At the top of a bottle of pop, there is a corkscrew pattern into which the plastic cap is twisted, tightened and sealed.
What is the name of this feature of the bottle?
English Language & Usage Stack Exchange is a question and answer site for linguists, etymologists, and serious English language enthusiasts. It only takes a minute to sign up.
Sign up to join this communityAt the top of a bottle of pop, there is a corkscrew pattern into which the plastic cap is twisted, tightened and sealed.
What is the name of this feature of the bottle?
It depends on exactly what part of the bottle top you mean. If you mean the top part of the bottle having a spiraling bit on it, that is called the finish, specifically an external threaded finish. If you mean just the spiraling thread itself, that is called the external thread.
There are two parts to a bottle seal: the finish and the closure. The closure is the sealing device; the finish (also called the neck finish) is the part of the bottle that accepts the closure. On a screwtop bottle, the finish’s external thread fits to the cap’s matching internal thread.
There are many other types of finish to accept other closures such as the familiar stoppers (corks), crown caps, etc.
Supporting facts, references, and specific expertise:
It's the same feature that's on screws and bolts, a thread.