Compared with metric bolts with a tooth angle of 60°, self-tapping screws needs to tap the thread in plastic and ensure the connection strength. The tooth angle is generally 30°, as shown in Figure 2 Commonly used sizes are: 2mm-7mm, namely TP2, TP3, TP4, TP5, TP6, TP7, etc. Suppose the diameter of the screw is d.
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