Multiple screw threads illustrated.
Version of Friday 1 May 2020.
Dave Barber's
other pages
.
All of these screws have the same pitch.
1-start =
single-threaded
2-start =
double-threaded
3-start =
triple-threaded
4-start =
quadruple-threaded
lead = pitch
lead = 2 × pitch
lead = 3 × pitch
lead = 4 × pitch