HSS12-3/4x3/8 (HSS12.75x.375) – HSS Shapes - Round
HSS12-3/4x3/8 is a 12.75 in (324 mm) diameter round hollow section with a 3/8 in (10 mm) nominal wall, weighing 49.61 lb/ft (73.8 kg/m).
Round HSS are closed, circular tube sections, sharing the torsional and biaxial strength advantages of rectangular HSS but in a circular profile that's often preferred where appearance matters — exposed columns, canopy supports, and architectural framing — as well as more utilitarian uses like handrail posts and bollards. The circular shape distributes compressive and torsional loads evenly in every direction, making round HSS a strong, materially efficient choice wherever a round column or post is wanted rather than a square or rectangular one.
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Dimensions
| Property | Value |
|---|---|
| Nominal Weight (lb/ft) | 49.61 |
| Outside Diameter (in) | 12.75 |
| Nominal Thickness (in) | 0.375 |
Full sortable table: Dimensions table for this family
Section Properties
| Property | Value |
|---|---|
| Ix (in⁴) | 262 |
| Zx (in³) | 53.7 |
| Sx (in³) | 41 |
| rx (in) | 4.39 |
| Iy (in⁴) | 262 |
| Zy (in³) | 53.7 |
| Sy (in³) | 41 |
| ry (in) | 4.39 |
| J (in⁴) | 523 |
| C (in³) | 82.1 |
Full sortable table: Section properties table for this family