The round aluminium tubes are made of alloy 50ST. This means that the aluminium used is reinforced and has following mechanical specifications::
|Min. torque|| : ||22 kg/mm2|
|0,2 yield strength|| : ||min. 16 kg/mm2|
|Strain|| : ||10 x d min. 10%|
|Hardness|| : ||HB 10 ca. 70 kg/mm2|
The aluminium tubes with outer/inner diameter above are available in lengths of 2 m, 3 m. and 6 m. Sizes length, outer diameter and inner diameter are in mm.
when adding alu tubes with different diameters to construct a telescopic mast. If inner diameter is the same as outer diameter of the next section, sections will not fit without correction!