W21×111 vs W21×122
A side-by-side comparison of two AISC wide-flange beams, 16th Edition. Detailing dimensions to the nearest 1/16 in.
W21×122 is the heavier section at 122 lb per foot, versus 111 for W21×111 (11 lb/ft more).
Both are nominally 21 in. deep.
W21×122 has the greater bending strength: section modulus Sx of 273 in³ versus 249, about 10% more.
| Property | W21×111 | W21×122 |
|---|---|---|
| Weight | 111 lb/ft | 122 lb/ft |
| Depth (d) | 21 1/2" | 21 5/8" |
| Flange width (bf) | 12 3/8" | 12 3/8" |
| Web thickness (tw) | 9/16" | 5/8" |
| Flange thickness (tf) | 7/8" | 15/16" |
| Area (A) | 32.6 in² | 35.9 in² |
| Moment of inertia (Ix) | 2670 in⁴ | 2960 in⁴ |
| Section modulus (Sx) | 249 in³ | 273 in³ |
| Plastic modulus (Zx) | 279 in³ | 307 in³ |
Open W21×111 in the interactive size chart →
Full detail: W21×111 · W21×122. Verify critical dimensions against the current AISC Steel Construction Manual before fabrication.
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