the two housing parts (3a, 3b) are arranged relative to each other and fastened to each other such that the recesses of the first and second housing parts (3a, 3b) together form an inner space within the housing; a spring arranged in the inner space comprising a first annular spring plate and a second annular spring plate, wherein the first annular spring plate is clamped in the annular recess of the first housing part between the first contact surface and the second contact surface of the first housing part, and wherein the second annular spring plate is clamped in the annular recess of the second housing part between the first contact surface and the second contact surface of the second housing part; at least one clamping element, wherein each clamping element has a clamping surface which is designed to transmit a clamping and/or braking force to the object to be clamped and/or braked when a first end of one of the spring plates (1a, 1b) is supported on the first contact surface of one of the housing parts (3a, 3b) and a second end of the one of the spring plates (1a, 1b) presses on the second contact surface of the one of the housing parts (3a, 3b); wherein the spring plates (1a, 1b) are arranged within the inner space in such a way that at least one pressure space (2, 4) is formed in the inner space, which pressure space is at least partially delimited by the spring plates (1a, 1b), wherein the pressure space (2, 4) can be aerated or deaerated and can be acted on by positive pressure of a pressure medium which is suppliable to the housing, wherein the spring plates (1a, 1b) are arranged relative to the at least one pressure space (2, 4) in such a way that by aerating or deaerating the pressure space (2, 4) or acting on the pressure space (2, 4) with positive pressure, a bending of at least one of the spring plates (1a, 1b) is changeable and thereby the device changes between an open state, in which the object is spaced apart from the clamping surfaces, and a closed state, in which one or more of the clamping surfaces transmit a clamping and/or braking force to the object; characterised in that the clamping and/or braking device further comprises at least one insert plate which is arranged between the first spring plate and the second spring plate in the inner space.