Square tubing is a hollow, long steel bar. Square tubing sizes are usually defined by their overall dimensions and wall thickness.
Square Tubing Sizes
The outer shape refers to the side length of the square outside the tubing. Wall thickness determines the tubing’s strength. Common square tube sizes range from 20 x 20 x 2 mm to 400 x 400 x 20 mm. The specific sizes of square tubes vary according to regions and standards.
References
ASTM A500-21 Standard Specification for Cold-Formed Welded and Seamless Carbon Steel Structural Tubing.
Industry Standards & Specifications
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