W18×130 vs W33×130
A side-by-side comparison of two AISC wide-flange beams, 16th Edition. Detailing dimensions to the nearest 1/16 in.
W18×130 and W33×130 both weigh 130 lb per foot, so the choice comes down to depth and stiffness rather than weight.
W33×130 is the deeper section at a nominal 33 in., versus 18 in.
W33×130 has the greater bending strength: section modulus Sx of 406 in³ versus 256, about 59% more.
| Property | W18×130 | W33×130 |
|---|---|---|
| Weight | 130 lb/ft | 130 lb/ft |
| Depth (d) | 19 1/4" | 33 1/8" |
| Flange width (bf) | 11 1/8" | 11 1/2" |
| Web thickness (tw) | 11/16" | 9/16" |
| Flange thickness (tf) | 1 3/16" | 7/8" |
| Area (A) | 38.3 in² | 38.3 in² |
| Moment of inertia (Ix) | 2460 in⁴ | 6710 in⁴ |
| Section modulus (Sx) | 256 in³ | 406 in³ |
| Plastic modulus (Zx) | 290 in³ | 467 in³ |
Open W18×130 in the interactive size chart →
Full detail: W18×130 · W33×130. Verify critical dimensions against the current AISC Steel Construction Manual before fabrication.
Browse more: size comparisons · Steel Beam Size Chart