The hydraulic cylinder inside the hydraulic jack is the energy field of the jack, with a sturdy metal shell that can pressurize the hydraulic pressure to 650 kilograms per square centimeter.

When producing hydraulic cylinders, workers first use computer-controlled drill bits to drill channels for hydraulic oil flow on steel blocks, and then use super strong metal balls to support the huge hydraulic pressure inside. Metal balls are the key to sealing the hydraulic cylinder. Workers need to first check for debris in the channels, then put the metal balls in and hit the rocks, and then firmly seal it. Next, workers start building the hydraulic cylinder on the base, first placing the L-shaped sealing ring on the base, and then placing the cylinder on the base to prevent oil leakage. Then, they use a machine to cover the nut surface, tighten the sliding sleeve of the hydraulic cylinder with a large torque, and the engine below will rotate the base to rotate the nut into place.

The above is the manufacturing process of hydraulic jacks and hydraulic cylinders. From this, we can find that the sealing degree and manufacturing quality of the cylinder are crucial to whether the jack will experience oil leakage during future use. This is why hydraulic cylinders are high-precision components.