I am using Fusion 360 to design things for 3D printing, and I am thinking about attachments that might screw onto the top of a milk bottle, say a plant watering spout, if I could just work out the thread specs for this.

There are specs all over the net for standard softdrink and water bottles, does anybody have info on the milk bottle?

I'm gonna rough up something and see how it fits but it would be good to know the exact dimensions (refusing to use both my glasses and my micrometer at the same time, cos that would take the fun out of it all).