Threads are cut on a lathe with a single point tool by making a series of cuts in the same cut.
Square threads are used for transmitting motion or power. Eg. screw jack, vice handles, cross-slide and compound slide, activating screwed shafts.
In a threaded assembly the contact between the male and female threads takes place on the Flank
The distance from a given point on one thread to a corresponding point on the next thread is called Pitch