There are a gaggle of odd ball threads it might be, it's close to an M4 x 0.75 (M 0.75 corresponds to 33 3/4 tpi) which isn't a common thread either!
Here's the chart I find useful:
Which is contained in a really neat collection of tech references:
Lacking a die, a thread restoring file is nice for final clean up of single point cut threads.
Roy
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--- In 7x12minilathe@..., "nps0" <w6nim@...> wrote:
I need to shorten a couple of gun cleaning rods. Found that the thread was an odd one - 32 tpi (no problem with this) but the OD is 0.153, which falls between 6-32 and 8-32. Machinery's Handbook doesn't list a 7xanything thread. IS there a #7 machine screw size? I guess that's why we have lathes - but a die would be nice to clean up the threads.
Norm
