IPN 80 — Dimensions, Weight & Section Properties
IPN I-beam per EN 10365 (DIN 1025-1)
IPN 80 is a IPN I-beam per EN 10365 (DIN 1025-1), 80 mm tall and 42 mm wide, weighing 5.94 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 | 80 mm |
| Flange width b | 42 mm |
| Web thickness tₘ | 3.9 mm |
| Flange thickness tᶠ | 5.9 mm |
| Root radius r | 3.9 mm |
Weight & Cross-Section
| Weight per meter | 5.94 kg/m |
| Weight of a 6 m bar | 35.6 kg |
| Weight of a 12 m bar | 71.3 kg |
| Cross-section area A | 7.58 cm² |
Section Properties (strong / weak axis)
| Moment of inertia Iₓ | 77.8 cm⁴ |
| Section modulus Wₓ | 19.5 cm³ |
| Radius of gyration iₓ | 3.2 cm |
| Moment of inertia Iᵧ | 6.29 cm⁴ |
| Section modulus Wᵧ | 3 cm³ |
| Radius of gyration iᵧ | 0.91 cm |
Compared with the neighbouring sizes
| Profile | h × b (mm) | G (kg/m) | Iₓ (cm⁴) | Wₓ (cm³) | Δ weight | Δ Iₓ |
|---|---|---|---|---|---|---|
| IPN 80 (this page) | 80 × 42 | 5.94 | 77.8 | 19.5 | — | — |
| IPN 100 | 100 × 50 | 8.34 | 171 | 34.2 | +40 % | +120 % |
Deflection example
A simply supported IPN 80 spanning 2 m with a 10 kN point load at midspan deflects 10.2 mm (E = 210 GPa, Ix = 77.8 cm⁴). The L/360 serviceability limit for this span is 5.6 mm — the profile does NOT pass this quick check.
Calculate your own span and load →
Frequently Asked Questions
How much does IPN 80 weigh?
IPN 80 weighs 5.94 kg per meter. A standard 6 m bar weighs 35.6 kg and a 12 m bar 71.3 kg. The weight follows from the cross-section area of 7.58 cm² multiplied by the steel density of 7,850 kg/m³.
What are the dimensions of IPN 80?
IPN 80 is 80 mm tall and 42 mm wide, with a web thickness of 3.9 mm, a flange thickness of 5.9 mm, and a root radius of 3.9 mm, per EN 10365 (DIN 1025-1).
What is the moment of inertia of IPN 80?
About the strong axis, Ix = 77.8 cm⁴ with a section modulus Wx = 19.5 cm³. About the weak axis, Iy = 6.29 cm⁴ and Wy = 3 cm³. Use the beam deflection calculator to turn these into deflection and stress for your span and load.
IPN 80 or IPN 100 — what does one size up change?
IPN 100 is about 40% heavier (8.34 vs 5.94 kg/m) but about 120% stiffer (Ix 171 vs 77.8 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