Square Tube. Square tubes are formed from coils and then ran through a series of dies. They are are welded from the inside to form their shape. Square tubes are generally used for maintenance and structural purposes. … Square Tube is commonly available in Aluminum, Stainless Steel, Hot Rolled Steel and Cold Rolled Steel.
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Square tubing is commonly used as a railing along staircases. However, it is also used in other, less obvious ways as well. From being used for fencing around yards to structures of buildings, as well as entry gates and entrances, a wide variety of applications are solved by steel square tubing
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.
