UPN 400 — Dimensions, Weight & Section Properties
UPN channel per DIN 1026-1
UPN 400 is a UPN channel per DIN 1026-1, 400 mm tall and 110 mm wide, weighing 71.8 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.
UPN 400: cross-section drawn to scale from the tabulated dimensions (h 400, b 110, tw 14, tf 18, r 18 mm)Dimensions (mm)
| Height h | 400 mm |
| Flange width b | 110 mm |
| Web thickness tₘ | 14 mm |
| Flange thickness tᶠ | 18 mm |
| Root radius r | 18 mm |
Weight & Cross-Section
| Weight per meter | 71.8 kg/m |
| Weight of a 6 m bar | 430.8 kg |
| Weight of a 12 m bar | 861.6 kg |
| Cross-section area A | 91.5 cm² |
Section Properties (strong / weak axis)
| Moment of inertia Iₓ | 20,350 cm⁴ |
| Section modulus Wₓ | 1,020 cm³ |
| Radius of gyration iₓ | 14.9 cm |
| Moment of inertia Iᵧ | 846 cm⁴ |
| Section modulus Wᵧ | 102 cm³ |
| Radius of gyration iᵧ | 3.04 cm |
Compared with the neighbouring sizes
| Profile | h × b (mm) | G (kg/m) | Iₓ (cm⁴) | Wₓ (cm³) | Δ weight | Δ Iₓ |
|---|
| UPN 380 | 380 × 102 | 63.1 | 15,760 | 829 | −12 % | −23 % |
| UPN 400 (this page) | 400 × 110 | 71.8 | 20,350 | 1,020 | — | — |
Deflection example
A simply supported UPN 400 spanning 8 m with a 10 kN point load at midspan deflects 2.5 mm (E = 210 GPa, Ix = 20,350 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 UPN 400 weigh?
UPN 400 weighs 71.8 kg per meter. A standard 6 m bar weighs 430.8 kg and a 12 m bar 861.6 kg. The weight follows from the cross-section area of 91.5 cm² multiplied by the steel density of 7,850 kg/m³.
What are the dimensions of UPN 400?
UPN 400 is 400 mm tall and 110 mm wide, with a web thickness of 14 mm, a flange thickness of 18 mm, and a root radius of 18 mm, per DIN 1026-1.
What is the moment of inertia of UPN 400?
About the strong axis, Ix = 20,350 cm⁴ with a section modulus Wx = 1,020 cm³. About the weak axis, Iy = 846 cm⁴ and Wy = 102 cm³. Use the beam deflection calculator to turn these into deflection and stress for your span and load.
UPN 400 or UPN 380 — what does one size down change?
UPN 380 is about 12% lighter (63.1 vs 71.8 kg/m) but about 23% less stiff (Ix 15,760 vs 20,350 cm⁴). Check deflection before downsizing — stiffness falls 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