S24×121 standard 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.

S24×121 measures 24 1/2 in. deep with a 8 in. flange, on a 13/16 in. web and 1 1/16 in. flanges.

At 121 lb per foot it is the heaviest of the 5 S24 sizes, which run from 80 to 121 lb/ft.

For strong-axis bending its section modulus is Sx = 258 in³ and its moment of inertia Ix = 3160 in⁴, with a plastic modulus Zx = 306 in³.

Detailing dimensions

Depth (d)24 1/2"
Flange width (bf)8"
Web thickness (tw)13/16"
Flange thickness (tf)1 1/16"
k (detailing)2"
Workable gage (g)4"

Section properties

Weight121 lb/ft
Area (A)35.5 in²
Ix3160 in⁴
Sx258 in³
Zx306 in³
rx9.43 in
Iy83 in⁴
Sy20.6 in³
Zy36.3 in³
ry1.53 in
J12.8 in⁴

Other S24 sizes

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

S24×80S24×90S24×100S24×106

Similar weight standard beams

Comparable 121 lb/ft sections in other standard beam sizes.

S20×9696 lb/ft · Sx 165 in³S20×8686 lb/ft · Sx 155 in³S20×7575 lb/ft · Sx 128 in³S18×7070 lb/ft · Sx 103 in³S20×6666 lb/ft · Sx 119 in³S18×54.754.7 lb/ft · Sx 89 in³S15×5050 lb/ft · Sx 64.7 in³S12×5050 lb/ft · Sx 50.6 in³

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 S24×121 cut, formed, or fabricated? Huntington Steel & Supply Co.

Browse more: Standard beams · Steel Beam Size Chart

Interactive drawing