The disclosure relates to an annular elastic element for a clamping and/or braking device, the element comprising: an annular spring plate, wherein the annular spring plate has a first annular side surface and a second annular side surface; a sealing element, wherein the sealing element is arranged on the second side surface of the spring plate, and wherein the sealing element forms an inner projection in a region of an inner edge of the annular spring plate and forms an outer projection in a region of an outer edge of the annular spring plate; wherein the inner and/or outer projection of the sealing element each forms a bulge at least in sections. The disclosure further relates to a housing part for a pneumatic clamping and/or braking device and to a pneumatic clamping and/or braking device having such an annular elastic element.

Device for clamping and/or braking an object to be clamped and/or braked, comprising a housing; a spring arranged in the housing comprising a first and a second annular spring plate, wherein the annular spring plates are clamped in the housing between first and second contact surfaces of the housing; at least one clamping element having a clamping surface which is designed to transmit a clamping and/or braking force to the object; wherein the spring plates are arranged within the housing in such a way that at least one pressure space is formed, which can be ventilated or vented, wherein by ventilating or venting the pressure space, a bending of at least one of the spring plates can be changed and thereby the device changes between an open state and a closed state; wherein the device further comprises at least one insert plate, which is arranged between the spring plates.