Steel structure
Civil engineering
Industrial manufacturing
CSA G40.21 50W / 350W (Canadian Standards Association) is the Canadian specification for Hollow structural section ( H.S.S).
These tubes can be manufactured with different shapes: round, square, and rectangular H.S.S tubes in hot rolled and cold formed steel. These tubes are manufactured with an electric resistance weld (ERW) or, more rarely, without a bead (Flash Remove).
Note that 50W indicates a 50,000 psi minimum yield and 350W is the metric equivalent of 350 MPa. The CLASS C is the standard recommendation and is mainly used for steel structures and bridge construction.
It stands out because of its superior yield strength, but also because of a reduced thickness tolerance than ASTM – A500 gr C. Altitube Steel has a large inventory of CSA G40.21 50W / 350W C-CLASS tubes. Send us your requests!
| Yield strength | 50 000 PSI |
| Tensile Strength | 65 000 to 90 000 PSI |
| Thickness tolerance | +10% to -5 % from the side |
| Mass tolerance | +10% to -3.5% from the theoretical weight |