Screw M is mechanical teeth, tapping is what?
M is a mechanical tooth from the tapping is T
Self-tapping is a pointed screw for connection with no internal thread, such as plastic parts, wood parts, stone, etc.
There are many kinds of tapping teeth, such as: triangular teeth, iron teeth, wood thread, etc. Usually used TP said
Screw M is the outer diameter of the meaning, such as M5 screws, that is, the outer diameter (maximum thread diameter) of 5 mm screws
Screw M is the size of the screw, can not use the nominal judge whether the screw is a mechanical screw or self-tapping screws. Metric tapping screws are marked directly above the name Tapping Type.
