W21×201 vs W33×201
A side-by-side comparison of two AISC wide-flange beams, 16th Edition. Detailing dimensions to the nearest 1/16 in.
W21×201 and W33×201 both weigh 201 lb per foot, so the choice comes down to depth and stiffness rather than weight.
W33×201 is the deeper section at a nominal 33 in., versus 21 in.
W33×201 has the greater bending strength: section modulus Sx of 686 in³ versus 461, about 49% more.
| Property | W21×201 | W33×201 |
|---|---|---|
| Weight | 201 lb/ft | 201 lb/ft |
| Depth (d) | 23" | 33 5/8" |
| Flange width (bf) | 12 5/8" | 15 3/4" |
| Web thickness (tw) | 15/16" | 11/16" |
| Flange thickness (tf) | 1 5/8" | 1 1/8" |
| Area (A) | 59.3 in² | 59.1 in² |
| Moment of inertia (Ix) | 5310 in⁴ | 11600 in⁴ |
| Section modulus (Sx) | 461 in³ | 686 in³ |
| Plastic modulus (Zx) | 530 in³ | 773 in³ |
Open W21×201 in the interactive size chart →
Full detail: W21×201 · W33×201. Verify critical dimensions against the current AISC Steel Construction Manual before fabrication.
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