24 threads per inch
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6.3
Screw Pitch is defined as the axial distance between threads. One complete revolution of the screw will move it into an object the distance of the pitch. The smaller the pitch, the greater the mechanical advantage (ability to do work) achieved.
pitch = 1/Threads per Inch So for a 1/2 - 20 thread the pitch is .1
6 is the diameter of the shaft and 32 is the number of threads it has per inch.
The pitch is the axial distance between threads, and the distance the thread moves with a 360 degree revolution. So if the pitch of a screw is 1mm, one revolution will move it 1mm farther down.