Understanding Bottle Caps & Closures


Bottle caps & closures have been designed to keep the liquid contents inside the container, fresh and clean. The bottle cap also needs to be easy to use, while giving the consumer easy access to the liquid contents inside. Bottle caps come in some really stylish choices and are available in any colour. They have been designed to work with creams, lotions and oils of all viscosities. Each cap and closures can be designed to work with a ‘dosage’ through a number of different ways. This can be emphasised through the dimension of the hole or using a silicone release valve. Sometimes it best to use a simple screw cap which enables the consumer to pour directly from the bottle.


Disc Cap


Twist Cap


Over Cap


Flip Cap


Screw Cap


Nozzle Pull Cap


Caps & Closure Sizes

The cap or closure size has a very distinctive variable. An example of this would be 24/410. In manufacturing or distribution terms, this number has to match up with a bottle neck size of the same number. The 24 part of the code equates to ’24mm’, the width of the bottle cap, whereas the ‘410’ relates to the height of the cap. The height can be also be different, the ‘410’ can vary in height for each different cap. This will be looked up on a spread sheet if the data is required. In conclusion, a 24/410 cap size will work with a 24/410 bottle neck size.



Refers to the outer diameter of the thread on the bottle neck. This will make contact with the cap or closure.

Is the edge of the bottle neck but excludes the edge of the thread. The difference between the “E” and “T” dimensions divided by two determines the thread depth.

This inner bottle neck determines the range of caps and closures compatible with the opening. This measermenet is also important for filling the bottle with the liquid contents, different closure types including plugs, seals and dispensing pumps.

Measures the top edge of the bottle neck through to the first thread. This fact determines the connection type needed for the cap or closure to fit tight and secure.

Is the height of the overall neck size. A measurement that starts at point “T” and finishes at the bottle neck shoulder.