What is the formula used to calculate blank size of round rod before cutting external thread?

A. Blank size=Thread size -0.1% pitch of the thread

B. Blank size=Thread size +0.1% pitch of the thread

C. Blank size=Thread size -0.01% pitch of the thread

D. Blank size=Thread size +0.01% pitch of the thread

Correct Answer: Blank size=Thread size -0.1% pitch of the thread