W21×101 vs W21×111
A side-by-side comparison of two AISC wide-flange beams, 16th Edition. Detailing dimensions to the nearest 1/16 in.
W21×111 is the heavier section at 111 lb per foot, versus 101 for W21×101 (10 lb/ft more).
Both are nominally 21 in. deep.
W21×111 has the greater bending strength: section modulus Sx of 249 in³ versus 227, about 10% more.
| Property | W21×101 | W21×111 |
|---|---|---|
| Weight | 101 lb/ft | 111 lb/ft |
| Depth (d) | 21 3/8" | 21 1/2" |
| Flange width (bf) | 12 1/4" | 12 3/8" |
| Web thickness (tw) | 1/2" | 9/16" |
| Flange thickness (tf) | 13/16" | 7/8" |
| Area (A) | 29.8 in² | 32.6 in² |
| Moment of inertia (Ix) | 2420 in⁴ | 2670 in⁴ |
| Section modulus (Sx) | 227 in³ | 249 in³ |
| Plastic modulus (Zx) | 253 in³ | 279 in³ |
Open W21×101 in the interactive size chart →
Full detail: W21×101 · W21×111. Verify critical dimensions against the current AISC Steel Construction Manual before fabrication.
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