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The cone-shaped part of the tap tip is called " external center ".
This part is attached during the manufacture of taps and is not used during threading.
The presence or absence of external center is determined by the type of tap and the range of size .
straight fluted tap ：M1~M6
spiral pointed tap ：M1~M9
spiral fluted tap ：M3.5~M6
A: Extrusion center
B: chamfer
C: Fully threaded part
D: Thread length
E: overall length
F: Shank diameter
G: Square part
* The above catalog is posted as an example.
If you would like to check the availability of external center in your desired size, please refer to the " external center " column from the size list in the catalog.
In addition, it is not processed in the external center part, but it is necessary to consider the depth of the tap pilot hole.