Only the newer rimset shutters are standardised, Copal, Compur, Prontor, Seiko, Epsilo, Trikom, AGI, Vario, possibly some others. Epsilon & Trikon are only size #0.
Originally Posted by ntenny
Thjere are some exceptions - shutters made for certain folding cameras, I have some Prontors that are #0 fit, same 0 threads for the front elements but smaller possibly #00 I've not checked rear elemnts - these don't have ashutter releason the side it's on the rear to connect to a lever.
I have all the shutters liosted, aperture scales can't be transferred from one make to another though.