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Guide to Finding the Correct Cap Size Finish
Aug 28, 2018

Choosing the correct closure or "cap" is a very important step of the packaging process. Plastic and metal closures come in a variety of sizes, styles and colors.

In the packaging industry the word "finish"is used to refer to the material surrounding the neck opening of any container or the inside dimensions of a cap. You'll often see finish sizes written in a format such as 24/410 or 24-410. There are two important parts to this number: the first number, 24, refers to the diameter in millimeters. The second part refers to the thread count. Below, we'll explain how to get these measurements.

The first number you need to find is the diameter. This measurement must be in millimeters (mm).

For a bottle: Measure from the outer edge of the thread on one side to the outer edge of the thread on the opposite side. For example, if the neck measures 24mm, then know it requires a 24mm closure.

For a cap: Measure from the inside wall of the cap to the opposite inside wall.

The second number refers to the thread count. If the thread loops around the neck and passes over itself one time, this is considered a 400 finish. If the thread passes over itself one and a half times, it's considered a 410 finish. If a thread passes over itself 2 times, it's a 415 finish. These are just a few of the most common thread counts.

We highly recommend testing your products with packaging samples to determine proper compatibility. If you need further help please contact our friendly staff.

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