Which of the following is the most important to how well a t

Which of the following is the most important to how well a threaded shaft fits a threaded hole? That is, what controls how tightly the surfaces of the mating threads themselves?

a. Crest

b. Root

c. Major Diameter

d. Pitch Diameter

Which letter choice is it?

Solution

a) crest-The surface of the thread that joins the flanks of the thread and is farthest from the cylinder or cone
from which the thread projects. The crest of an external thread is at its major diameter while the crest of an internal thread is at its minor diameter.