Why are nuts usually made of hexagons?

As we all know, threaded fasteners generally fasten parts. The location and size of the assembly are often limited by space, that is, the assembly space is small. In the case of insufficient space, use a wrench to tighten the nut, and the angle of a single rotation is obviously as small as possible.

Assuming that the nut has n sides, the angle of each wrench rotation is 360/n degrees, so the number of sides increases and the rotation angle decreases, which is conducive to operation.

But in practice, blindly increasing the number of sides will reduce the contact area between the wrench and the nut, making it easier to slip. After continuously absorbing experience, the predecessors choose more hex nuts that are easy to operate (only 60 degrees at a time, compared to 90 degrees at the four corners) and not easy to slip.

In reality, of course, there are non-hex nuts.