Steel Section Catalog
U 100x40x4.25
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 100x40x4.25 steel profile weighs 8.0 kg/m (5.38 lb/ft), has a depth of 100 mm (3.94 in), flange width 40 mm (1.57 in). Cross-sectional area: 710.8 mm². Moment of inertia Ix = 100.78 cm⁴, Iy = 8.86 cm⁴.
Cross-section (not to scale)
Gauge equivalent: 4.25 mm ≈ 8 gauge (Manufacturers Standard Gage)
Dimensions
| Property | Metric | Imperial |
|---|---|---|
| Depth (h) | 100 mm | 3.94 in |
| Width (b) | 40 mm | 1.57 in |
| Thickness (t) | 4.3 mm | 0.17 in |
| Weight | 8.0 kg/m | 5.38 lb/ft |
Section Properties
| Property | Metric | Imperial |
|---|---|---|
| Area (A) | 710.8 mm² | 1.102 in² |
| Moment of inertia (Ix) | 100.78 cm⁴ | 2.42 in⁴ |
| Moment of inertia (Iy) | 8.86 cm⁴ | 0.21 in⁴ |
| Elastic section modulus (Sx) | 20.16 cm³ | 1.230 in³ |
| Elastic section modulus (Sy) | 2.74 cm³ | 0.167 in³ |
| Plastic section modulus (Zx) | 23.18 cm³ | 1.415 in³ |
| Plastic section modulus (Zy) | 3.28 cm³ | 0.200 in³ |
| Radius of gyration (rx) | 3.77 cm | 1.484 in |
| Radius of gyration (ry) | 1.12 cm | 0.441 in |
Beam Calculator— U 100x40x4.25
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mfixed @ 0mfixed @ 6m→kN/m
Results — U 100x40x4.25
Mmax
15.0 kN·m
Vmax
15.0 kN
δmax
83.72 mm
L/72
R115.0 kN| 15.0 kN·mR215.0 kN| -15.0 kN·m
Standard:
