Screw Covid I’m going to Sturgis 2020 shirt

A screw is a combination of simple machines it is, in essence, an inclined plane wrapped around a central shaft, but the inclined plane thread also comes to a sharp edge around the outside, which acts a wedge as it pushes into the fastened material, and the shaft and helix also form a wedge in the form of the point. Some screw threads are designed to mate with a complementary thread, known as a female thread internal thread, often in the form of a nut, or object that has the internal thread formed into it.