Circular Hollow Sections, or CHS as they are commonly stylized, are the original and most consistent hollow section since its inception.
| Diameter (mm) | Wall Thickness (mm) | Kg p/m |
|---|---|---|
| 21.3 | 3.0 | |
| 26.9 | 2.5 | – |
| 26.9 | 3.0 | – |
| 33.7 | 2.5 | 1.92 |
| 33.7 | 3.0 | 2.27 |
| 33.7 | 3.2 | 2.41 |
| 33.7 | 4.0 | 2.93 |
| 42.4 | 2.0 | 1.99 |
| 42.4 | 2.5 | 2.46 |
| 42.4 | 3.0 | 2.91 |
| 42.4 | 4.0 | 3.79 |
| 48.3 | 3.0 | 3.35 |
| 48.3 | 4.0 | 4.37 |
| 60.3 | 3.0 | 4.24 |
| 60.3 | 4.0 | 5.55 |
| 60.3 | 5.0 | 6.82 |
| 76.1 | 3.0 | 5.41 |
| 76.1 | 4.0 | 7.11 |
| 76.1 | 5.0 | 8.77 |
| 88.9 | 3.0 | 6.36 |
| 88.9 | 3.0 | 7.37 |
| 88.9 | 4.0 | 8.38 |
| 88.9 | 5.0 | 10.30 |
| 101.6 | 4.0 | 9.63 |
| 114.3 | 3.0 | 8.23 |
| 114.3 | 3.6 | 9.83 |
| 114.3 | 4.0 | 10.74 |
| 114.3 | 5.0 | 13.50 |
| 114.3 | 6.0 | 16.80 |
| 114.3 | 6.0 | 16.0 |
| 139.7 | 4.0 | 13.4 |
| 139.7 | 5.0 | 16.6 |
| 139.7 | 6.0 | 20.7 |
| 139.7 | 8.0 | 26.00 |
| 139.7 | 10.00 | 32.00 |
| 152.4 | 4.0 | 14.60 |
| 168.3 | 5.0 | 20.10 |
| 168.3 | 6.0 | 24.00 |
| 168.3 | 8.0 | 31.60 |
| 168.3 | 10.0 | 39.00 |
| 168.3 | 12.5 | 48.0 |
| 193.7 | 5.0 | 23.30 |
| 193.7 | 6.0 | 29.10 |
| 193.70 | 8.0 | 36.06 |
| 193.70 | 10.0 | 45.30 |
| 219.1 | 5.0 | 26.4 |
| 219.1 | 6.0 | 31.5 |
| 219.1 | 8.0 | 41.6 |
| 219.1 | 10.0 | 51.6 |
| 219.1 | 12.5 | 63.7 |
| 219.1 | 16.0 | 80.1 |
| 244.5 | 10.0 | 57.8 |
| 244.5 | 12.5 | – |
| 273.0 | 10.0 | 64.9 |
| 273.0 | 12.5 | 80.3 |
| 323.9 | 10.0 | 77.4 |
| 323.9 | 12.5 | 96.0 |