The difference between drilling screws and self-tapping screws is mainly the shape difference, the use difference, the usage difference, etc., the specific difference is as follows:
1. Appearance difference:
The lower part of the thread of the drilling screw comes with a flat drilling tail, similar to the drill bit, the professional term is called milling tail, and the thread of the self-tapping screw does not have a drilling tail, which is an optical thread.
2. use difference:
Self-tapping screws are used for non-metallic or soft metal (such as color steel plate) and other materials with low hardness, it can be fixed on the material, by its own thread, the fixed body will be "drilled, squeezed, pressed, tapped" out of the corresponding thread, so that they are closely matched with each other. The drilling screws are mainly used for light steel structures, can drill through thin steel plates, and are widely used in steel structure factories and other buildings than self-tapping screws.
3. Differences in usage:
Self-tapping screws are often pointed, and the tail is not drilled, and a prefabricated hole must be made on the object with an electric drill and a pistol drill before being penetrated, and then self-tapping screws can be penetrated. The drilling tail screw has its own drilling tail, so there is no need to make prefabricated holes when screwing into steel plate and wood, etc. The drilling tail of the screw is equivalent to the drill bit when penetrating, and the drilling and screw penetrating are completed simultaneously.
