Technical Dynamo nut size

[JonPiz]

Im trying to find the size of the nuts that go on both ends of the dynamo holding the fan and the pulley on. Ive tried M10 fine but the thread is wrong. Any help please?

 

[bugsymike]

Im trying to find the size of the nuts that go on both ends of the dynamo holding the fan and the pulley on. Ive tried M10 fine but the thread is wrong. Any help please?

Around our way there are companies like "the screw shop" that can supply/match any size and thread you bring to them.
We also have a company supplying taps and dies for odd sizes also, though I understand not required in your case.
Metric threads come in many dimensions 1,1.25, 1.5, 1.75 to the ?(cm , inch ? ) You can go online to compare/check what thread you have.
Another thing I have found is often another nut/bolt on surrounding parts will have a similar thread for you to check with.

 

[Toshi 975]

Is it definitely a Dynamo you are working with and not an alternator as the latter has an M12 fine thread at the fan end.

 

[JonPiz]

Is it definitely a Dynamo you are working with and not an alternator as the latter has an M12 fine thread at the fan end.

Def a dynamo. It’s an M10 thread but not sure the pitch

 

[Toshi 975]

I can confirm that the nut is M10 fine or M10 x 1.25 pitch.

 

[JonPiz]

I can confirm that the nut is M10 fine or M10 x 1.25 pitch.

Thank you