Steel Beam Sizes / CISC / M-Shapes / M318×18.5
M318×18.5 Steel Beam Dimensions and Properties
CISC Miscellaneous beams · v12.1
Diagram, properties emphasis, and nearby alternatives use the selected unit system.
Section diagram
M318×18.5 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 | 12.40 lb/ft | 18.50 kg/m |
| Depth, d | 12.52 in | 318.00 mm |
| Flange width, bf | 3.74 in | 95.00 mm |
| tw | 0.154 in | 3.900 mm |
| tf | 0.228 in | 5.800 mm |
| Area | 3.61 in² | 2,330.00 mm² |
| Ix | 88.89 in⁴ | 37,000,000 mm⁴ |
| Iy | 1.99 in⁴ | 830,000.00 mm⁴ |
| Sx | 14.22 in³ | 233,000.00 mm³ |
| Sy | 1.07 in³ | 17,500.00 mm³ |
| Zx | 16.42 in³ | 269,000.00 mm³ |
| Zy | 1.67 in³ | 27,300.00 mm³ |
| rx | 4.96 in | 126.00 mm |
| ry | 0.74 in | 18.90 mm |
| J | 0.05 in⁴ | 20,500.00 mm⁴ |
| Cw | 75.22 in⁶ | 20,200,000,000 mm⁶ |
Alternatives
Useful nearby sections
Same-series weight neighbors, closest Ix, and a nearby depth series when available — with percent change versus M318×18.5.
Source: CISC Structural Section Tables SST12.1 · v12.1 · Availability: Not produced in Canada. · Methodology