What is the difference between a screw and a bolt?

Screws and bolts are functionally connected and fastened. The biggest difference is that the screw connection needs to be tapped on the connected part to form a threaded hole, which is generally used between the thinner part and the thicker part. connection. The bolts need to be used with the nut. Only the light holes are needed on the connecting parts. Generally, the two parts are used when the thickness of the joints is similar. As for the shape of the head, the head of the bolt is generally flat, and the head of the screw has many forms depending on the application.