What is the difference between self-drilling screw, self-drilling screw and self-tapping screw?
2019-08-02 14:49:36
The difference between self-drilling screw, self-drilling screw, self-tapping screw and self-tapping self-drilling screw:
First of all, the same products can be divided into two categories:
.
1. Drilling tail screw = self-drilling screw = self-tapping self-drilling screw < br />.
2. Self tapping screw
The first kind of screw has its own drill tail, when it is screwed into steel plate and wood, no prefabricated holes are needed. The drill tail at the end of the screw is equivalent to the drill bit when it is tapped. The second kind of screw is usually the tip when drilling and tapping synchronously. There is no drill tail at the end. Before tapping, a prefabricated hole on the object needs to be drilled with an electric drill and a pistol, and then the screw. Can attack. As for the head type and the difference between the two kinds of screw is not related, because the two kinds of screw have hexagonal head, disk head, countersunk head and other head types, and the groove is generally used most of the cross and square groove, but there are also very few hexagons.
Explain again the difference between the names of self-drilling and self-drilling. Self-tapping: No prefabricated threaded holes are needed. When tapping, the screw automatically extrudes with the object to form matching threads. It is different from the mechanical threads when the screw is screwed into prefabricated threaded holes. Self-drilling screw and self-tapping screw have this characteristic. Self-drilling: There is no need for any prefabricated holes when tapping. The screw drills holes by itself. This feature is only available for self-drilling screw. So “ self-drilling screw ” must be “ self-tapping self-drilling screw ”, abbreviated as “ self-drilling screw ”, because there is a drilling tail, it is also called “ drilling tail screw ”, and self-tapping screw is not necessarily self-tapping self-drilling screw, usually we refer to self-tapping screw with prefabricated holes.
