Aluminium square tube 20 × 20 × 1.25 mm
It weighs 0.254 kg per metre: a 6 m length weighs 1.52 kg. Here you have the drawing, the dimensions and the weight for different numbers of lengths.
- Code
- 7721
- Type
- Square tube
- Dimensions (mm)
- A20B1.25
- Weight per metre
- 0.254 kg/m
- 6 m length
- 1.52 kg
- Metres per kilo
- 3.94 m
- Equivalent cross-section
- 94.1 mm²
- How it is measured
- A is the outside side; B is the wall thickness.
How much do the lengths weigh?
| 6 m lengths | 1 | 5 | 10 | 25 | 50 | 100 |
|---|---|---|---|---|---|---|
| Weight | 1.52 kg | 7.62 kg | 15.24 kg | 38.1 kg | 76.2 kg | 152.4 kg |
| Metres | 6 m | 30 m | 60 m | 150 m | 300 m | 600 m |
How much load does the 20 × 20 × 1.25 square tube take?
Supported at both ends, with the load at midspan: how many kilos it takes before it bends more than 1/200 of the span (what windows and light structures usually accept) or goes past the elastic limit of 6063-T5 aluminium.
| Span | 0.5 m | 1 m | 1.5 m | 2 m |
|---|---|---|---|---|
| Load at midspan | 37 kg | 9.3 kg | 4.1 kg | 2.3 kg |
Moment of inertia 0.55 cm⁴; section modulus 0.55 cm³. A guidance calculation for a straight beam with sharp corners, E = 69 GPa, without its own weight or buckling of thin walls: for a structure, the check must be done by an engineer.
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Other sizes of square tubes
Data from the Perfiles de Aluminio standard profile catalogue, 2026 edition, published with its permission. The weight per metre is the one declared by the manufacturer; the actual weight may vary within the tolerances of the standard. The equivalent cross-section is calculated with a density of 2.699 g/cm³. Standard length: 6 m.