StructureCalcsM5X18.9
Miscellaneous Beam · AISC Shapes Database v15.0 · United States
M5X18.9 is a miscellaneous light beam 127.0 mm deep with a 127.0 mm wide flange, weighing 28.1 kg/m. The dimensions below are the published AISC Shapes Database v15.0 values; the drawing is generated from them.
M-shapes are light I-sections that fall outside the W series — small beams for light framing.
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Published dimensions
| Property | Metric | Imperial |
|---|---|---|
| Depth, d | 127.0 mm | 5.00 in |
| Flange width, bf | 127.0 mm | 5.00 in |
| Flange thickness, tf | 10.6 mm | 0.416 in |
| Web thickness, tw | 8.0 mm | 0.316 in |
| Mass per metre | 28.1 kg/m | 18.9 lb/ft |
| Area, A | 3,587 mm² | 5.56 in² |
| Second moment, Ix | 10,072,801 mm⁴ | 24.2 in⁴ |
| Second moment, Iy | 3,621,213 mm⁴ | 8.7 in⁴ |
Derived section properties
Integrated from the section's own outline including the root and toe radii, whose arcs are integrated analytically rather than approximated by facets. For M5X18.9 the computed area agrees with the published value to better than 0.01% and Ix to 0.18%. Where a value is also published, the published one above is the one to quote.
| Property | Value |
|---|---|
| Elastic modulus, Sx | 158,338 mm³ |
| Elastic modulus, Sy | 56,929 mm³ |
| Plastic modulus, Zx | 181,464 mm³ |
| Plastic modulus, Zy | 87,249 mm³ |
| Radius of gyration, rx | 52.9 mm |
| Radius of gyration, ry | 31.7 mm |
S is the elastic modulus and Z the plastic modulus, following AISC 360. Australian and British practice reverse the letters.
Neighbouring sizes
Where these numbers come from
Published AISC Shapes Database v15.0 values. How StructureCalcs verifies its numbers · Understanding steel section properties · Query this section over the API