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Product Description Up and down without obstacles: Special treatment of piston to prolong service life Fast Connector + Plastic Dust-proof Cover: The joint adopts threaded ZG3/8 fast joint, thread locking and compact structure. This hollow hydraulic cylinder is often used in power, chemical, steel, bridge, machinery and other industries, not for the CAR. (1). when several hydraulic jacks work at the same time, they should be directed by someone to make the lifting or falling simultaneously. Two adjacent hydraulic jacks shall be supported with wooden blocks to ensure that the gap is secured against sliding. (2). when using hydraulic jack, always pay attention to the sealing part and pipe joint part, and must ensure its safety and reliability. (3). hydraulic jacks are not suitable for sites where acids, alkalis, or corrosive gases are applied. Important Note: After pressure relief, the jack piston can not retract itself!! The jack can only retract with the help of heavy gravity, and it's not the quality problem. Note: In order to operate correctly, all cylinders need to be connected to a solid lifting surface. The use of cylinders on sandy, clay or loose surfaces can lead to cylinder damage. Technical Parameter Model: FPY-10D; Tonnage: 10T ; Stroke 1: 13MM; Stroke 2: 13MM; Stroke 3: / ;Total stroke: 26MM Oil storage capacity: 22CC; Self height: 51MM; Weight: 1.6kg; Compression area: 11.3mm² Inner diameter 1: 28mm; Inner diameter 2: 38mm; Inner diameter 3: / ; External diameter: 66x83mm If you have any problems, please send emails to us freely.