ST12×45 tee (cut from a 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.

ST12×45 measures 12 in. deep with a 7 1/8 in. flange, on a 5/8 in. web and 7/8 in. flanges.

At 45 lb per foot it is one of the 5 ST12 sizes, which run from 40 to 60.5 lb/ft.

For strong-axis bending its section modulus is Sx = 22.6 in³ and its moment of inertia Ix = 190 in⁴, with a plastic modulus Zx = 41.1 in³.

Detailing dimensions

Depth (d)12"
Flange width (bf)7 1/8"
Web thickness (tw)5/8"
Flange thickness (tf)7/8"
k (detailing)1 3/4"
Workable gage (g)4"

Section properties

Weight45 lb/ft
Area (A)13.2 in²
Ix190 in⁴
Sx22.6 in³
Zx41.1 in³
rx3.79 in
Iy22.3 in⁴
Sy6.27 in³
Zy11.2 in³
ry1.3 in
J3.01 in⁴

Other ST12 sizes

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

ST12×40ST12×50ST12×53ST12×60.5

All ST12 sizes and dimensions →

Similar weight structural tees

Comparable 45 lb/ft sections in other tee sizes.

WT15×4545 lb/ft · Sx 27.1 in³WT7×4545 lb/ft · Sx 6.16 in³WT8×44.544.5 lb/ft · Sx 10.1 in³WT5×4444 lb/ft · Sx 4.77 in³WT6×43.543.5 lb/ft · Sx 5.6 in³WT10.5×46.546.5 lb/ft · Sx 17.9 in³WT9×4343 lb/ft · Sx 11.2 in³ST10×4343 lb/ft · Sx 17.2 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 ST12×45 cut, formed, or fabricated? Huntington Steel & Supply Co.

Browse more: Tees · Steel Beam Size Chart

Interactive drawing