W8×13 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.

W8×13 measures 8 in. deep with a 4 in. flange, on a 1/4 in. web and 1/4 in. flanges.

At 13 lb per foot it is one of the 13 W8 sizes, which run from 10 to 67 lb/ft.

For strong-axis bending its section modulus is Sx = 9.91 in³ and its moment of inertia Ix = 39.6 in⁴, with a plastic modulus Zx = 11.4 in³.

Detailing dimensions

Depth (d)8"
Flange width (bf)4"
Web thickness (tw)1/4"
Flange thickness (tf)1/4"
k (detailing)3/4"
Workable gage (g)2 1/4"

Section properties

Weight13 lb/ft
Area (A)3.84 in²
Ix39.6 in⁴
Sx9.91 in³
Zx11.4 in³
rx3.21 in
Iy2.73 in⁴
Sy1.37 in³
Zy2.15 in³
ry0.843 in
J0.0871 in⁴

Other W8 sizes

Same nominal size, different weight — useful when you are checking a substitution or a lighter section.

W8×10W8×15W8×18W8×21W8×24W8×28W8×31W8×35W8×40W8×48W8×58W8×67

All W8 sizes and dimensions →

Similar weight wide-flange beams

Comparable 13 lb/ft sections in other wide-flange beam sizes.

W4×1313 lb/ft · Sx 5.46 in³W10×1212 lb/ft · Sx 10.9 in³W6×1212 lb/ft · Sx 7.31 in³W12×1414 lb/ft · Sx 14.9 in³W10×1515 lb/ft · Sx 13.8 in³W6×1515 lb/ft · Sx 9.72 in³W12×1616 lb/ft · Sx 17.1 in³W6×1616 lb/ft · Sx 10.2 in³

Compare W8×13 with a nearby size

W8×10 vs W8×13W8×13 vs W8×15W4×13 vs W8×13

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 W8×13 cut, formed, or fabricated? Huntington Steel & Supply Co.

Browse more: Wide flange beams · Steel Beam Size Chart

Interactive drawing