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

Screws are one of the common fasteners, and there are many types of screws, among which it is difficult to distinguish between drilling screws and self-tapping screws. In order to prevent fakes from being bought, the editor of Haoyue Quan Hardware compares the drilling screws and self-tapping screws as follows to distinguish them from each other.

First, the categories are distinguished:

Drilling screws are a kind of wood screws, and self-tapping screws are a kind of self-locking screws.

Threaded Drilling Screw with Pad

Second, the head type is distinguished:

Drilling screw head types are: hexagonal head, hexagonal flange head, cross countersunk head, cross pan head

The head types of self-tapping screws are: cross countersunk head, cross pan head, hexagonal head, cross half countersunk head, etc.

Hexagon head galvanized self-tapping screws

Three, use to distinguish:

Drilling screws are mainly used for fixing steel structure color steel tiles, thin plates, etc. The main feature is that the tail is drilled or pointed. When in use, operations such as drilling, tapping, and locking can be completed directly on the material without auxiliary processing, which greatly saves installation time.

Self-tapping screws have higher hardness and can also be applied to some materials with higher hardness, such as iron plates. Low tightening torque and high locking performance.

Hardened hexagon flange drill end screw

Fourth, distinguish in terms of performance:

The drill tail screw is a tool that uses the physical and mathematical principles of the circular rotation and friction of the inclined surface of the object to gradually tighten the parts of the object. Drilling screws are screws with a self-tapping bit at the front of the screw.

Self-tapping screws are mainly used for the connection between thin metal plates (steel plates, saw boards, etc.). When connecting, first make a threaded bottom hole for the connected part, and then screw the self-tapping screw into the threaded bottom hole of the connected part.