IPN 340 — Dimensions, Weight & Section Properties
IPN I-beam per EN 10365 (DIN 1025-1)
IPN 340 is a IPN I-beam per EN 10365 (DIN 1025-1), 340 mm tall and 137 mm wide, weighing 68 kg per meter. All dimensions and section properties below are the standard published values used in structural design across Europe.
Typical uses: floor beams, columns, frames, and general steel construction. For a quick strength check, use the deflection example below or open the beam calculator with your own span and load.
Dimensions (mm)
| Height h | 340 mm |
| Flange width b | 137 mm |
| Web thickness tₘ | 12.2 mm |
| Flange thickness tᶠ | 18.3 mm |
| Root radius r | 12.2 mm |
Weight & Cross-Section
| Weight per meter | 68 kg/m |
| Weight of a 6 m bar | 408 kg |
| Weight of a 12 m bar | 816 kg |
| Cross-section area A | 86.7 cm² |
Section Properties (strong / weak axis)
| Moment of inertia Iₓ | 15,700 cm⁴ |
| Section modulus Wₓ | 923 cm³ |
| Radius of gyration iₓ | 13.5 cm |
| Moment of inertia Iᵧ | 674 cm⁴ |
| Section modulus Wᵧ | 98.4 cm³ |
| Radius of gyration iᵧ | 2.8 cm |
Compared with the neighbouring sizes
| Profile | h × b (mm) | G (kg/m) | Iₓ (cm⁴) | Wₓ (cm³) | Δ weight | Δ Iₓ |
|---|---|---|---|---|---|---|
| IPN 320 | 320 × 131 | 61 | 12,510 | 782 | −10 % | −20 % |
| IPN 340 (this page) | 340 × 137 | 68 | 15,700 | 923 | — | — |
| IPN 360 | 360 × 143 | 76.1 | 19,610 | 1,090 | +12 % | +25 % |
Deflection example
A simply supported IPN 340 spanning 7 m with a 10 kN point load at midspan deflects 2.17 mm (E = 210 GPa, Ix = 15,700 cm⁴). The L/360 serviceability limit for this span is 19.4 mm — the profile passes this quick check.
Calculate your own span and load →
Frequently Asked Questions
How much does IPN 340 weigh?
IPN 340 weighs 68 kg per meter. A standard 6 m bar weighs 408 kg and a 12 m bar 816 kg. The weight follows from the cross-section area of 86.7 cm² multiplied by the steel density of 7,850 kg/m³.
What are the dimensions of IPN 340?
IPN 340 is 340 mm tall and 137 mm wide, with a web thickness of 12.2 mm, a flange thickness of 18.3 mm, and a root radius of 12.2 mm, per EN 10365 (DIN 1025-1).
What is the moment of inertia of IPN 340?
About the strong axis, Ix = 15,700 cm⁴ with a section modulus Wx = 923 cm³. About the weak axis, Iy = 674 cm⁴ and Wy = 98.4 cm³. Use the beam deflection calculator to turn these into deflection and stress for your span and load.
IPN 340 or IPN 360 — what does one size up change?
IPN 360 is about 12% heavier (76.1 vs 68 kg/m) but about 25% stiffer (Ix 19,610 vs 15,700 cm⁴). Going one size up is usually the cheapest way to cut deflection, because stiffness grows much faster than weight.
Values are entered from the governing standard’s published tables and cross-checked programmatically against its mass and section formulas before publication. Spotted an error? Write to advertising@metalabout.net — verified corrections ship within days. About