StructureCalcsC8X18.75
American Standard Channel · AISC Shapes Database v15.0 · United States
C8X18.75 is an American Standard channel 203.2 mm deep with a 64.3 mm wide flange, weighing 27.9 kg/m. The dimensions below are the published AISC Shapes Database v15.0 values; the drawing is generated from them.
C-shapes are American Standard channels with tapered flanges — stringers, purlins and frames where a single flat back face is wanted.
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Published dimensions
| Property | Metric | Imperial |
|---|---|---|
| Depth, d | 203.2 mm | 8.00 in |
| Flange width, bf | 64.3 mm | 2.53 in |
| Flange thickness, tf | 9.9 mm | 0.390 in |
| Web thickness, tw | 12.4 mm | 0.487 in |
| Mass per metre | 27.9 kg/m | 18.7 lb/ft |
| Area, A | 3,555 mm² | 5.51 in² |
| Second moment, Ix | 18,272,560 mm⁴ | 43.9 in⁴ |
| Second moment, Iy | 819,976 mm⁴ | 2.0 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 C8X18.75 the computed area agrees with the published value to 0.01% and Ix to 0.14%. Where a value is also published, the published one above is the one to quote.
| Property | Value |
|---|---|
| Elastic modulus, Sx | 180,097 mm³ |
| Elastic modulus, Sy | 16,753 mm³ |
| Plastic modulus, Zx | 227,848 mm³ |
| Plastic modulus, Zy | 35,696 mm³ |
| Radius of gyration, rx | 71.7 mm |
| Radius of gyration, ry | 15.3 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