Steel Beam Sizes / Australia / RHS / 125×75×3.8 RHS
125×75×3.8 RHS Steel Beam Dimensions and Properties
ASNZS Rectangular hollow sections · v2019.11
Diagram, properties emphasis, and nearby alternatives use the selected unit system.
Section diagram
125×75×3.8 RHS dimensions
Not to scale. Dimensions shown for reference.
Section properties
Symbols match the steel section finder. Imperial and metric values are shown side by side.
| Property | Imperial | Metric |
|---|---|---|
| Weight | 7.44 lb/ft | 11.07 kg/m |
| Height | 4.92 in | 125.00 mm |
| Width | 2.95 in | 75.00 mm |
| t | 0.150 in | 3.800 mm |
| Area | 2.19 in² | 1,410.00 mm² |
| Ix | 7.04 in⁴ | 2,930,000 mm⁴ |
| Iy | 3.20 in⁴ | 1,330,000 mm⁴ |
| Sx | 2.86 in³ | 46,880.00 mm³ |
| Sy | 2.16 in³ | 35,466.67 mm³ |
| Zx | 3.52 in³ | 57,700.00 mm³ |
| Zy | 2.48 in³ | 40,600.00 mm³ |
| rx | 1.79 in | 45.59 mm |
| ry | 1.21 in | 30.71 mm |
| J | 7.26 in⁴ | 3,020,000 mm⁴ |
Alternatives
Useful nearby sections
Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus 125×75×3.8 RHS.
Lighter in Rectangular hollow sections
100×50×5.0 RHS
- Weight
- 10.3 kg/m (-7.1%)
- Depth
- 100.0 mm (-20%)
- Ix
- 1,530,000 mm⁴ (-48%)
Heavier in Rectangular hollow sections
125×75×4.0 RHS
- Weight
- 11.6 kg/m (+5.0%)
- Depth
- 125.0 mm (0.0%)
- Ix
- 3,050,000 mm⁴ (+4.1%)
Closest Iₓ in Rectangular hollow sections
150×50×3.0 RHS
- Weight
- 8.9 kg/m (-19%)
- Depth
- 150.0 mm (+20%)
- Ix
- 2,990,000 mm⁴ (+2.0%)
Source: Australian-Sections.xlsx (Sheets 1-19) · v2019.11 · Methodology