So do I, but unfortunately M5 x0.5mm pitch is metric fine.
Assuming you have a lathe, how about a slightly off-beat method of making some.
I've never tried this;
Two obvious issues with threading long bar are, manually threading- the die can easily run off, and for many lathe's there's no through hole in the tailstock.
How about quickly knocking up a die holder for use in the 3/4 jaw chuck and feeding the 5mm bar in from the tailstock direction, rather than vice versa, as normal practice.
To hold the 5mm bar, maybe use a small boring bar holder on the cross slide toolpost; that way you could have just a bit protruding in the direction of the headstock, and keep re-positioning the toolpost along the bar as the job progresses.
Bill
Edited By peak4 on 18/09/2018 23:33:47