Steel Section Catalog
U 120x40x3.05
BR — Cold-formed Channel
Cold-formed channels (U shapes) are similar to C shapes but without stiffening lips. Used for light structural framing, supports, and secondary members.
The U 120x40x3.05 steel profile weighs 6.7 kg/m (4.51 lb/ft), has a depth of 120 mm (4.72 in), flange width 40 mm (1.57 in). Cross-sectional area: 582.1 mm². Moment of inertia Ix = 117.74 cm⁴, Iy = 7.31 cm⁴.
Cross-section (not to scale)
Gauge equivalent: 3.05 mm ≈ 11 gauge (Manufacturers Standard Gage)
Dimensions
| Property | Metric | Imperial |
|---|---|---|
| Depth (h) | 120 mm | 4.72 in |
| Width (b) | 40 mm | 1.57 in |
| Thickness (t) | 3.0 mm | 0.12 in |
| Weight | 6.7 kg/m | 4.51 lb/ft |
Section Properties
| Property | Metric | Imperial |
|---|---|---|
| Area (A) | 582.1 mm² | 0.902 in² |
| Moment of inertia (Ix) | 117.74 cm⁴ | 2.83 in⁴ |
| Moment of inertia (Iy) | 7.31 cm⁴ | 0.18 in⁴ |
| Elastic section modulus (Sx) | 19.62 cm³ | 1.197 in³ |
| Elastic section modulus (Sy) | 2.22 cm³ | 0.135 in³ |
| Plastic section modulus (Zx) | 22.57 cm³ | 1.377 in³ |
| Plastic section modulus (Zy) | 2.67 cm³ | 0.163 in³ |
| Radius of gyration (rx) | 4.5 cm | 1.772 in |
| Radius of gyration (ry) | 1.12 cm | 0.441 in |
Beam Calculator— U 120x40x3.05
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mfixed @ 0mfixed @ 6m→kN/m
Results — U 120x40x3.05
Mmax
15.0 kN·m
Vmax
15.0 kN
δmax
71.66 mm
L/84
R115.0 kN| 15.0 kN·mR215.0 kN| -15.0 kN·m
Standard:
