Self-tapping screw is not a single kind of screw, there are many self-tapping screw series, their respective characteristics and applications are not the same, the following is a brief description of two kinds of easily confused screws – self-tapping screw and drilling screw.
What is a self-tapping screw? What is a tail screw?
Self-tapping nail is a kind of threaded fastener which is used to drill out the matching negative thread in the pre-drilling of metal or non-metal material. Self-tapping screws do not require a nut with a negative thread, and they drill a negative thread on the material while they are inserted. Like triangular tooth self-tapping screws, high and low pressure self-tapping screws are self-tapping screws.
The drill tail screw is a kind of wood screw. The drill tail screw is a screw with a self-tapping drilling head at the front end of the screw, also known as a self-drilling screw. According to the different drill tail can be divided into: round head rice/cross/plum, countersunk head (flat head)/ rice/cross/plum, hexagonal division, round head Chinese division (big flat head), horn head, etc.
In fact, the two are still very related, “self-drilling screw” must be “self-drilling screw”, referred to as “self-drilling screw”, because there is a drill tail, so it is also called “drilling screw”, and self-tapping screw is not necessarily self-tapping screw, usually we say that the self-tapping screw is the need to preform the hole of the self-tapping screw.
Common points of self-tapping and drilling screws
The nail body is threaded and self-tapping.
The difference between self-tapping screw and drilling screw
1, the difference in use: self-tapping screws for non-metal or soft metal (such as color steel plate) and other materials with low hardness, it can be fixed on the material, relying on its own thread, will be fixed “drilling, extrusion, pressure, tapping” out of the corresponding thread, so that each other closely. And the drill tail screw is mainly used for steel structure of color steel tile fixed, thin plate fixed, etc.
2. The difference in usage: the corresponding internal thread is formed by extrusion when the self-tapping screw is inserted. No drilling, tapping, complete operation, but not recommended multiple drilling, easy to damage the drilling or the phenomenon of sliding wire. When the drilling screw is used, it does not need auxiliary processing, and can be directly drilled on the material, tapping, locking, etc. to complete the operation at one time, greatly saving the installation time.
3, the difference in the shape: self-tapping screws are generally pointed, thick teeth, hard texture, with a certain taper, so that they can “self-tapping”, but can not drill, and the head of the tail screw thread has a drill bit that can drill.
