How to Distinguish between Self-drilling Screws and Self-tapping Screws

Screws are one of the common fasteners, and there are many types of screws. It is difficult to distinguish the self-drilling screws and self-tapping screws. We made the following comparison to help you have a better understanding of the distinction between the self-drilling screws and self-tapping screws.

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self-drilling screws

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self-tapping screws

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.

Self-tapping screws are a kind of self-locking screws.

The self-drilling screw and the self-tapping screw are distinguished by the usage:

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 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

A self-drilling screw is a tool that uses the physical and mathematical principles of the oblique circular rotation of the object and the friction force to gradually tighten the objects and parts. 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.