How do I find the right size Cosmetic Packaging's cap or pump?

Before choosing a cap or pump, you need to know the correct size. For example, a 24/410 bottle will only accept 24/410 caps.

How are closure dimensions defined?

Thread closure dimensions are indicated by two numbers separated by a hyphen or a slash.

The first number refers to the inside diameter of the bottle cap (in millimeters) and the outside diameter of the bottle neck fish.

How to Measure the Diameter of a Bottle Cap or Neck - Bottle Caps

How to measure the diameter of a bottle cap or neck

The second number stands for "GPI" or "SPI" Thread finish refers to the height of the closure relative to the number of threads on the container neck. The most common numbers are -400 (one full turn of threads) and 410 (one and a half turns). Some bottles have a neck of -415, which is two full turns.

Common GPI or SPI Neck Fishing Line for Caps or Pumps Closures - Caps Common GPI or SPI Neck Fishing for Caps or Pump Heads

How to measure neck finish?

1. Find the diameter of the cap and measure from one side of the inner wall to the other, or calculate the finish of the neck by measuring the diameter of the outermost thread.

2. See how many times the threads pass each other to determine completion. (eg 24mm diameter, 1 thread = 24/400 neck finish)