I'm sure someone will confirm the pitch. But you could buy a bolt? Or take your MT4 along to somewhere that sells studding or bolts and check it out? Agri dealers, ironmonger/hardware stores, building suppliers all come to mind as possibles. I'll see if I can hunt out a bolt tomorrow, and try it, if nobody else responds.

Assuming that you are asking as you want to make a drawbar, go to somewhere selling studding, find a bit that fits, and buy a length, cut off what you need. For a slightly posher version, buy stainless studding. No need for any exotic steel for a MT drawbar, you do not need a very high retaining force, it would just make the taper stick.

Oops! Sorry, I wasn't thinking properly last night. Both my MT4 taper fittings are reducing sleeves, so no thread needed and no thread present.

Edited to add that it might be imperial if the tooling is old (5/8 Whitworth thread?).

Edited By not done it yet on 13/07/2017 16:05:18

Checking the pitch for something as large as M16 is not a problem, just put a piece of paper in the hole and press it against the threads with your finger. Remove the paper and measure the pitch of the marks on the paper.

Martin C