Dimensions and section properties for W21X57
Structural sectional properties for a W21X57 standard steel section
US Customary Units
| Description | Symbol | Value |
|---|---|---|
| Shape Category / Designation | Type | W |
| Section Name | Name | W21X57 |
| Cross Sectional Area | A | 16.7 in2 |
| Section Width | b | 6.56 in |
| Section Depth | d | 21.1 in |
| Flange thickness | tf | 0.65 in |
| Web thickness | tw | 0.405 in |
| Radius of Gyration about X-X | rx | 8.36 in |
| Radius of Gyrations about Y-Y | ry | 1.35 in |
| Moment of Inertia about X-X | Ix | 1170 in4 |
| Moment of Intertia about Y-Y | Iy | 30.6 in4 |
| Elastic Section Modulus about X-X | Sx | 111 in3 |
| Elastic Section Modulus about Y-Y | Sy | 9.35 in3 |
| Plastic Section Modulus about X-X | Zx | 129 in3 |
| Plastic Section Modulus about Y-Y | Zy | 14.8 in3 |
| St. Venant Torsional Constant | J | 1.77 in4 |
| Warping Torsion Constant | Cw | 3190 in6 |
| Self Weight of section | Weight | 57 lb/ft |
Metric Units
| Description | Symbol | Value |
|---|---|---|
| Shape Category / Designation | Type | W |
| Section Name | Name | W21X57 |
| Cross Sectional Area | A | 10774 mm2 |
| Section Width | b | 167 mm |
| Section Depth | d | 536 mm |
| Flange thickness | tf | 16.5 mm |
| Web thickness | tw | 10.3 mm |
| Radius of Gyration about X-X | rx | 212 mm |
| Radius of Gyrations about Y-Y | ry | 34 mm |
| Moment of Inertia about X-X | Ix | 487000000 mm4 |
| Moment of Intertia about Y-Y | Iy | 13000000 mm4 |
| Elastic Section Modulus about X-X | Sx | 1819000 mm3 |
| Elastic Section Modulus about Y-Y | Sy | 153000 mm3 |
| Plastic Section Modulus about X-X | Zx | 2114000 mm3 |
| Plastic Section Modulus about Y-Y | Zy | 243000 mm3 |
| St. Venant Torsional Constant | J | 737000 mm4 |
| Warping Torsion Constant | Cw | 857000000000 mm6 |
| Self Weight of section | Weight | 85 kg/m |
Note: Metric units have been converted from tabulated imperial values and rounded to a reasonable number of significant figures.
A W21X57 steel section is a standard North American steel section in the W - Wide Flange category. The height and width of the section are 21.1 in (536 mm) and 6.56 in (167 mm) respectively. It weighs 57 lb/ft (85 kg/m) and has a cross sectional area of 16.7 in2 (10774 mm2).
The section has a tensile yield capacity of:
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The section has a flexural plastic moment capacity of:
kip-ft
The section has a flexural elastic moment capacity of:
kip-ft