CHS 21.3×2.9
Circular hollow sections from Eurocode 3 UK National Annex and ArcelorMittal Sections 2026-1.
Outline drawn from the published dimensions. Fillets and root radii are not shown.
Dimensions
| Property | Metric | Imperial |
|---|---|---|
| Thickness, t | 2.9 mm | 0.114173 in |
| Outside diameter | 21.3 mm | 0.838583 in |
| Inside diameter | 15.5 mm | 0.610236 in |
Bending about the major axis
| Property | Metric | Imperial |
|---|---|---|
| Second moment of area, Iₓ | 7,270 mm⁴ | 0.017466 in⁴ |
| Elastic modulus, Sₓ | 683 mm³ | 0.041679 in³ |
| Plastic modulus, Zₓ | 990 mm³ | 0.060414 in³ |
| Radius of gyration, rₓ | 6.59 mm | 0.259449 in |
| Distance to top fibre | 10.65 mm | 0.4192915 in |
| Distance to bottom fibre | 10.65 mm | 0.4192915 in |
Bending about the minor axis
| Property | Metric | Imperial |
|---|---|---|
| Second moment of area, I_y | 7,270 mm⁴ | 0.017466 in⁴ |
| Elastic modulus, S_y | 683 mm³ | 0.041679 in³ |
| Plastic modulus, Z_y | 990 mm³ | 0.060414 in³ |
| Radius of gyration, r_y | 6.59 mm | 0.259449 in |
Torsion and warping
| Property | Metric | Imperial |
|---|---|---|
| Torsion constant, J | 14,500 mm⁴ | 0.034836 in⁴ |
Mass
| Property | Metric | Imperial |
|---|---|---|
| Mass per metre | 1.32 kg/m | 0.886999 lb/ft |