Dimensions and section properties for W21X122
Structural sectional properties for a W21X122 standard steel section
US Customary Units
| Description | Symbol | Value |
|---|---|---|
| Shape Category / Designation | Type | W |
| Section Name | Name | W21X122 |
| Cross Sectional Area | A | 35.9 in2 |
| Section Width | b | 12.4 in |
| Section Depth | d | 21.7 in |
| Flange thickness | tf | 0.96 in |
| Web thickness | tw | 0.6 in |
| Radius of Gyration about X-X | rx | 9.09 in |
| Radius of Gyrations about Y-Y | ry | 2.92 in |
| Moment of Inertia about X-X | Ix | 2960 in4 |
| Moment of Intertia about Y-Y | Iy | 305 in4 |
| Elastic Section Modulus about X-X | Sx | 273 in3 |
| Elastic Section Modulus about Y-Y | Sy | 49.2 in3 |
| Plastic Section Modulus about X-X | Zx | 307 in3 |
| Plastic Section Modulus about Y-Y | Zy | 75.6 in3 |
| St. Venant Torsional Constant | J | 8.98 in4 |
| Warping Torsion Constant | Cw | 32700 in6 |
| Self Weight of section | Weight | 122 lb/ft |
Metric Units
| Description | Symbol | Value |
|---|---|---|
| Shape Category / Designation | Type | W |
| Section Name | Name | W21X122 |
| Cross Sectional Area | A | 23161 mm2 |
| Section Width | b | 315 mm |
| Section Depth | d | 551 mm |
| Flange thickness | tf | 24.4 mm |
| Web thickness | tw | 15.2 mm |
| Radius of Gyration about X-X | rx | 231 mm |
| Radius of Gyrations about Y-Y | ry | 74 mm |
| Moment of Inertia about X-X | Ix | 1232000000 mm4 |
| Moment of Intertia about Y-Y | Iy | 127000000 mm4 |
| Elastic Section Modulus about X-X | Sx | 4474000 mm3 |
| Elastic Section Modulus about Y-Y | Sy | 806000 mm3 |
| Plastic Section Modulus about X-X | Zx | 5031000 mm3 |
| Plastic Section Modulus about Y-Y | Zy | 1239000 mm3 |
| St. Venant Torsional Constant | J | 3738000 mm4 |
| Warping Torsion Constant | Cw | 8781000000000 mm6 |
| Self Weight of section | Weight | 182 kg/m |
Note: Metric units have been converted from tabulated imperial values and rounded to a reasonable number of significant figures.
A W21X122 steel section is a standard North American steel section in the W - Wide Flange category. The height and width of the section are 21.7 in (551 mm) and 12.4 in (315 mm) respectively. It weighs 122 lb/ft (182 kg/m) and has a cross sectional area of 35.9 in2 (23161 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