Steel Section Catalog
U 120x40x4.25
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 120x40x4.25 steel profile weighs 9.3 kg/m (6.28 lb/ft), has a depth of 120 mm (4.72 in), flange width 40 mm (1.57 in). Cross-sectional area: 795.8 mm². Moment of inertia Ix = 156.75 cm⁴, Iy = 9.31 cm⁴.
Cross-section (not to scale)
Gauge equivalent: 4.25 mm ≈ 8 gauge (Manufacturers Standard Gage)
Dimensions
| Property | Metric | Imperial |
|---|---|---|
| Depth (h) | 120 mm | 4.72 in |
| Width (b) | 40 mm | 1.57 in |
| Thickness (t) | 4.3 mm | 0.17 in |
| Weight | 9.3 kg/m | 6.28 lb/ft |
Section Properties
| Property | Metric | Imperial |
|---|---|---|
| Area (A) | 795.8 mm² | 1.233 in² |
| Moment of inertia (Ix) | 156.75 cm⁴ | 3.77 in⁴ |
| Moment of inertia (Iy) | 9.31 cm⁴ | 0.22 in⁴ |
| Elastic section modulus (Sx) | 26.13 cm³ | 1.595 in³ |
| Elastic section modulus (Sy) | 2.81 cm³ | 0.171 in³ |
| Plastic section modulus (Zx) | 30.04 cm³ | 1.833 in³ |
| Plastic section modulus (Zy) | 3.37 cm³ | 0.206 in³ |
| Radius of gyration (rx) | 4.44 cm | 1.748 in |
| Radius of gyration (ry) | 1.08 cm | 0.425 in |
Beam Calculator— U 120x40x4.25
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mfixed @ 0mfixed @ 6m→kN/m
Results — U 120x40x4.25
Mmax
15.0 kN·m
Vmax
15.0 kN
δmax
53.83 mm
L/111
R115.0 kN| 15.0 kN·mR215.0 kN| -15.0 kN·m
Standard:
