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| Designation | External Surface Area | ||
| Actual Outside Diameter | Nominal Thickness | Per metre | Per tonne |
| mm | mm | sqm/m | sqm/tonne |
| 457 | 9.5 | 1.44 | 13.7 |
| 6.4 | 1.44 | 20.2 | |
| 406.4 | 9.5 | 1.28 | 13.7 |
| 6.4 | 1.28 | 20.2 | |
| 355.6 | 9.5 | 1.12 | 13.8 |
| 6.4 | 1.02 | 20.3 | |
| 273.1 | 9.3 | 0.858 | 14.2 |
| 6.4 | 0.858 | 20.4 | |
| 4.8 | 0.858 | 27.0 | |
| 219.1 | 8.2 | 0.688 | 16.1 |
| 6.4 | 0.688 | 20.5 | |
| 4.8 | 0.688 | 27.1 | |
| 168.3 | 7.1 | 0.529 | 18.7 |
| 6.4 | 0.529 | 20.7 | |
| 4.8 | 0.529 | 27.3 | |
| 165.1 | 5.4 | 0.519 | 24.4 |
| 5.0 | 0.519 | 26.3 | |
| 139.7 | 5.4 | 0.439 | 24.5 |
| 5.0 | 0.439 | 26.4 | |
| 114.3 | 5.4 | 0.359 | 24.8 |
| 4.5 | 0.359 | 29.5 | |
| 101.6 | 5.0 | 0.319 | 26.8 |
| 4.0 | 0.319 | 33.2 | |
| 88.9 | 5.9 | 0.279 | 23.1 |
| 5.0 | 0.279 | 27.0 | |
| 4.0 | 0.279 | 33.3 | |
| 3.2 | 0.279 | 41.3 | |
| 76.1 | 5.9 | 0.239 | 23.4 |
| 4.5 | 0.239 | 30.1 | |
| 3.6 | 0.239 | 37.1 | |
| 3.2 | 0.239 | 41.6 | |
| 60.3 | 5.4 | 0.189 | 25.9 |
| 4.5 | 0.189 | 30.6 | |
| 3.6 | 0.189 | 37.6 | |
| 48.3 | 5.4 | 0.152 | 26.6 |
| 4.0 | 0.152 | 34.7 | |
| 3.2 | 0.152 | 42.6 | |
| 42.4 | 4.9 | 0.133 | 29.4 |
| 4.0 | 0.133 | 35.2 | |
| 3.2 | 0.133 | 43.1 | |
Superior know how
External Surface Areas of Circular Hollow Sections
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