W18×65 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.

W18×65 measures 18 3/8 in. deep with a 7 5/8 in. flange, on a 7/16 in. web and 3/4 in. flanges.

At 65 lb per foot it is one of the 23 W18 sizes, which run from 35 to 311 lb/ft.

For strong-axis bending its section modulus is Sx = 117 in³ and its moment of inertia Ix = 1070 in⁴, with a plastic modulus Zx = 133 in³.

Detailing dimensions

Depth (d)18 3/8"
Flange width (bf)7 5/8"
Web thickness (tw)7/16"
Flange thickness (tf)3/4"
k (detailing)1 7/16"
Workable gage (g)3 1/2"

Section properties

Weight65 lb/ft
Area (A)19.1 in²
Ix1070 in⁴
Sx117 in³
Zx133 in³
rx7.49 in
Iy54.8 in⁴
Sy14.4 in³
Zy22.5 in³
ry1.69 in
J2.73 in⁴

Other W18 sizes

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

W18×35W18×40W18×46W18×50W18×55W18×60W18×71W18×76W18×86W18×97W18×106W18×119W18×130W18×143W18×158W18×175W18×192W18×211W18×234W18×258W18×283W18×311

All W18 sizes and dimensions →

Similar weight wide-flange beams

Comparable 65 lb/ft sections in other wide-flange beam sizes.

W12×6565 lb/ft · Sx 87.9 in³W16×6767 lb/ft · Sx 117 in³W8×6767 lb/ft · Sx 60.4 in³W24×6262 lb/ft · Sx 131 in³W21×6262 lb/ft · Sx 127 in³W24×6868 lb/ft · Sx 154 in³W21×6868 lb/ft · Sx 140 in³W14×6868 lb/ft · Sx 103 in³

Compare W18×65 with a nearby size

W18×60 vs W18×65W18×65 vs W18×71W12×65 vs W18×65

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 W18×65 cut, formed, or fabricated? Huntington Steel & Supply Co.

Browse more: Wide flange beams · Steel Beam Size Chart

Interactive drawing