HEM 340 — Dimensions, Weight & Section Properties
HEM heavy wide-flange beam per EN 10365 (DIN 1025-4)
HEM 340 is a HEM heavy wide-flange beam per EN 10365 (DIN 1025-4), 377 mm tall and 309 mm wide, weighing 248 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 | 377 mm |
| Flange width b | 309 mm |
| Web thickness tₘ | 21 mm |
| Flange thickness tᶠ | 40 mm |
| Root radius r | 27 mm |
Weight & Cross-Section
| Weight per meter | 248 kg/m |
| Weight of a 6 m bar | 1,488 kg |
| Weight of a 12 m bar | 2,976 kg |
| Cross-section area A | 315.8 cm² |
Section Properties (strong / weak axis)
| Moment of inertia Iₓ | 76,370 cm⁴ |
| Section modulus Wₓ | 4,052 cm³ |
| Radius of gyration iₓ | 15.6 cm |
| Moment of inertia Iᵧ | 19,710 cm⁴ |
| Section modulus Wᵧ | 1,276 cm³ |
| Radius of gyration iᵧ | 7.9 cm |
Compared with the neighbouring sizes
| Profile | h × b (mm) | G (kg/m) | Iₓ (cm⁴) | Wₓ (cm³) | Δ weight | Δ Iₓ |
|---|---|---|---|---|---|---|
| HEM 320 | 359 × 309 | 245 | 68,130 | 3,796 | −1 % | −11 % |
| HEM 340 (this page) | 377 × 309 | 248 | 76,370 | 4,052 | — | — |
| HEM 360 | 395 × 308 | 250 | 84,870 | 4,297 | +1 % | +11 % |
Deflection example
A simply supported HEM 340 spanning 8 m with a 10 kN point load at midspan deflects 0.67 mm (E = 210 GPa, Ix = 76,370 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 HEM 340 weigh?
HEM 340 weighs 248 kg per meter. A standard 6 m bar weighs 1,488 kg and a 12 m bar 2,976 kg. The weight follows from the cross-section area of 315.8 cm² multiplied by the steel density of 7,850 kg/m³.
What are the dimensions of HEM 340?
HEM 340 is 377 mm tall and 309 mm wide, with a web thickness of 21 mm, a flange thickness of 40 mm, and a root radius of 27 mm, per EN 10365 (DIN 1025-4).
What is the moment of inertia of HEM 340?
About the strong axis, Ix = 76,370 cm⁴ with a section modulus Wx = 4,052 cm³. About the weak axis, Iy = 19,710 cm⁴ and Wy = 1,276 cm³. Use the beam deflection calculator to turn these into deflection and stress for your span and load.
HEM 340 or HEM 360 — what does one size up change?
HEM 360 is about 1% heavier (250 vs 248 kg/m) but about 11% stiffer (Ix 84,870 vs 76,370 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