W14×90 vs W14×99
A side-by-side comparison of two AISC wide-flange beams, 16th Edition. Detailing dimensions to the nearest 1/16 in.
W14×99 is the heavier section at 99 lb per foot, versus 90 for W14×90 (9 lb/ft more).
Both are nominally 14 in. deep.
W14×99 has the greater bending strength: section modulus Sx of 157 in³ versus 143, about 10% more.
| Property | W14×90 | W14×99 |
|---|---|---|
| Weight | 90 lb/ft | 99 lb/ft |
| Depth (d) | 14" | 14 1/8" |
| Flange width (bf) | 14 1/2" | 14 5/8" |
| Web thickness (tw) | 7/16" | 1/2" |
| Flange thickness (tf) | 11/16" | 3/4" |
| Area (A) | 26.5 in² | 29.1 in² |
| Moment of inertia (Ix) | 999 in⁴ | 1110 in⁴ |
| Section modulus (Sx) | 143 in³ | 157 in³ |
| Plastic modulus (Zx) | 157 in³ | 173 in³ |
Open W14×90 in the interactive size chart →
Full detail: W14×90 · W14×99. Verify critical dimensions against the current AISC Steel Construction Manual before fabrication.
Browse more: size comparisons · Steel Beam Size Chart