Dimensions
| Parameter | Symbol | Value | Unit | Data |
|---|---|---|---|---|
| Outside diameter | D | 323.9 | mm | U |
| Thickness | t | 6.4 | mm | U |
Section Properties
| Parameter | Symbol | Value | Unit | Data |
|---|---|---|---|---|
| General | ||||
| Mass per metre | mass | 50.11 | kg/m | C |
| Gross area | A | 6,384 | mm² | C |
| About x-axis (major) | ||||
| Second moment of area Ix | Ix | 80.472 | 10⁶ mm⁴ | C |
| Elastic section modulus Zx (min) | Zx | 496.9 | 10³ mm³ | C |
| Plastic section modulus Sx | Sx | 645.2 | 10³ mm³ | C |
| Radius of gyration rx | rx | 112.3 | mm | C |
| About y-axis (minor) | ||||
| Second moment of area Iy | Iy | 80.472 | 10⁶ mm⁴ | C |
| Elastic section modulus Zy (min) | Zy | 496.9 | 10³ mm³ | C |
| Plastic section modulus Sy | Sy | 645.2 | 10³ mm³ | C |
| Radius of gyration ry | ry | 112.3 | mm | C |
| Torsion & warping | ||||
| Torsion constant JExact (2I) | J | 160.945 | 10⁶ mm⁴ | C |
| Surface area | ||||
| External surface area | extArea | 1.018 | m²/m | C |
| Internal surface area | intArea | 0.977 | m²/m | C |
Steel Grades
| Grade | Standard | fy MPa | fu MPa | Note | Data |
|---|---|---|---|---|---|
| C350L0 | AS/NZS 1163:2016 | 350 | 430 | Typical grade for larger CHS – confirm with supplier | U |
| C250L0 | AS/NZS 1163:2016 | 250 | 320 | Typical grade for smaller CHS – confirm with supplier | U |
Strengths shown for governing thickness t = 6.4 mm. Density 7850 kg/m³, E = 200 000 MPa.
Where to buy
Producers of Hollow sections & pipes – local mills first. Buy direct from the mill for large tonnages, or through a steel distributor / stockist for small quantities and cut lengths.
Local producer
Standards: AS/NZS 1163
International producer
Standards: JIS G 3444
International producer
Standards: EN 10210, EN 10219
International producer
Standards: JIS G 3444, JIS G 3466
International producer
Standards: GB/T 8162, GB/T 8163
International producer
Standards: ASTM A500, ASTM A1085
Buying checklist
- Specify the section designation, product standard and steel grade exactly (e.g. "323.9x6.4CHS – AS/NZS 1163:2016 – C350L0").
- Ask for mill test certificates (EN 10204 type 3.1 or equivalent) traceable to the heat number.
- Sections from another standard system are not automatically equivalent – have the engineer approve any substitution.
- Check availability, minimum order quantity, stock lengths, lead time and delivery terms with the mill or distributor.
All producers of this product type →
Listing is informational only – not an endorsement, offer or confirmation of availability. Company details are marked UNVERIFIED until checked.
Source & Verification
- Source publisher
- Pending verification – nominal dimensions entered by the application developer
- Source document
- AS/NZS 1163:2016 Cold-formed structural steel hollow sections
- Edition
- 2016
- Publication year
- 2016
- Page reference
- —
- Last updated
- 2026-10-12
- Verification status
- Unverified
Typical grade: C350L0. Nominal dimensions require verification against AS/NZS 1163:2016 Cold-formed structural steel hollow sections and the manufacturer catalogue.