W30×391 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.
W30×391 measures 33 1/4 in. deep with a 15 5/8 in. flange, on a 1 3/8 in. web and 2 7/16 in. flanges.
At 391 lb per foot it is the heaviest of the 16 W30 sizes, which run from 90 to 391 lb/ft.
For strong-axis bending its section modulus is Sx = 1250 in³ and its moment of inertia Ix = 20700 in⁴, with a plastic modulus Zx = 1450 in³.
Detailing dimensions
| Depth (d) | 33 1/4" |
|---|---|
| Flange width (bf) | 15 5/8" |
| Web thickness (tw) | 1 3/8" |
| Flange thickness (tf) | 2 7/16" |
| k (detailing) | 3 3/4" |
| Workable gage (g) | 5 1/2" |
Section properties
| Weight | 391 lb/ft |
|---|---|
| Area (A) | 115 in² |
| Ix | 20700 in⁴ |
| Sx | 1250 in³ |
| Zx | 1450 in³ |
| rx | 13.4 in |
| Iy | 1550 in⁴ |
| Sy | 198 in³ |
| Zy | 310 in³ |
| ry | 3.67 in |
| J | 173 in⁴ |
Other W30 sizes
Same nominal size, different weight — useful when you are checking a substitution or a lighter section.
All W30 sizes and dimensions →
Similar weight wide-flange beams
Comparable 391 lb/ft sections in other wide-flange beam sizes.
Compare W30×391 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 W30×391 cut, formed, or fabricated? Huntington Steel & Supply Co.
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