Steel Section Catalog
U 300x100x4.25
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.
Also known as: U 300x100x4.25 (UK / Australia)
The U 300x100x4.25 steel profile weighs 16.1 kg/m (10.85 lb/ft), has a depth of 300 mm (11.81 in), flange width 100 mm (3.94 in). Cross-sectional area: 2,070.8 mm². Moment of inertia Ix = 2,696.01 cm⁴, Iy = 175.6 cm⁴.
Cross-section (not to scale)
Gauge equivalent: 4.25 mm ≈ 8 gauge (Manufacturers Standard Gage)
Dimensions
| Property | Metric | Imperial |
|---|---|---|
| Depth (h) | 300 mm | 11.81 in |
| Width (b) | 100 mm | 3.94 in |
| Thickness (t) | 4.3 mm | 0.17 in |
| Weight | 16.1 kg/m | 10.85 lb/ft |
Section Properties
| Property | Metric | Imperial |
|---|---|---|
| Area (A) | 2,070.8 mm² | 3.210 in² |
| Moment of inertia (Ix) | 2,696.01 cm⁴ | 64.77 in⁴ |
| Moment of inertia (Iy) | 175.6 cm⁴ | 4.22 in⁴ |
| Elastic section modulus (Sx) | 179.73 cm³ | 10.968 in³ |
| Elastic section modulus (Sy) | 21.63 cm³ | 1.320 in³ |
| Plastic section modulus (Zx) | 206.69 cm³ | 12.613 in³ |
| Plastic section modulus (Zy) | 25.96 cm³ | 1.584 in³ |
| Radius of gyration (rx) | 11.41 cm | 4.492 in |
| Radius of gyration (ry) | 2.91 cm | 1.146 in |
Beam Calculator— U 300x100x4.25
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mfixed @ 0mfixed @ 6m→kN/m
Results — U 300x100x4.25
Mmax
15.0 kN·m
Vmax
15.0 kN
δmax
3.13 mm
L/1917
R115.0 kN| 15.0 kN·mR215.0 kN| -15.0 kN·m
Standard:
