W33×318 wide-flange beam
Detailing dimensions and section properties from the AISC Shapes Database, 16th Edition. Values are shown to the nearest 1/16 in. as they appear on a shop drawing.
W33×318 measures 35 1/8 in. deep with a 16 in. flange, on a 1 1/16 in. web and 1 7/8 in. flanges.
At 318 lb per foot it is one of the 13 W33 sizes, which run from 118 to 387 lb/ft.
For strong-axis bending its section modulus is Sx = 1110 in³ and its moment of inertia Ix = 19500 in⁴, with a plastic modulus Zx = 1270 in³.
Detailing dimensions
| Depth (d) | 35 1/8" |
|---|---|
| Flange width (bf) | 16" |
| Web thickness (tw) | 1 1/16" |
| Flange thickness (tf) | 1 7/8" |
| k (detailing) | 3 3/16" |
| Workable gage (g) | 5 1/2" |
Section properties
| Weight | 318 lb/ft |
|---|---|
| Area (A) | 93.7 in² |
| Ix | 19500 in⁴ |
| Sx | 1110 in³ |
| Zx | 1270 in³ |
| rx | 14.5 in |
| Iy | 1290 in⁴ |
| Sy | 161 in³ |
| Zy | 250 in³ |
| ry | 3.71 in |
| J | 84.4 in⁴ |
Other W33 sizes
Same nominal size, different weight — useful when you are checking a substitution or a lighter section.
All W33 sizes and dimensions →
Similar weight wide-flange beams
Comparable 318 lb/ft sections in other wide-flange beam sizes.
Compare W33×318 with a nearby size
Detailing values are rounded to the nearest 1/16 in. per the AISC Steel Construction Manual. Verify critical dimensions against the current Manual before fabrication. Need W33×318 cut, formed, or fabricated? Huntington Steel & Supply Co.
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