The screw jack is driven by human power to rotate the screw, using a spiral mechanism to linearly lift heavy objects. This tool is structurally optimized for vertical operation, and its self-locking feature prevents reverse movement under gravity, ensuring the stability and safety of the load. Therefore, screw jacks are usually not suitable for horizontal tension or thrust applications.

The basic design of a screw jack includes a fixed base and a lifting screw that rotates through a handle. When the handle rotates, the lifting screw rotates inside the fixed nut, and due to the action of the screw mechanism, this rotation is converted into a linear motion of the lifting screw along the axis of the nut. This structural configuration is designed to optimize the efficiency of vertical force transmission, not horizontal force. The self-locking effect in a screw jack is achieved through thread friction between the lifting screw and the built-in nut. This design ensures that the load will not drop on its own due to gravity or other external forces without an additional locking mechanism. This feature is necessary, especially in scenarios with high safety requirements, such as car maintenance or heavy equipment installation. However, this self-locking function is only effective under vertical loads and cannot provide the same protective effect under horizontal loads. Spiral jacks are usually equipped with anti slip bases and stable support structures, which are designed to disperse and withstand the vertical downward force from the lifting screw. Using a screw jack in the horizontal direction may cause the tool to slide or tip over due to a lack of proper support, thereby reducing the safety and effectiveness of the operation.

Although screw jacks can be used horizontally, there are also certain risks involved. The design of the screw jack is for vertical use. We hope that everyone can use it vertically as much as possible to ensure the safe operation of the jack.