Why are the screws all hexagonal?

6 side-shaped screw 60 degrees can be a graphic restore (do not know the expression clearly, see the explanation in the discussion))

If the space is relatively small, as long as the wrench can be screwed 60 degrees can be installed on the screw

This is the product of a compromise between the twist angle and the side length.

Imagine

If it is a square, the side length is long enough, but to twist 90 degrees to restore the graphics, not suitable for small space installation

If it is an octagon or 10-edged shape, the angle of the image reduction is small, but the side length of the force is also small, easy to grind round

If it is the singular side length of the screws, then the wrench two side is not parallel, very early only fork wrench, singular side long wrench head is a horn-shaped openings, it seems not suitable for exerting force

Other than that

You have to look at the head and handle of the wrench also has an angle

If the space is smaller, turn the wrench upside down.

It seems like only 40 degrees of space can screw the screws.

But now there's a socket wrench, a plum wrench.

The minimum twist angle can be 15 degrees.

Why are the screws all hexagonal?