View Catalog Page The Type 68 Series allows a driving diameter of 4.66 inch to 5.74 inch. This design is generally used in medium roughing operations and can handle loads of up to 3,000 Ibs. The pressure equalization of the driving pins is provided by hydraulic fluid. This permits a seven-degree pitch on the end face of the part. Behind every driving pin is a sealed piston that prevents oil leakage. The oil cavities behind the pistons are interconnected and the whole system is enclosed. This series is available in a taper shank, chuck or flange mount. The flange mount is preferred due to higher stability and increased concentricity capabilities. When using a flange mount design, a spindle adapter and mounting screws are required. The flange mount results in less wear on the machine and machine spindle. The taper shank and chuck mount allow for the face driver to be changed quickly when using the machine for other applications.