HSS18 Round Tube Sizes
The HSS18 Round series runs 8 sizes, from HSS18x1.0 at 181.73 lb/ft to HSS18x.25 at 47.44 lb/ft. They share one outside diameter, so the sizes in it differ only in wall thickness and every one of them fits the same saddle.
HSS18 Round sizes, heaviest first
| Size | lb/ft | OD (in) | t (in) | A (in²) | Ix (in⁴) | Sx (in³) | Zx (in³) |
|---|---|---|---|---|---|---|---|
| HSS18x1.0 | 181.73 | 18 | 0.93 | 49.9 | 1,820 | 202 | 271 |
| HSS18x.875 | 160.19 | 18 | 0.814 | 43.9 | 1,630 | 181 | 241 |
| HSS18x.75 | 138.3 | 18 | 0.698 | 37.9 | 1,420 | 158 | 209 |
| HSS18x.625 | 116.09 | 18 | 0.581 | 31.8 | 1,210 | 134 | 176 |
| HSS18x.5 | 93.54 | 18 | 0.465 | 25.6 | 985 | 109 | 143 |
| HSS18x.375 | 70.66 | 18 | 0.349 | 19.4 | 754 | 83.8 | 109 |
| HSS18x.313 | 59.09 | 18 | 0.291 | 16.2 | 634 | 70.4 | 91.2 |
| HSS18x.25 | 47.44 | 18 | 0.233 | 13 | 512 | 56.9 | 73.4 |
Relevant tools
- Steel Shape Properties Table
search and compare across every series
- Beam Shear, Moment and Deflection Diagram Calculator
check a span made up of one of these sizes
- All Shape Series
every published series, W-shapes through round HSS