thread pitch, they even make guages for these, there always included in a tap and die set but you could likely find one at a hardware or automotive store
when lead of the screw is equal to the pitch it is called single threaded screw
Screws have three main dimensions: diameter, length, and thread pitch. The diameter is the measurement across the screw shaft, the length is how long the screw is, and the thread pitch is the distance between each thread on the screw. These dimensions determine the size and compatibility of the screw for different applications.
The angle of a thread of a screw is an angle between the threads and it is the defining factor for the shape of the screw thread.
The distance between two threads in a screw is called the pitch. It is the measurement of how far the screw advances with one complete turn.
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.
Crest
It is called simply "threads per length" . In US it is threads per inch. It is the reciprocal of the pitch. For example a screw with 32 threads per inch has a pitch of 1/32 inch. The pitch is distance between threads
when a spiral groove is cut over a hole, then it is nut thread. when a spiral groove is cut over a shaft, then it is screw thread.
Pitch is the distance from the crest of one thread to the next. the displacement of the circular scale due to a complete rotation of the screw, along the main scale is called screw pitch..
A screw operates by a raised ledge which proceeds up the shaft of the screw in a spiral. This raised ledge is called the thread of the screw. Since the spiral can either proceed in a clockwise or counterclockwise manner, we distinguish between right-hand thread screws (counterclockwise as viewed from above) and left-hand thread screws (clockwise).
The pitch of a screw thread is a measure of how closely the threads are spaced. It can be expressed as the number of threads per unit length (32 threads per inch, for example) or as the distance between two threads ( such as .8 mm).
Thread