Dimensions
| Parameter | Symbol | Value | Unit | Data |
|---|---|---|---|---|
| Leg length 1 | b1 | 40.0 | mm | U |
| Leg length 2 | b2 | 40.0 | mm | U |
| Thickness | t | 4.0 | mm | U |
| Root radius | r1 | 6.0 | mm | U |
Section Properties
| Parameter | Symbol | Value | Unit | Data |
|---|---|---|---|---|
| General | ||||
| Mass per metre | mass | 2.45 | kg/m | C |
| Gross area | A | 312 | mm² | C |
| Centroid x̄ (from left/heel) | xc | 11.3 | mm | C |
| Centroid ȳ (from bottom) | yc | 11.3 | mm | C |
| About x-axis (major) | ||||
| Second moment of area IxAbout centroidal axis parallel to leg b2 | Ix | 0.046 | 10⁶ mm⁴ | C |
| Elastic section modulus Zx (min) | Zx | 1.6 | 10³ mm³ | C |
| Radius of gyration rx | rx | 12.2 | mm | C |
| About y-axis (minor) | ||||
| Second moment of area IyAbout centroidal axis parallel to leg b1 | Iy | 0.046 | 10⁶ mm⁴ | C |
| Elastic section modulus Zy (min) | Zy | 1.6 | 10³ mm³ | C |
| Radius of gyration ry | ry | 12.2 | mm | C |
| Principal axes | ||||
| Major principal second moment I1 | I1 | 0.073 | 10⁶ mm⁴ | C |
| Minor principal second moment I2 | I2 | 0.019 | 10⁶ mm⁴ | C |
| Minimum radius of gyration r2 | r2 | 7.9 | mm | C |
| Principal axis angleAngle between x-axis and major principal axis | alpha | 45.0 | ° | C |
| Torsion & warping | ||||
| Torsion constant JApproximate thin-walled value, fillets neglected | J | 0.002 | 10⁶ mm⁴ | C |
| Surface area | ||||
| External surface areaToe radii neglected | extArea | 0.157 | m²/m | C |
Nominal designation mass 2.42 kg/m; calculated 2.45 kg/m (+1.1%).
Steel Grades
| Grade | Standard | fy MPa | fu MPa | Note | Data |
|---|---|---|---|---|---|
| S235JR | EN 10025-2:2019 | 235 | 360 | Common grade – confirm with supplier | U |
| S275JR | EN 10025-2:2019 | 275 | 410 | Common grade – confirm with supplier | U |
| S355J2 | EN 10025-2:2019 | 355 | 470 | Available – confirm with supplier | U |
Strengths shown for governing thickness t = 4.0 mm. Density 7850 kg/m³, E = 200 000 MPa.
Where to buy
Producers of Angles – 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: EN 10056-1
Local producer
Standards: EN 10056-1
International producer
Standards: ASTM A36
International producer
Standards: AS/NZS 3679.1
International producer
Standards: IS 808, IS 2062
International producer
Standards: ASTM A36, ASTM A572
Buying checklist
- Specify the section designation, product standard and steel grade exactly (e.g. "L 40x40x4 – EN 10056-1:2017 – S235JR").
- 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
- EN 10056-1:2017 Structural steel equal and unequal leg angles – Dimensions
- Edition
- 2017
- Publication year
- 2017
- Page reference
- —
- Last updated
- 2026-10-12
- Verification status
- Unverified
Toe radii neglected in calculated properties. Nominal dimensions require verification against EN 10056-1:2017 Structural steel equal and unequal leg angles – Dimensions and the manufacturer catalogue before design use.