What advantage does a square screw thread have over a V-thread?

A square screw thread is engineered to offer better load-bearing capabilities by providing a larger surface area in contact with the nut or the material it's engaging with. This configuration allows it to distribute forces more evenly, which means it can withstand higher loads without experiencing as much friction compared to a V-thread.

The design of a V-thread, while effective for many applications, has a sharper angle that leads to increased friction as it is loaded. In contrast, the square thread minimizes this friction by having a flat top and bottom, which allows the thread to move more smoothly against a corresponding surface. This reduction in friction not only facilitates easier movement but also enhances the overall mechanical efficiency of the joint.

As a result, square screw threads are often preferred in scenarios where high forces are involved, providing strength and ease of use while minimizing wear on both the screw and the nut.