Clamp with rotatable advancement apparatus

A clamp is provided, said clamp comprising a clamp bar (16), a fixed jaw (12) which is located at the clamp bar (16), a counter jaw (14) relative to which the clamp bar (16) is displaceable, an advancement apparatus (18) on which the clamp bar (16) is displaceably supported and to which the counter jaw (14) is connected in translationally fixed relation, an actuating device (54) which is arranged at the advancement apparatus (18) and by way of which displacement of the clamp bar (16) in an advance direction (90) is actuatable, and a blocking apparatus (20) by way of which displacement of the clamp bar (16) in a counter direction (138) to the advance direction (90) can be blocked, wherein the actuating device (54) is rotatable relative to the clamp bar (16) and is rotatable relative to the blocking apparatus (20), and wherein the blocking apparatus (20) is rotationally fixed relative to the clamp bar (16).