StructureCalcsS20X66
American Standard Beam · AISC Shapes Database v15.0 · United States
S20X66 is an American Standard beam 508.0 mm deep with a 159.0 mm wide flange, weighing 98.2 kg/m. The dimensions below are the published AISC Shapes Database v15.0 values; the drawing is generated from them.
S-shapes are American Standard beams with narrow, tapered flanges — the oldest rolled I-profile in the catalogue, still used for crane rails and work on older structures.
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Published dimensions
| Property | Metric | Imperial |
|---|---|---|
| Depth, d | 508.0 mm | 20.00 in |
| Flange width, bf | 159.0 mm | 6.26 in |
| Flange thickness, tf | 20.2 mm | 0.795 in |
| Web thickness, tw | 12.8 mm | 0.505 in |
| Mass per metre | 98.2 kg/m | 66.0 lb/ft |
| Area, A | 12,516 mm² | 19.40 in² |
| Second moment, Ix | 495,315,397 mm⁴ | 1,190.0 in⁴ |
| Second moment, Iy | 11,446,364 mm⁴ | 27.5 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 S20X66 the computed area agrees with the published value to better than 0.01% and Ix to 0.05%. Where a value is also published, the published one above is the one to quote.
| Property | Value |
|---|---|
| Elastic modulus, Sx | 1,950,954 mm³ |
| Elastic modulus, Sy | 147,836 mm³ |
| Plastic modulus, Zx | 2,287,226 mm³ |
| Plastic modulus, Zy | 253,610 mm³ |
| Radius of gyration, rx | 199.0 mm |
| Radius of gyration, ry | 30.6 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