Quick & Easy Steps for Pairing Caps with Bottles

How to Choose the Right Cap for Your Bottle

Cap sizes are not interchangeable. For example, a 28/400 cap will not fit properly on a bottle with a 28/410 neck finish. As you can see here, the size for screw caps are generally noted as two numbers.

  1. The first number refers to the nominal diameter, in millimeters (mm), measured across the outside of the bottle's neck. This measurement must match the nominal diameter of the inside of the cap you choose.
  2. The second number refers to the thread finish on bottles and caps. The following is a selection of common thread sizes:

Once you have determined the above two numbers, you can safely choose a matching cap for your bottle.

Our tech staff are available to help you choose the right caps for your bottles. Call 800-821-0349.

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