ST12×40 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.
ST12×40 measures 12 in. deep with a 7 in. flange, on a 1/2 in. web and 7/8 in. flanges.
At 40 lb per foot it is the lightest of the 5 ST12 sizes, which run from 40 to 60.5 lb/ft.
For strong-axis bending its section modulus is Sx = 18.6 in³ and its moment of inertia Ix = 162 in⁴, with a plastic modulus Zx = 33.6 in³.
Detailing dimensions
| Depth (d) | 12" |
|---|---|
| Flange width (bf) | 7" |
| Web thickness (tw) | 1/2" |
| Flange thickness (tf) | 7/8" |
| k (detailing) | 1 3/4" |
| Workable gage (g) | 4" |
Section properties
| Weight | 40 lb/ft |
|---|---|
| Area (A) | 11.7 in² |
| Ix | 162 in⁴ |
| Sx | 18.6 in³ |
| Zx | 33.6 in³ |
| rx | 3.72 in |
| Iy | 21 in⁴ |
| Sy | 6 in³ |
| Zy | 10.4 in³ |
| ry | 1.34 in |
| J | 2.44 in⁴ |
Other ST12 sizes
Same nominal size, different weight — useful when you are checking a substitution or a lighter section.
All ST12 sizes and dimensions →
Similar weight structural tees
Comparable 40 lb/ft sections in other tee sizes.
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 ST12×40 cut, formed, or fabricated? Huntington Steel & Supply Co.
Browse more: Tees · Steel Beam Size Chart