A bone cement applicator for providing a bone cement, in particular a polymethyl methacrylate bone cement, the bone cement applicator having a cartridge with a cylindrical interior , a cartridge head with a delivery opening for discharging the bone cement, wherein the cartridge head closes the cylindrical interior of the cartridge at a front side of the cartridge except for the delivery opening , a mixing member which is movably arranged in the cylindrical interior of the cartridge and is movable in the interior with a mixing rod guided into the interior , a delivery plunger which is arranged in the cartridge and is mounted pressably in the direction of the delivery opening in the cylindrical interior of the cartridge , wherein the delivery plunger has an outer cylindrical circumferential surface and wherein the delivery plunger rests at least in places with its outer cylindrical circumferential surface against an inner wall of the cartridge , said inner wall defining the cylindrical interior , characterized in that the bone cement applicator further having at least one clamping element which is arranged in the region of a back side, opposite the front side of the cartridge , of the cylindrical interior on the inner wall of the cartridge , said inner wall defining the cylindrical interior , wherein the at least one clamping element projects out from the inner wall of the cartridge in the direction of the cylindrical interior , wherein the cylindrical circumferential surface of the delivery plunger is at least in places resiliently deformable by the at least one clamping element in the direction of a central cylinder axis of the cylindrical interior , such that the delivery plunger is clampable in place with the at least one clamping element on the back side of the cartridge . a cartridge with a cylindrical interior , a cartridge head with a delivery opening for discharging the bone cement, wherein the cartridge head closes the cylindrical interior of the cartridge at a front side of the cartridge except for the delivery opening , a mixing member which is movably arranged in the cylindrical interior of the cartridge and is movable in the interior with a mixing rod guided into the interior , a delivery plunger which is arranged in the cartridge and is mounted pressably in the direction of the delivery opening in the cylindrical interior of the cartridge , wherein the delivery plunger has an outer cylindrical circumferential surface and wherein the delivery plunger rests at least in places with its outer cylindrical circumferential surface against an inner wall of the cartridge , said inner wall defining the cylindrical interior , characterized in that the bone cement applicator further having at least one clamping element which is arranged in the region of a back side, opposite the front side of the cartridge , of the cylindrical interior on the inner wall of the cartridge , said inner wall defining the cylindrical interior , wherein the at least one clamping element projects out from the inner wall of the cartridge in the direction of the cylindrical interior , wherein the cylindrical circumferential surface of the delivery plunger is at least in places resiliently deformable by the at least one clamping element in the direction of a central cylinder axis of the cylindrical interior , such that the delivery plunger is clampable in place with the at least one clamping element on the back side of the cartridge . <EOS>