Steel Section Catalog
RHS 100x80x4
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 100x80x4 steel profile weighs 10.5 kg/m (7.06 lb/ft), has a depth of 100 mm (3.94 in), flange width 80 mm (3.15 in). Cross-sectional area: 1,376 mm². Moment of inertia Ix = 199.45 cm⁴, Iy = 140.51 cm⁴.
Cross-section (not to scale)
Gauge equivalent: 4 mm ≈ 8 gauge (Manufacturers Standard Gage)
Dimensions
| Property | Metric | Imperial |
|---|---|---|
| Depth (h) | 100 mm | 3.94 in |
| Width (b) | 80 mm | 3.15 in |
| Thickness (t) | 4 mm | 0.16 in |
| Fillet radius (r) | 8 mm | 0.31 in |
| Weight | 10.5 kg/m | 7.06 lb/ft |
Section Properties
| Property | Metric | Imperial |
|---|---|---|
| Area (A) | 1,376 mm² | 2.133 in² |
| Moment of inertia (Ix) | 199.45 cm⁴ | 4.79 in⁴ |
| Moment of inertia (Iy) | 140.51 cm⁴ | 3.38 in⁴ |
| Elastic section modulus (Sx) | 39.89 cm³ | 2.434 in³ |
| Elastic section modulus (Sy) | 35.13 cm³ | 2.144 in³ |
| Plastic section modulus (Zx) | 47.65 cm³ | 2.908 in³ |
| Plastic section modulus (Zy) | 40.77 cm³ | 2.488 in³ |
| Radius of gyration (rx) | 3.81 cm | 1.500 in |
| Radius of gyration (ry) | 3.2 cm | 1.260 in |
Beam Calculator— RHS 100x80x4
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mfixed @ 0mfixed @ 6m→kN/m
Results — RHS 100x80x4
Mmax
15.0 kN·m
Vmax
15.0 kN
δmax
42.30 mm
L/142
R115.0 kN| 15.0 kN·mR215.0 kN| -15.0 kN·m
Standard:
