Figure $5-3$

The # of threads $=$ Thread Depth $($length$)$ TPI $($threads per inch$)$ or Thread depth $$ Pitch

Where Pitch $=\frac{1}{\frac{T}{P}\text{I}},$ The lead is the distance a threaded part will travel in $1$ full rotation and is equal to

Lead $=1$ pitch if it is a $1$ start thread, $2$ pitch if it is a $2$ start thread, $3$ pitch if it is a $3$ start thread, $4$

pitch if a $4$ start thread.

If Hole B was a $2$ start thread how far would it travel in $2$ full rotations?