Bottles are a popular container and come in various materials such as PET, HDPE, PETG. They are available in many shapes and styles and can be decorated with silk screen printing or labels.
The neck finish refers to the outer threads on the container and holds the caps and closures in place. To pair a cap with a container, the neck finishes must match.
Common Neck Finishes
Find a cap’s diameter by measuring from one side of the inner wall to the opposite side. Calculate a bottle’s neck finish by measuring the diameter of the outermost threads. The resulting millimeter measurement will be the “T” dimension.
Then, see how many times the threads pass one another to determine the finish. (ex. 24 mm “T” dimension with 1 thread turn = 24/400 neck finish)
Measuring Neck Finish
To find a cap's diameter, measure from one side of the inner wall to the opposite side. Calculate a bottle's neck finish by measuring the diameter of the outmost threads. The resulting millimeter measurement will be the “T” dimension.
T Dimension = Outside diameter of the thread
E Dimension = Outside diameter of the neck
I Dimension = Inner diameter of the bottle neck
S Dimension = Height from the top of the first thread to the finish
H Dimension = Height of the neck finish
