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Re: square tubing loads

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You should use the American Iron and Steel Institute Specification for the Design of Cold-formed Members, with Commentary for rectangular and single-angle legs.  Pipe and solid bar design should be based on the American Institute of Steel Construction Manual of steel Construction.
A practical table design will need to take into account lateral load capacity that would allow a person to lean on the table, so that some amount of bending moment will need to be included in the leg analysis.  Four legs of minimum thickness on a table capable of supporting 400 pounds may not be practical if they are so thin that they could be crushed by hand like a beer can, or by accidentally kicking them.
Nels Roselund
Structural Engineer
South San Gabriel, CA