StructureCalcs21.3 x 3.2 CHS
Circular Hollow Section · AS/NZS 1163 · Australia / New Zealand
21.3 x 3.2 CHS is a circular hollow section 21.3 mm in outside diameter with a 3.2 mm wall, weighing 1.4 kg/m. The dimensions below are the published AS/NZS 1163 values; the drawing is generated from them.
Circular Hollow Sections are cold-formed tubes to AS/NZS 1163 — efficient in compression and torsion, with identical stiffness about every axis.
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Published dimensions
| Property | Metric | Imperial |
|---|---|---|
| Outside diameter, d | 21.3 mm | 0.84 in |
| Wall thickness, t | 3.2 mm | 0.126 in |
| Mass per metre | 1.4 kg/m | 1.0 lb/ft |
| Area, A | 182 mm² | 0.28 in² |
| Second moment, Ix | 7,684 mm⁴ | 0.0 in⁴ |
| Second moment, Iy | 7,684 mm⁴ | 0.0 in⁴ |
Derived section properties
Integrated analytically from the exact circular tube. For 21.3 x 3.2 CHS the computed area agrees with the published value to 0.02% and Ix to better than 0.01%. Where a value is also published, the published one above is the one to quote.
| Property | Value |
|---|---|
| Elastic modulus, Zx | 722 mm³ |
| Elastic modulus, Zy | 722 mm³ |
| Plastic modulus, Sx | 1,059 mm³ |
| Plastic modulus, Sy | 1,059 mm³ |
| Radius of gyration, rx | 6.5 mm |
| Radius of gyration, ry | 6.5 mm |
Z is the elastic modulus and S the plastic modulus, following AS 4100. Under AISC 360 the letters are reversed.
Neighbouring sizes
Where these numbers come from
Published AS/NZS 1163 values. How StructureCalcs verifies its numbers · Understanding steel section properties · Query this section over the API