IPN 400 — Dimensions, Weight & Section Properties
IPN I-beam per EN 10365 (DIN 1025-1)
IPN 400 is a IPN I-beam per EN 10365 (DIN 1025-1), 400 mm tall and 155 mm wide, weighing 92.4 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 | 400 mm |
| Flange width b | 155 mm |
| Web thickness tₘ | 14.4 mm |
| Flange thickness tᶠ | 21.6 mm |
| Root radius r | 14.4 mm |
Weight & Cross-Section
| Weight per meter | 92.4 kg/m |
| Weight of a 6 m bar | 554.4 kg |
| Weight of a 12 m bar | 1,108.8 kg |
| Cross-section area A | 118 cm² |
Section Properties (strong / weak axis)
| Moment of inertia Iₓ | 29,210 cm⁴ |
| Section modulus Wₓ | 1,460 cm³ |
| Radius of gyration iₓ | 15.7 cm |
| Moment of inertia Iᵧ | 1,160 cm⁴ |
| Section modulus Wᵧ | 149 cm³ |
| Radius of gyration iᵧ | 3.13 cm |
Compared with the neighbouring sizes
| Profile | h × b (mm) | G (kg/m) | Iₓ (cm⁴) | Wₓ (cm³) | Δ weight | Δ Iₓ |
|---|---|---|---|---|---|---|
| IPN 380 | 380 × 149 | 84 | 24,010 | 1,260 | −9 % | −18 % |
| IPN 400 (this page) | 400 × 155 | 92.4 | 29,210 | 1,460 | — | — |
| IPN 450 | 450 × 170 | 115 | 45,850 | 2,040 | +24 % | +57 % |
Deflection example
A simply supported IPN 400 spanning 8 m with a 10 kN point load at midspan deflects 1.74 mm (E = 210 GPa, Ix = 29,210 cm⁴). The L/360 serviceability limit for this span is 22.2 mm — the profile passes this quick check.
Calculate your own span and load →
Frequently Asked Questions
How much does IPN 400 weigh?
IPN 400 weighs 92.4 kg per meter. A standard 6 m bar weighs 554.4 kg and a 12 m bar 1,108.8 kg. The weight follows from the cross-section area of 118 cm² multiplied by the steel density of 7,850 kg/m³.
What are the dimensions of IPN 400?
IPN 400 is 400 mm tall and 155 mm wide, with a web thickness of 14.4 mm, a flange thickness of 21.6 mm, and a root radius of 14.4 mm, per EN 10365 (DIN 1025-1).
What is the moment of inertia of IPN 400?
About the strong axis, Ix = 29,210 cm⁴ with a section modulus Wx = 1,460 cm³. About the weak axis, Iy = 1,160 cm⁴ and Wy = 149 cm³. Use the beam deflection calculator to turn these into deflection and stress for your span and load.
IPN 400 or IPN 450 — what does one size up change?
IPN 450 is about 24% heavier (115 vs 92.4 kg/m) but about 57% stiffer (Ix 45,850 vs 29,210 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