Dimensions
| Parameter | Symbol | Value | Unit | Data |
|---|---|---|---|---|
| Depth | d | 304.0 | mm | U |
| Flange width | bf | 165.0 | mm | U |
| Flange thickness | tf | 10.2 | mm | U |
| Web thickness | tw | 6.1 | mm | U |
| Root radius | r1 | 11.4 | mm | U |
Section Properties
| Parameter | Symbol | Value | Unit | Data |
|---|---|---|---|---|
| General | ||||
| Mass per metre | mass | 40.88 | kg/m | C |
| Gross area | A | 5,208 | mm² | C |
| About x-axis (major) | ||||
| Second moment of area Ix | Ix | 86.430 | 10⁶ mm⁴ | C |
| Elastic section modulus Zx (min) | Zx | 568.6 | 10³ mm³ | C |
| Plastic section modulus Sx | Sx | 632.7 | 10³ mm³ | C |
| Radius of gyration rx | rx | 128.8 | mm | C |
| About y-axis (minor) | ||||
| Second moment of area Iy | Iy | 7.646 | 10⁶ mm⁴ | C |
| Elastic section modulus Zy (min) | Zy | 92.7 | 10³ mm³ | C |
| Plastic section modulus Sy | Sy | 142.1 | 10³ mm³ | C |
| Radius of gyration ry | ry | 38.3 | mm | C |
| Torsion & warping | ||||
| Torsion constant JApproximate thin-walled value, fillets neglected | J | 0.138 | 10⁶ mm⁴ | C |
| Warping constant IwIy·(d−tf)²/4 | Iw | 165.00 | 10⁹ mm⁶ | C |
| Surface area | ||||
| External surface area | extArea | 1.236 | m²/m | C |
Nominal designation mass 40.40 kg/m; calculated 40.88 kg/m (+1.2%).
Steel Grades
| Grade | Standard | fy MPa | fu MPa | Note | Data |
|---|---|---|---|---|---|
| 300 | AS/NZS 3679.1:2016 | 320 | 440 | Typical grade supplied – confirm availability with supplier | U |
Strengths shown for governing thickness t = 10.2 mm. Density 7850 kg/m³, E = 200 000 MPa.
Where to buy
Producers of Hot-rolled beams & columns (I / H / W) – 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 3679.1
International producer
Standards: EN 10365, BS 4-1, EN 10025
International producer
Standards: EN 10365, EN 10025
International producer
Standards: JIS G 3192, JIS G 3136
International producer
Standards: GB/T 11263, EN 10365, ASTM A6
Profile U
International producer
Standards: GB/T 11263
Profile U
Buying checklist
- Specify the section designation, product standard and steel grade exactly (e.g. "310UB40.4 – AS/NZS 3679.1:2016 – 300").
- 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 3679.1:2016 Structural steel – Hot-rolled bars and sections
- Edition
- 2016
- Publication year
- 2016
- Page reference
- —
- Last updated
- 2026-10-12
- Verification status
- Unverified
Nominal dimensions require verification against the current edition of AS/NZS 3679.1:2016 Structural steel – Hot-rolled bars and sections and the manufacturer catalogue before design use. Properties are calculated by this application from the nominal dimensions.