Steel Section Catalog
RHS 40x30x3
BR — 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 40x30x3 steel profile weighs 2.9 kg/m (1.92 lb/ft), has a depth of 40 mm (1.57 in), flange width 30 mm (1.18 in). Cross-sectional area: 384 mm². Moment of inertia Ix = 8.14 cm⁴, Iy = 5.08 cm⁴.
Cross-section (not to scale)
Gauge equivalent: 3 mm ≈ 11 gauge (Manufacturers Standard Gage)
Dimensions
| Property | Metric | Imperial |
|---|---|---|
| Depth (h) | 40 mm | 1.57 in |
| Width (b) | 30 mm | 1.18 in |
| Thickness (t) | 3 mm | 0.12 in |
| Fillet radius (r) | 6 mm | 0.24 in |
| Weight | 2.9 kg/m | 1.92 lb/ft |
Section Properties
| Property | Metric | Imperial |
|---|---|---|
| Area (A) | 384 mm² | 0.595 in² |
| Moment of inertia (Ix) | 8.14 cm⁴ | 0.20 in⁴ |
| Moment of inertia (Iy) | 5.08 cm⁴ | 0.12 in⁴ |
| Elastic section modulus (Sx) | 4.07 cm³ | 0.248 in³ |
| Elastic section modulus (Sy) | 3.39 cm³ | 0.207 in³ |
| Plastic section modulus (Zx) | 5.06 cm³ | 0.309 in³ |
| Plastic section modulus (Zy) | 4.1 cm³ | 0.250 in³ |
| Radius of gyration (rx) | 1.46 cm | 0.575 in |
| Radius of gyration (ry) | 1.15 cm | 0.453 in |
Beam Calculator— RHS 40x30x3
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mfixed @ 0mfixed @ 6m→kN/m
Results — RHS 40x30x3
Mmax
15.0 kN·m
Vmax
15.0 kN
δmax
1036.55 mm
L/6
R115.0 kN| 15.0 kN·mR215.0 kN| -15.0 kN·m
Standard:
