W21×83 vs W21×93
A side-by-side comparison of two AISC wide-flange beams, 16th Edition. Detailing dimensions to the nearest 1/16 in.
W21×93 is the heavier section at 93 lb per foot, versus 83 for W21×83 (10 lb/ft more).
Both are nominally 21 in. deep.
W21×93 has the greater bending strength: section modulus Sx of 192 in³ versus 171, about 12% more.
| Property | W21×83 | W21×93 |
|---|---|---|
| Weight | 83 lb/ft | 93 lb/ft |
| Depth (d) | 21 3/8" | 21 5/8" |
| Flange width (bf) | 8 3/8" | 8 3/8" |
| Web thickness (tw) | 1/2" | 9/16" |
| Flange thickness (tf) | 13/16" | 15/16" |
| Area (A) | 24.4 in² | 27.3 in² |
| Moment of inertia (Ix) | 1830 in⁴ | 2070 in⁴ |
| Section modulus (Sx) | 171 in³ | 192 in³ |
| Plastic modulus (Zx) | 196 in³ | 221 in³ |
Open W21×83 in the interactive size chart →
Full detail: W21×83 · W21×93. Verify critical dimensions against the current AISC Steel Construction Manual before fabrication.
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