Square Tubes Spec Table
Square and rectangular hollow sections (square tube) are closed-section steel pipes with superior torsional rigidity compared to open-section structural steel. Widely used in equipment frames, gates, storage structures, and transport trolleys. Available in thicknesses from t1.6 to t9; easy to cut and weld, with a clean appearance that suits assembled structures.
Frequently Asked Questions
When should I choose square tube vs. round pipe?
Square tubes simplify flat welding and bolted connections, ideal for structural frames. Round pipes offer equal strength in all directions and better pressure performance. Frames typically use square tubes; piping uses round.
How do I distinguish between square and rectangular tube applications?
Square tubes suit columns and legs needing equal strength in both directions. Rectangular tubes suit beams where higher strength in one direction is needed — orient the long side in the load direction.
How do I select tube wall thickness (t)?
Determine by structural calculation based on load and span. General frames use t2.3–3.2mm; heavy structures use t4.5–6.0mm. Thicker walls mean more strength but also more weight.