Hydraulic jack having a small diameter bleed part in the cylinder wall

A hydraulic jack comprising

• a cylinder having opposite ends and a cylinder wall, the cylinder wall having an interior surface and an outer surface, and the cylinder having a central longitudinal axis,
• a ram having a head portion reciprocable in the cylinder between the cylinder ends, and a rod portion partially extending through one of the opposite ends of the cylinder,
• sealing means carried on the ram head portion to provide a substantially fluid tight seal between the ram head portion and the cylinder interior surface, and
• bleed port means for permitting the flow of fluid from the cylinder when the head portion moves to a position adjacent the one of the opposite ends of the cylinder so as to prevent forcing the ram head portion and the sealing means against the one of the opposite ends of the cylinder, the bleed port means including a bore extending through the cylinder wall between the interior surface and the outer surface, and the bore having a length extending generally radially through said cylinder wall, said bore having a diameter of less than approximately 0.015 inches along substantially its entire length whereby the material forming the sealing means will not flow into said bore when said sealing means is positioned such that a portion of said sealing means is adjacent said bore.