Single Point Thread Mills

[magicniner]

I have a range of metric and imperial thread mills for specific jobs but for oddball OD and for internal stuff down to about 11mm I use one of these -

http://www.iscar.com/eCatalog/Item.a...FSTYP=M&srch=1

With a threading tip, there are a range of tips for other purposes -

http://www.iscar.com/eCatalog/Family...geType=4&rel=I

If you can get a good deal on a thread mill that has a few teeth on a decent length shank you can grind it down to one fairly easily and cut a range of threads with it, keep in mind that if you move too far from the intended diameter for ID cutters the thread form can come out slightly off,

- Nick