Modeling Screw caps for bottles

Does anyone have any info on how to do this? (the joining threaded part)
Im finding it suprisingly hard to find any information on how they should be constructed.

Thank you All.

Hi Simon - is your question about the design of the thread- pitches and angles and profiles and such for real parts, or about how to make the surfaces once that is known?


Hi Pascal.
Its the design of the thread, I cant find any information anywhere, and thought one of the product designers on here would know where I could look.

Hi Simon,

Is any help?

Thank you Jeremy. I will have a look.

this video might help

Amazing Video! Thank you.
Some realy good curve tools used too.