Discussion
What is the tap size for an internal thread of M12 with 1.75?
Answer: C
The tap drill size is 10.25 mm.
For a metric thread the tap drill size is found by subtracting the pitch from the nominal diameter:
\[ \text{tap drill} = 12 - 1.75 = 10.25\ \text{mm} \]
(The standard coarse-thread drill for M12 is 10.2 mm, the nearest stock size.) 12 mm is the major diameter, which would leave no material for the thread. 13.75 mm adds the pitch instead of subtracting it. 10 mm is a rounded value that would leave too much material for the tap to cut.
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