1/4" to 9" round capacity

Double Acting Self-Centering Vise

View Self-Centering Vises service parts (.pdf file)
 

Heinrich Self-Centering Air Vises automatically center in this manner:

Each of two opposing jaws is actuated directly by a double-acting piston type air cylinder on both sides of the vise. Jaws are mounted on hardened and ground parallel bars to maintain accurate jaw alignment. The jaws are connected by a gear and rack assembly concealed in the vise base so that they move together equally on both sides of the center, within an accuracy of .001". This mechanism is fully protected from dirt, chips and coolant. No pressure is transmitted through the centering device, which serves only to guarantee uniformity of jaw travel. Double acting air cylinders provide full travel of the jaw opening and return of the jaws under air pressure. The amount of jaw return may be regulated by adjusting the length of the threaded stop rods attached to the back of each jaw. The rods stop against the vise body casting when the jaws are in the opening position.