How to distinguish between self-tapping screws and self-drilling screws?

Screws are one of the common fasteners, and there are many types of screws. Their respective characteristics and applications are not the same, and they are not easy to distinguish. The following is a brief description of their distinguishing methods:

The self-drilling screw and the self-tapping screw are distinguished by the material:
The self-drilling screw belongs to a kind of wood screw. The tail of the self-drilling screw is tail-drilling or sharp-tailed. It can be drilled, tapped and locked directly on the set material and base material without auxiliary processing, which greatly saves construction time. Compared with ordinary screws, its toughness and holding force are high, and it will not be loose after a long time after combination. It is easy to complete the operation by using safety punching and tapping at one time.
Self-tapping screws, also called quick-thread screws, are a kind of self-locking screws. It is a quick-installed fastener made of steel with a passivated surface galvanized. Self-tapping screws are mostly used for the connection between thin metal plates (steel plates, saw plates, etc.).

The use of self-drilling screws and self-tapping screws to distinguish:
The self-drilling screw is mainly used for fixing the color steel tile of the steel structure and fixing the thin plate. The main feature is that the tail is drilled or pointed. When in use, there is no need for auxiliary processing, and the drilling, tapping, and locking can be done directly on the material at one time, which greatly saves the installation time.
Self-tapping screws have high hardness and can also be used on some materials with high hardness, such as iron plates. It has low screwing torque and high locking performance.

Self-drilling screws and self-tapping screws are distinguished in terms of performance:
The self-drilling screw is a tool that uses the physics and mathematics principles of the oblique circular rotation of the object and the friction force to gradually tighten the objects. A self-drilling screw is a screw with a self-tapping drill head at the front of the screw.
Self-tapping screws are mostly used for the connection between thin metal plates (steel plates, saw plates, etc.). When connecting, first make a threaded bottom hole for the connected piece, and then screw the self-tapping screw into the threaded bottom hole of the connected piece.
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