W21×248 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.
W21×248 measures 23 3/4 in. deep with a 12 3/4 in. flange, on a 1 1/8 in. web and 2 in. flanges.
At 248 lb per foot it is one of the 21 W21 sizes, which run from 44 to 275 lb/ft.
For strong-axis bending its section modulus is Sx = 576 in³ and its moment of inertia Ix = 6830 in⁴, with a plastic modulus Zx = 671 in³.
Detailing dimensions
| Depth (d) | 23 3/4" |
|---|---|
| Flange width (bf) | 12 3/4" |
| Web thickness (tw) | 1 1/8" |
| Flange thickness (tf) | 2" |
| k (detailing) | 3 1/4" |
| Workable gage (g) | 5 1/2" |
Section properties
| Weight | 248 lb/ft |
|---|---|
| Area (A) | 73.8 in² |
| Ix | 6830 in⁴ |
| Sx | 576 in³ |
| Zx | 671 in³ |
| rx | 9.62 in |
| Iy | 699 in⁴ |
| Sy | 109 in³ |
| Zy | 170 in³ |
| ry | 3.08 in |
| J | 80.7 in⁴ |
Other W21 sizes
Same nominal size, different weight — useful when you are checking a substitution or a lighter section.
All W21 sizes and dimensions →
Similar weight wide-flange beams
Comparable 248 lb/ft sections in other wide-flange beam sizes.
Compare W21×248 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 W21×248 cut, formed, or fabricated? Huntington Steel & Supply Co.
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