Correct option is A
A
chamfer tap is a general term for taps with threads at the front end that are
partially cut away and relieved at the crest of the first few teeth.
This modification allows for
easier starting by distributing the cutting load across multiple teeth as the threads are formed.
· If the chamfer extends
7 to 10 threads, it is called a
taper tap.
· If the chamfer extends
3 to 5 threads, it is called a
plug tap.
· If the chamfer extends
1 to 2 threads, it is called a
bottoming tap.
