Thread sizes? Corny Post

[aamcle]

Evening All

I think I have a US thread on a Corny post would you please look it over?

The sizes are :-
Measurements.

I have found the nut.
Nut on long thread 0.742 inch. 19.05 mm flat to flat
Thread outer diameter 0.502 inch. 12.68 mm
Thread peak to peak 0.059 inch 1.33 mm both approximate.

I think it's some sort of 1/2 inch US standard.

Thanks All. Aamcle

 

[aamcle]

I forgot to mention I bought it from China.