Steel Beam Sizes / AISC / ST Tees / ST6x20.4
ST6x20.4 Steel Beam Dimensions and Properties
AISC American standard tees · v16.0
Diagram, properties emphasis, and nearby alternatives use the selected unit system.
Section diagram
ST6x20.4 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 | 20.40 lb/ft | 30.40 kg/m |
| Depth, d | 6.00 in | 152.00 mm |
| Flange width, bf | 5.25 in | 133.00 mm |
| tw | 0.462 in | 11.700 mm |
| tf | 0.659 in | 16.700 mm |
| Area | 5.96 in² | 3,850.00 mm² |
| Ix | 18.90 in⁴ | 7,870,000 mm⁴ |
| Iy | 6.74 in⁴ | 2,810,000 mm⁴ |
| Sx | 4.27 in³ | 70,000.00 mm³ |
| Sy | 2.57 in³ | 42,100.00 mm³ |
| Zx | 7.71 in³ | 126,000.00 mm³ |
| Zy | 4.43 in³ | 72,600.00 mm³ |
| rx | 1.78 in | 45.20 mm |
| ry | 1.06 in | 26.90 mm |
| J | 0.84 in⁴ | 350,000.00 mm⁴ |
| Cw | 0.79 in⁶ | 211,000,000 mm⁶ |
Alternatives
Useful nearby sections
Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus ST6x20.4.
Lighter in ST6
ST6x17.5
- Weight
- 17.5 lb/ft (-14%)
- Depth
- 6.00 in (0.0%)
- Ix
- 17.2 in⁴ (-9.0%)
Heavier in ST6
ST6x25
- Weight
- 25.0 lb/ft (+23%)
- Depth
- 6.00 in (0.0%)
- Ix
- 25.1 in⁴ (+33%)
Closest Iₓ in ST6
ST6x15.9
- Weight
- 15.9 lb/ft (-22%)
- Depth
- 6.00 in (0.0%)
- Ix
- 14.8 in⁴ (-22%)
Similar weight in ST7
ST7.5x21.45
- Weight
- 21.5 lb/ft (+5.1%)
- Depth
- 7.50 in (+25%)
- Ix
- 32.9 in⁴ (+74%)
Source: AISC Shapes Database v16.0 · Methodology