Round HSS — All Sizes
Round hollow structural sections, listed by outside diameter and wall thickness. A round HSS has the same section modulus in every direction, so it has no orientation to get wrong and no weak axis at all, which is why it is the usual choice for a truss web, a pipe rack column and anything that has to look the same from all sides. It is not pipe: the wall is a design wall and the sizes are AISC's, not a nominal pipe schedule. Normally supplied to ASTM A500 Grade C. 189 sizes are published here across 33 series, OD 1.66 in to 28 in and 2.27 lb/ft to 288.63 lb/ft.
33 series, 189 sizes
round HSS by OD
| Series | OD (in) | Sizes |
|---|---|---|
| HSS1.66 Round | 1.66 | 1 |
| HSS1.9 Round | 1.9 | 3 |
| HSS2.375 Round | 2.38 | 5 |
| HSS2.5 Round | 2.5 | 3 |
| HSS2.875 Round | 2.88 | 4 |
| HSS3 Round | 3 | 7 |
| HSS3.5 Round | 3.5 | 7 |
| HSS4 Round | 4 | 7 |
| HSS4.5 Round | 4.5 | 5 |
| HSS5 Round | 5 | 7 |
| HSS5.5 Round | 5.5 | 3 |
| HSS5.563 Round | 5.56 | 5 |
| HSS6 Round | 6 | 7 |
| HSS6.625 Round | 6.63 | 8 |
| HSS6.875 Round | 6.88 | 4 |
| HSS7 Round | 7 | 6 |
| HSS7.5 Round | 7.5 | 5 |
| HSS8.625 Round | 8.63 | 6 |
| HSS9.625 Round | 9.63 | 6 |
| HSS10 Round | 10 | 6 |
| HSS10.75 Round | 10.8 | 6 |
| HSS11.75 Round | 11.8 | 5 |
| HSS12 Round | 12 | 4 |
| HSS12.75 Round | 12.8 | 6 |
| HSS13.375 Round | 13.4 | 6 |
| HSS14 Round | 14 | 9 |
| HSS16 Round | 16 | 9 |
| HSS18 Round | 18 | 8 |
| HSS20 Round | 20 | 8 |
| HSS22 Round | 22 | 5 |
| HSS24 Round | 24 | 7 |
| HSS26 Round | 26 | 5 |
| HSS28 Round | 28 | 6 |
Other shape families
- W-Shape (Wide Flange)
289 sizes
- HP-Shape (Bearing Pile)
22 sizes
- C-Shape (American Standard Channel)
32 sizes
- MC-Shape (Miscellaneous Channel)
40 sizes
- Angle (Equal and Unequal Leg)
137 sizes
- Rectangular and Square HSS
525 sizes
Relevant tools
- Steel Shape Properties Table
search and compare every round hollow structural section against the other families
- Beam Shear, Moment and Deflection Diagram Calculator
check a span made up of one of these sizes
- Steel Weight Calculator
total the tonnage once the sizes are picked
- ASTM A500 Grade C
the grade round HSS is normally supplied to
- All Shape Series
every published series, W-shapes through round HSS