Steel Section Catalog
RHS 80x40x4
EN — Rectangular Hollow Section
Rectangular Hollow Sections (RHS) are tubular profiles with excellent torsional resistance and aesthetic appeal. Used for columns, trusses, and exposed structural elements.
The RHS 80x40x4 steel profile weighs 6.7 kg/m (4.51 lb/ft), has a depth of 80 mm (3.15 in), flange width 40 mm (1.57 in). Cross-sectional area: 896 mm². Moment of inertia Ix = 71.13 cm⁴, Iy = 23.01 cm⁴.
Cross-section (not to scale)
Gauge equivalent: 4 mm ≈ 8 gauge (Manufacturers Standard Gage)
Dimensions
| Property | Metric | Imperial |
|---|---|---|
| Depth (h) | 80 mm | 3.15 in |
| Width (b) | 40 mm | 1.57 in |
| Thickness (t) | 4 mm | 0.16 in |
| Fillet radius (r) | 8 mm | 0.31 in |
| Weight | 6.7 kg/m | 4.51 lb/ft |
Section Properties
| Property | Metric | Imperial |
|---|---|---|
| Area (A) | 896 mm² | 1.389 in² |
| Moment of inertia (Ix) | 71.13 cm⁴ | 1.71 in⁴ |
| Moment of inertia (Iy) | 23.01 cm⁴ | 0.55 in⁴ |
| Elastic section modulus (Sx) | 17.78 cm³ | 1.085 in³ |
| Elastic section modulus (Sy) | 11.5 cm³ | 0.702 in³ |
| Plastic section modulus (Zx) | 22.53 cm³ | 1.375 in³ |
| Plastic section modulus (Zy) | 13.57 cm³ | 0.828 in³ |
| Radius of gyration (rx) | 2.82 cm | 1.110 in |
| Radius of gyration (ry) | 1.6 cm | 0.630 in |
Beam Calculator— RHS 80x40x4
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mfixed @ 0mfixed @ 6m→kN/m
Results — RHS 80x40x4
Mmax
15.0 kN·m
Vmax
15.0 kN
δmax
118.62 mm
L/51
R115.0 kN| 15.0 kN·mR215.0 kN| -15.0 kN·m
Standard:
