Aluminium flat bar 31.75 × 5 mm
It weighs 0.43 kg per metre: a 6 m length weighs 2.58 kg. Here you have the drawing, the dimensions and the weight for different numbers of lengths.
- Code
- 5189
- Type
- Flat bar
- Dimensions (mm)
- A31.75C5
- Weight per metre
- 0.43 kg/m
- 6 m length
- 2.58 kg
- Metres per kilo
- 2.33 m
- Equivalent cross-section
- 159.3 mm²
- How it is measured
- A is the width; C is the thickness. CR: rounded edge. It is a different profile, not the same size.
How much do the lengths weigh?
| 6 m lengths | 1 | 5 | 10 | 25 | 50 | 100 |
|---|---|---|---|---|---|---|
| Weight | 2.58 kg | 12.9 kg | 25.8 kg | 64.5 kg | 129 kg | 258 kg |
| Metres | 6 m | 30 m | 60 m | 150 m | 300 m | 600 m |
How much load does the 31.75 × 5 flat bar 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 (31.8 mm high) | 89 kg* | 23 kg | 10 kg | 5.6 kg |
| Flat (5 mm high) | 2.2 kg | 0.6 kg | 0.2 kg | 0.1 kg |
Moment of inertia 1.33 cm⁴ upright · 0.03 cm⁴ flat; section modulus 0.84 cm³ upright · 0.13 cm³ flat. * Here the strength of the material governs, not the deflection. 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 flat bars
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.