Originally Posted by cncwhiz  We have a part that we need to make a 4 3/8" male and female thread. The handbook does not go that big? |
As already stated, find a thread size with the correct pitch you need. Add/subtract the difference. Size of thread doesn't matter. Thread height will always be the same for a given pitch/lead regardless of the size. A 1/4-20, 1/2-20, 1-20, 4-3/8-20, etc. all have the same thread height. This works for major/minor/pitch diameters.