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Tapping screws are tapping hole drilling as chipless screw, and general different, the head is sharp, the pitch is relatively large, and no dust silk attack a bit like, can not directly enter the tapping screws, metal and plastic often use this method.

Self tapping screws, nuts, no..

It can integrate material in its own thread, and the body will integrate, attack, drill, squeeze, press, "give the appropriate thread, and cooperate closely with each other.".

Self tapping screws are generally manual operation, because of human limitations, this screw is generally smaller, narrow range of use.

Tapping screws from its name can be understood by tapping your own screws. The universal screw must screw the hole in it. Self tapping screws are not necessary while taking advantage of the screws in his place.

In order to achieve the goal, his attack, the screws are generally not sharp, easy to enter into the object. The ordinary screw is flat and the thickness is the same.