The screw jack has strong lifting capacity and also has a relatively strong load-bearing capacity. As a rigid lifting component, we can only manually shake the screw to increase pressure on the threads of the jack from the outside to the inside. After the threads transmit force to each other, we can achieve the purpose of lifting heavy objects.

The screw is the only medium connecting the operator and the jack body. Without the screw, although we can use the ratchet set to rotate the nut sleeve, it is time-consuming and laborious. It can be said that the screw is like our extended arm, making our work more effortless.

However, the load-bearing capacity of screw jacks varies from a few tons to one hundred tons, and the length and thickness of the screws used in these different specifications and models of jacks are naturally different. Its main dimensions are determined through theoretical calculations, while other structural dimensions are determined based on empirical formulas or manufacturing processes. Strength verification is only carried out when necessary. The screw material commonly used is Q235 Q275、 40, 45, 55, etc., 45 steel is more common.