Thread pitch is measured by number
of threads per inch or mm
No mater the diameter, the size of
the pitch is always the same. For instance you can have a
632 thread, 6 being the diameter (threads under 1/4"
diameter are called out by numbers i.e.: 2, 4, 6, 8, 10 etc.)
and 32 being how many threads per inch. So a 632 thread is
the same size in height as a 1/2"32 or on a 1"32
In Metric, pitch and size by millimeter. So a common screw
on a model engine is 3x.5 , 3 mm diameter and .5 pitch, so
have a thread per mm.
In other words for inches a 32 pitch thread would take 32
turns to move 1 inch. In metric a .5 pitch would take 2 turns
to move 1 millimeter.
