W30×173 vs W30×191
A side-by-side comparison of two AISC wide-flange beams, 16th Edition. Detailing dimensions to the nearest 1/16 in.
W30×191 is the heavier section at 191 lb per foot, versus 173 for W30×173 (18 lb/ft more).
Both are nominally 30 in. deep.
W30×191 has the greater bending strength: section modulus Sx of 600 in³ versus 541, about 11% more.
| Property | W30×173 | W30×191 |
|---|---|---|
| Weight | 173 lb/ft | 191 lb/ft |
| Depth (d) | 30 1/2" | 30 5/8" |
| Flange width (bf) | 15" | 15" |
| Web thickness (tw) | 5/8" | 11/16" |
| Flange thickness (tf) | 1 1/16" | 1 3/16" |
| Area (A) | 50.9 in² | 56.1 in² |
| Moment of inertia (Ix) | 8230 in⁴ | 9200 in⁴ |
| Section modulus (Sx) | 541 in³ | 600 in³ |
| Plastic modulus (Zx) | 607 in³ | 675 in³ |
Open W30×173 in the interactive size chart →
Full detail: W30×173 · W30×191. Verify critical dimensions against the current AISC Steel Construction Manual before fabrication.
Browse more: size comparisons · Steel Beam Size Chart