Have you ever seen a jack that can be jacked either way? It's a mechanical screw jack. We know that the hydraulic jack can't be pushed sideways with liquid in it, for fear of liquid leakage. However, the mechanical jack is a lead screw structure, which can be pushed horizontally and upside down, and is durable. The tonnage of the mechanical jack ranges from 3.2 tons to 200 tons. When selecting the jack, it depends on whether the height of the body and the lifting height meet your own requirements. There are some specifications for lifting, which are divided into standard body and short body, but their height is lower under the condition of constant load.