Spiral jacks and hydraulic jacks are common vehicle lifting tools, but overall, spiral jacks have more advantages in vehicle lifting operations, especially in their excellent self-locking ability.

The screw jack is mainly composed of components such as screw, handle, base, sleeve, and gear, with clear division of labor and tight coordination among each component. When the operator shakes the handle, the screw drives the sleeve to rise, thereby achieving the lifting of the heavy object. At the same time, the internal threaded structure can achieve mechanical self-locking at any height, and even if the external force disappears, the sleeve will not slide down on its own, so it can support heavy objects for a long time and stably, which is very suitable for scenarios where lifting operations need to be paused halfway.

Hydraulic jacks work based on Pascal's principle, and their lifting function is similar to that of screw jacks. But as a tool driven by a hydraulic system, its power comes from hydraulic oil, and its performance largely depends on the quality of the oil, the adequacy of the oil volume, and the sealing of the system. In practical use, if the quality of hydraulic oil is poor, the oil volume is insufficient, or the seals are aging, it is easy to encounter problems such as weak lifting or natural sliding of the lifting sleeve, which affects the safety and reliability of operation.

In summary, the screw jack, with its reliable mechanical self-locking structure, is significantly superior to the hydraulic jack in terms of support stability, especially suitable for working conditions that require long-term maintenance of the lifting state or suspension of operations, making it more in line with the actual needs of vehicle lifting operations.