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                     Standard Guidelines for Bottle Finish Dimensioning...

Cap and Neck Finishes

  Screw thread cap sizes are generally expressed as two numbers. The first number refers to the cap diameter (in millimeters) and the corresponding Glass Packaging Institute (GPI)/Society of the Plastics Industry (SPI) finish diameter.

 

  The second number refers to the height and thread configuration of the closure or finish. Below is a selection of commonly used caps and finishes.

 

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