CD screw is considered a deep knowledge in the international arena. The examples of secure screws used for each type of data are different, but there are also some basic rules:

1. There are three types of screw pitch: machine teeth, plastic screws, wood screws or wall screws. The screw pitch is importantly related to the density of the locked data. The greater the data density, the smaller the pitch.
1. Coarse teeth in machine teeth refer to standard screws used in every place; fine teeth can have different pitches according to different needs, and also refer to non-standard screws, which are used in special occasions.

2. The pitch of the plastic screws can also be different. For example, the pitch of soft materials such as PP and PE can be increased, so that the teeth are not easy to slip; and the denser materials such as POM and PC can use screws with a smaller pitch.

2. There are many types of CD pattern screw head type and groove type, which are usually different according to the surface and tamper-proof, or other needs. This is more intuitive.

3. The appearance of the screw tail is complicated and complicated. It is nothing but the common controls we use are flat tail, pointed tail, grooved, triangle, cone, etc. These shapes have several important results: positioning, tin transfer, self-tapping, self-locking and other functions. According to the function, you can choose different tail demands.

Four, self-tapping screws are divided into two major applications: plastic and hardware.
1. Plastics adopt self-tapping in every state, but some non-special demand places are outside. But pay attention to different plastic applications with CD pattern screws with different pitch and tail shape. There are some special heat and stress conditions, so you need to pay special attention.

2. Hardware self-tapping usually adopts triangular screws. The pitch is the same as machine screws. The triangular screws have the characteristics of self-locking and self-tapping, but they cannot be disassembled and assembled repeated.