Steel Beam Sizes / Europe / RHS / RHS 300×200×12.5
RHS 300×200×12.5 Steel Beam Dimensions and Properties
EN Rectangular hollow sections · v2026.1
Diagram, properties emphasis, and nearby alternatives use the selected unit system.
Section diagram
RHS 300×200×12.5 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 | 61.75 lb/ft | 91.90 kg/m |
| Height | 11.81 in | 300.00 mm |
| Width | 7.87 in | 200.00 mm |
| t | 0.492 in | 12.500 mm |
| Area | 18.14 in² | 11,700.00 mm² |
| Ix | 343.56 in⁴ | 143,000,000 mm⁴ |
| Iy | 181.15 in⁴ | 75,400,000 mm⁴ |
| Sx | 58.09 in³ | 952,000.00 mm³ |
| Sy | 46.01 in³ | 754,000.00 mm³ |
| Zx | 70.79 in³ | 1,160,000 mm³ |
| Zy | 53.52 in³ | 877,000.00 mm³ |
| rx | 4.33 in | 110.00 mm |
| ry | 3.16 in | 80.20 mm |
| J | 377.19 in⁴ | 157,000,000 mm⁴ |
Alternatives
Useful nearby sections
Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus RHS 300×200×12.5.
Lighter in Rectangular hollow sections
RHS 250×150×16
- Weight
- 90.3 kg/m (-1.7%)
- Depth
- 250.0 mm (-17%)
- Ix
- 88,800,000 mm⁴ (-38%)
Heavier in Rectangular hollow sections
RHS 400×300×8.8
- Weight
- 93.6 kg/m (+1.8%)
- Depth
- 400.0 mm (+33%)
- Ix
- 281,000,000 mm⁴ (+97%)
Closest Iₓ in Rectangular hollow sections
RHS 350×150×10
- Weight
- 74.5 kg/m (-19%)
- Depth
- 350.0 mm (+17%)
- Ix
- 143,000,000 mm⁴ (0.0%)
Source: Eurocode 3 UK National Annex and ArcelorMittal Sections 2026-1 · v2026.1 · Hot-finished hollow sections · Methodology