When piston 1 is moved to the right by fluid entering its cylinder, V-shaped workpiece 2 is clamped by movable jaw 3 which is rigidly linked to piston rod 8. Workpiece 2 is clamped against three locating pins a of movable jaw 3 by means of two self-equalizing pins 4. The pins are equalized upon variations in workpiece diameter by means of three floating pins 5, 6 and 7 with conical ends that bear against one another. Workpiece 2 is released when piston 1 is moved to the left by spring 9.
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