When it comes to tubes, it is essential to understand the different measurements that characterize them to ensure correct selection and use. Of these, the most important are the Gauge, ID and OD.

Gauge

This is the thickness measurement of the tube. The Birmingham Wire Gauge terminology is used in the pipe industry. For each ‘Gauge’ there is a corresponding thickness in millimeters.

ID (Inside Diameter)

This is the English abbreviation for the inside diameter of the tube. It can be indicated in inches or millimeters, depending on the measuring system and reference standards.

OD (Outer Diameter

This is the English abbreviation identifying the outside diameter of the tube. It can be indicated in inches or millimeters, depending on the measuring system and reference standards.

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