Spiral jacks help adjust the position of the hull through their mechanical properties, specifically by relying on the self-locking effect of threads to support and lift heavy objects. During ship maintenance or repair, this type of jack can steadily lift the ship to the required height, allowing personnel to perform necessary inspections, repairs, or painting work.

When adjusting the position of the ship, the screw jack needs to be kept vertical during use to prevent the screw from tilting and bending, ensuring the stability and safety of the ship lifting. Due to its simple structure and self-locking function, the screw jack can stably support the hull after it is adjusted to the appropriate position, providing convenience for subsequent operations. The use of screw jacks is relatively flexible, and the angle and position of the ship can be adjusted according to needs, making painting or other maintenance work more uniform and efficient. Before using a screw jack, necessary checks and adjustments should be made to ensure that all components of the jack are in good condition to ensure safe operation. Although the transmission efficiency of the screw jack is relatively low and the return is slow, it provides stable support, which is an important advantage for precise adjustment of the ship's position.

The screw jack provides a stable and reliable method for adjusting the position of the ship through its simple structure and self-locking function, thus playing an important role in ship repair and maintenance work.