Dimension: The height of the neck finish. Measured from the
top of the neck to the point where the diameter, T,
extends down and intersects the shoulder.
S Dimension: Measured from the top of the finish
to the top edge of the first thread. The S dimension
is the key factor in determining the orientation of the closure
to the bottle and the amount of thread engagement between
the bottle and cap.
I Dimension: The inner diameter of the bottle
neck. Specifications require a minimum I to allow
sufficient clearance for filling tubes. Linerless closures,
with a plug or land seal, and dispensing plugs and fitments
require a controlled I for a proper fit.
T Dimension: The outside diameter of the thread.
The tolerance of the T dimension determines the
mate between bottle and closure.
E Dimension: The minor diameter measured across
the root of the threads.