Steel Section Catalog
RHS 80x40x3
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 80x40x3 steel profile weighs 5.2 kg/m (3.49 lb/ft), has a depth of 80 mm (3.15 in), flange width 40 mm (1.57 in). Cross-sectional area: 684 mm². Moment of inertia Ix = 55.85 cm⁴, Iy = 18.43 cm⁴.
Cross-section (not to scale)
Gauge equivalent: 3 mm ≈ 11 gauge (Manufacturers Standard Gage)
Dimensions
| Property | Metric | Imperial |
|---|---|---|
| Depth (h) | 80 mm | 3.15 in |
| Width (b) | 40 mm | 1.57 in |
| Thickness (t) | 3 mm | 0.12 in |
| Fillet radius (r) | 6 mm | 0.24 in |
| Weight | 5.2 kg/m | 3.49 lb/ft |
Section Properties
| Property | Metric | Imperial |
|---|---|---|
| Area (A) | 684 mm² | 1.060 in² |
| Moment of inertia (Ix) | 55.85 cm⁴ | 1.34 in⁴ |
| Moment of inertia (Iy) | 18.43 cm⁴ | 0.44 in⁴ |
| Elastic section modulus (Sx) | 13.96 cm³ | 0.852 in³ |
| Elastic section modulus (Sy) | 9.21 cm³ | 0.562 in³ |
| Plastic section modulus (Zx) | 17.45 cm³ | 1.065 in³ |
| Plastic section modulus (Zy) | 10.61 cm³ | 0.647 in³ |
| Radius of gyration (rx) | 2.86 cm | 1.126 in |
| Radius of gyration (ry) | 1.64 cm | 0.646 in |
Beam Calculator— RHS 80x40x3
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mfixed @ 0mfixed @ 6m→kN/m
Results — RHS 80x40x3
Mmax
15.0 kN·m
Vmax
15.0 kN
δmax
151.07 mm
L/40
R115.0 kN| 15.0 kN·mR215.0 kN| -15.0 kN·m
Standard:
