W21X57
Wide-Flange Beam · AISC Shapes Database v15.0 · United States
W21X57 is a wide-flange beam 535.9 mm deep with a 166.6 mm flange, weighing 84.8 kg/m. The dimensions below are the published AISC Shapes Database v15.0 values; the drawing is generated from them.
Analyse this section, or combine it with plates and other shapes.
Open W21X57 in the Section CalculatorFree, no sign-up, runs in your browser.
Published dimensions
| Property | Metric | Imperial |
|---|---|---|
| Depth, d | 535.9 mm | 21.10 in |
| Flange width, bf | 166.6 mm | 6.56 in |
| Flange thickness, tf | 16.5 mm | 0.650 in |
| Web thickness, tw | 10.3 mm | 0.405 in |
| Mass per metre | 84.8 kg/m | 57.0 lb/ft |
| Area, A | 10,774 mm² | 16.70 in² |
| Second moment, Ix | 486,990,768 mm⁴ | 1,170.0 in⁴ |
| Second moment, Iy | 12,736,682 mm⁴ | 30.6 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 W21X57 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, Zx | 1,814,727 mm³ |
| Elastic modulus, Zy | 153,403 mm³ |
| Plastic modulus, Sx | 2,103,582 mm³ |
| Plastic modulus, Sy | 243,215 mm³ |
| Radius of gyration, rx | 212.5 mm |
| Radius of gyration, ry | 34.4 mm |
Z is the elastic modulus and S the plastic modulus, following AS 4100. Under AISC 360 the letters are reversed — S is elastic and Z is plastic.
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