Dimensions and section properties for W21X68
Structural sectional properties for a W21X68 standard steel section
US Customary Units
| Description | Symbol | Value |
|---|---|---|
| Shape Category / Designation | Type | W |
| Section Name | Name | W21X68 |
| Cross Sectional Area | A | 20 in2 |
| Section Width | b | 8.27 in |
| Section Depth | d | 21.1 in |
| Flange thickness | tf | 0.685 in |
| Web thickness | tw | 0.43 in |
| Radius of Gyration about X-X | rx | 8.6 in |
| Radius of Gyrations about Y-Y | ry | 1.8 in |
| Moment of Inertia about X-X | Ix | 1480 in4 |
| Moment of Intertia about Y-Y | Iy | 64.7 in4 |
| Elastic Section Modulus about X-X | Sx | 140 in3 |
| Elastic Section Modulus about Y-Y | Sy | 15.7 in3 |
| Plastic Section Modulus about X-X | Zx | 160 in3 |
| Plastic Section Modulus about Y-Y | Zy | 24.4 in3 |
| St. Venant Torsional Constant | J | 2.45 in4 |
| Warping Torsion Constant | Cw | 6760 in6 |
| Self Weight of section | Weight | 68 lb/ft |
Metric Units
| Description | Symbol | Value |
|---|---|---|
| Shape Category / Designation | Type | W |
| Section Name | Name | W21X68 |
| Cross Sectional Area | A | 12903 mm2 |
| Section Width | b | 210 mm |
| Section Depth | d | 536 mm |
| Flange thickness | tf | 17.4 mm |
| Web thickness | tw | 10.9 mm |
| Radius of Gyration about X-X | rx | 218 mm |
| Radius of Gyrations about Y-Y | ry | 46 mm |
| Moment of Inertia about X-X | Ix | 616000000 mm4 |
| Moment of Intertia about Y-Y | Iy | 27000000 mm4 |
| Elastic Section Modulus about X-X | Sx | 2294000 mm3 |
| Elastic Section Modulus about Y-Y | Sy | 257000 mm3 |
| Plastic Section Modulus about X-X | Zx | 2622000 mm3 |
| Plastic Section Modulus about Y-Y | Zy | 400000 mm3 |
| St. Venant Torsional Constant | J | 1020000 mm4 |
| Warping Torsion Constant | Cw | 1815000000000 mm6 |
| Self Weight of section | Weight | 101 kg/m |
Note: Metric units have been converted from tabulated imperial values and rounded to a reasonable number of significant figures.
A W21X68 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 8.27 in (210 mm) respectively. It weighs 68 lb/ft (101 kg/m) and has a cross sectional area of 20 in2 (12903 mm2).
The section has a tensile yield capacity of:
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The section has a flexural plastic moment capacity of:
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The section has a flexural elastic moment capacity of:
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