W21×166 vs W21×182
A side-by-side comparison of two AISC wide-flange beams, 16th Edition. Detailing dimensions to the nearest 1/16 in.
W21×182 is the heavier section at 182 lb per foot, versus 166 for W21×166 (16 lb/ft more).
Both are nominally 21 in. deep.
W21×182 has the greater bending strength: section modulus Sx of 417 in³ versus 380, about 10% more.
| Property | W21×166 | W21×182 |
|---|---|---|
| Weight | 166 lb/ft | 182 lb/ft |
| Depth (d) | 22 1/2" | 22 3/4" |
| Flange width (bf) | 12 3/8" | 12 1/2" |
| Web thickness (tw) | 3/4" | 13/16" |
| Flange thickness (tf) | 1 3/8" | 1 1/2" |
| Area (A) | 48.8 in² | 53.6 in² |
| Moment of inertia (Ix) | 4280 in⁴ | 4730 in⁴ |
| Section modulus (Sx) | 380 in³ | 417 in³ |
| Plastic modulus (Zx) | 432 in³ | 476 in³ |
Open W21×166 in the interactive size chart →
Full detail: W21×166 · W21×182. Verify critical dimensions against the current AISC Steel Construction Manual before fabrication.
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