W12×45 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.

W12×45 measures 12 in. deep with a 8 in. flange, on a 5/16 in. web and 9/16 in. flanges.

At 45 lb per foot it is one of the 29 W12 sizes, which run from 14 to 336 lb/ft.

For strong-axis bending its section modulus is Sx = 57.7 in³ and its moment of inertia Ix = 348 in⁴, with a plastic modulus Zx = 64.2 in³.

Detailing dimensions

Depth (d)12"
Flange width (bf)8"
Web thickness (tw)5/16"
Flange thickness (tf)9/16"
k (detailing)1 3/8"
Workable gage (g)5 1/2"

Section properties

Weight45 lb/ft
Area (A)13.1 in²
Ix348 in⁴
Sx57.7 in³
Zx64.2 in³
rx5.15 in
Iy50 in⁴
Sy12.4 in³
Zy19 in³
ry1.95 in
J1.26 in⁴

Other W12 sizes

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

W12×14W12×16W12×19W12×22W12×26W12×30W12×35W12×40W12×50W12×53W12×58W12×65W12×72W12×79W12×87W12×96W12×106W12×120W12×136W12×152W12×170W12×190W12×210W12×230

All W12 sizes and dimensions →

Similar weight wide-flange beams

Comparable 45 lb/ft sections in other wide-flange beam sizes.

W16×4545 lb/ft · Sx 72.7 in³W10×4545 lb/ft · Sx 49.1 in³W21×4444 lb/ft · Sx 81.6 in³W18×4646 lb/ft · Sx 78.8 in³W14×4343 lb/ft · Sx 62.6 in³W21×4848 lb/ft · Sx 93 in³W14×4848 lb/ft · Sx 70.2 in³W8×4848 lb/ft · Sx 43.2 in³

Compare W12×45 with a nearby size

W12×40 vs W12×45W12×45 vs W12×50W10×45 vs W12×45W12×45 vs W16×45

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 W12×45 cut, formed, or fabricated? Huntington Steel & Supply Co.

Browse more: Wide flange beams · Steel Beam Size Chart

Interactive drawing