W36×318 vs W36×330
A side-by-side comparison of two AISC wide-flange beams, 16th Edition. Detailing dimensions to the nearest 1/16 in.
W36×330 is the heavier section at 330 lb per foot, versus 318 for W36×318 (12 lb/ft more).
Both are nominally 36 in. deep.
W36×330 has the greater bending strength: section modulus Sx of 1240 in³ versus 1110, about 12% more.
| Property | W36×318 | W36×330 |
|---|---|---|
| Weight | 318 lb/ft | 330 lb/ft |
| Depth (d) | 38 1/4" | 37 5/8" |
| Flange width (bf) | 12 3/8" | 16 5/8" |
| Web thickness (tw) | 1 3/16" | 1" |
| Flange thickness (tf) | 2 1/8" | 1 7/8" |
| Area (A) | 93.4 in² | 96.9 in² |
| Moment of inertia (Ix) | 21200 in⁴ | 23300 in⁴ |
| Section modulus (Sx) | 1110 in³ | 1240 in³ |
| Plastic modulus (Zx) | 1300 in³ | 1410 in³ |
Open W36×318 in the interactive size chart →
Full detail: W36×318 · W36×330. Verify critical dimensions against the current AISC Steel Construction Manual before fabrication.
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