StructureCalcsST7.5X21.45
Structural Tee (from S) · AISC Shapes Database v15.0 · United States
ST7.5X21.45 is a structural tee cut from an S-shape 190.5 mm deep with a 139.7 mm wide flange, weighing 31.9 kg/m. The dimensions below are the published AISC Shapes Database v15.0 values; the drawing is generated from them.
ST tees are cut from S-shapes and inherit the parent’s tapered flange, which the drawing here reproduces.
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Published dimensions
| Property | Metric | Imperial |
|---|---|---|
| Depth, d | 190.5 mm | 7.50 in |
| Flange width, bf | 139.7 mm | 5.50 in |
| Flange thickness, tf | 15.8 mm | 0.622 in |
| Web thickness, tw | 10.4 mm | 0.411 in |
| Mass per metre | 31.9 kg/m | 21.4 lb/ft |
| Area, A | 4,065 mm² | 6.30 in² |
| Second moment, Ix | 13,694,014 mm⁴ | 32.9 in⁴ |
| Second moment, Iy | 2,967,730 mm⁴ | 7.1 in⁴ |
Derived section properties
Integrated from a square-cornered outline — the fillet radii this family really has are not drawn, so the computed values differ slightly from published. For ST7.5X21.45 the computed area is 0.82% from published and Ix 0.05%. Where a value is also published, the published one above is the one to quote.
| Property | Value |
|---|---|
| Elastic modulus, Sx | 98,321 mm³ |
| Elastic modulus, Sy | 43,570 mm³ |
| Plastic modulus, Zx | 176,748 mm³ |
| Plastic modulus, Zy | 74,350 mm³ |
| Radius of gyration, rx | 58.3 mm |
| Radius of gyration, ry | 27.5 mm |
S is the elastic modulus and Z the plastic modulus, following AISC 360. Australian and British practice reverse the letters.
Neighbouring sizes
Where these numbers come from
Published AISC Shapes Database v15.0 values. How StructureCalcs verifies its numbers · Understanding steel section properties · Query this section over the API