Aluminium U channel 20.9 × 12 × 1.2 mm
It weighs 0.135 kg per metre: a 6 m length weighs 0.81 kg. Here you have the drawing, the dimensions and the weight for different numbers of lengths.
- Code
- 5660
- Type
- U channel
- Dimensions (mm)
- A20.9B12C1.2
- Weight per metre
- 0.135 kg/m
- 6 m length
- 0.81 kg
- Metres per kilo
- 7.41 m
- Equivalent cross-section
- 50 mm²
- How it is measured
- A is the overall width; B is the leg height; C is the thickness.
How much do the lengths weigh?
| 6 m lengths | 1 | 5 | 10 | 25 | 50 | 100 |
|---|---|---|---|---|---|---|
| Weight | 0.81 kg | 4.05 kg | 8.1 kg | 20.3 kg | 40.5 kg | 81 kg |
| Metres | 6 m | 30 m | 60 m | 150 m | 300 m | 600 m |
How much load does the 20.9 × 12 × 1.2 U channel 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 |
|---|---|---|---|---|
| Upright (20.9 mm high) | 23 kg | 5.8 kg | 2.6 kg | 1.4 kg |
| Flat (12 mm high) | 4.8 kg | 1.2 kg | 0.5 kg | 0.3 kg |
Moment of inertia 0.34 cm⁴ upright · 0.07 cm⁴ flat; section modulus 0.33 cm³ upright · 0.09 cm³ flat. 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 U channels
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.