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Home / Products / Black Square Tube
As-welded black square hollow sections — the workhorse of metal fabrication. Best value for indoor structures, furniture frames, warehouse racking and machinery builds where galvanizing is not required. 20×20 to 200×200 mm from stock.
| Size (mm) | Wall (mm) | Theoretical weight (kg/m) | Length |
|---|---|---|---|
| 20×20 | 1.2 / 1.5 | 0.70 / 0.86 | 6 m |
| 25×25 | 1.2 / 1.5 | 0.89 / 1.09 | 6 m |
| 30×30 | 1.5 / 2.0 | 1.31 / 1.70 | 6 m |
| 40×40 | 1.5 / 2.0 / 2.5 | 1.77 / 2.31 / 2.85 | 6 m |
| 50×50 | 2.0 / 2.5 | 2.93 / 3.63 | 6 m |
| 60×60 | 2.0 / 3.0 | 3.56 / 5.19 | 6 m |
| 80×80 | 2.5 / 3.0 | 6.00 / 7.07 | 6 m |
| 100×100 | 3.0 / 4.0 | 9.02 / 11.90 | 6 m |
| 150×150 | 5.0 | 22.30 | 6 m |
| 200×200 | 6.0 | 35.80 | 6 m / 12 m |
Material: Q235B (≈ S235JR / ASTM A36 equivalent), as-welded black finish, optional primed
Theoretical weights are calculated from GB standard tables; actual weight is subject to weighbridge. Prices, stock and lead times are indicative and subject to reconfirmation against your purchase list.
Send size, wall thickness, quantity and destination port. Reply the same day.
Combined with: Laser Cutting ServiceFlame Cutting ServiceBending & Folding