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Is square tubing measured inside or outside?

FAQ
Is square tubing measured inside or outside?
Update Time:2019-09-12
Tubing is measured by the OUTSIDE DIAMETER (O.D.), specified in inches (e.g., 1.250) or fraction of an inch (eg. 1-1/4″). ... For sizes from 1/8-inch through 12-inch, the NPS corresponds to the nominal inside diameter, but differs somewhat from its actual inside diameter.
        
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