Jergens Double Acting Cylinders can be used for clamping, holding, positioning, staking, punching, or anywhere that a heavy-duty cylinder is needed. If the cylinder is mounted in the fixture (as opposed to using mounting brackets), the fixture should be bored to between 0.0005″ and 0.0010″ over the “A” dimension. Doing so will prevent an out-of-round condition of the cylinder body, which could damage the piston. They may be returned by air or by hydraulic pressure.