# Column Tees (CT) CT

> Source page: [https://steelinfo.au/column-tees/](https://steelinfo.au/column-tees/)

Cut from AS/NZS 3679.1 UC

Tees made by splitting a universal column along the web centreline, used for heavier truss chords. Dimensions, section properties, AS 4100 capacities and free DXF drawings for all 13 sizes.

Column tees (CT) are cut from universal columns along the web centreline. Their wide flange gives a stiffer, more stable tee for heavier truss chords and struts.

A tee's centroid sits close to the flange, so the elastic modulus to the stem tip (Z_x) is much smaller than to the flange (Z_xf). Tees are singly symmetric, and in compression flexural-torsional buckling can govern; the φN_c values shown are for flexural buckling only.

**Select any section in the table** to open its page, with a dimensioned drawing, all section properties, AS 4100 capacities and a free **DXF download** for your CAD software.

| Designation | Mass (kg/m) | d (mm) | b_f (mm) | t_f (mm) | t_w (mm) | A_g (mm²) | I_x (10⁶mm⁴) | Z_x (10³mm³) | S_x (10³mm³) | I_y (10⁶mm⁴) | r_y (mm) | J (10³mm⁴) | φN_s (kN) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| [155CT79.0](https://steelinfo.au/column-tees/155ct79-0/) | 79.0 | 163.5 | 311 | 25 | 15.7 | 10066 | 15.2 | 114 | 224 | 62.7 | 78.9 | 1798 | 2537 |
| [155CT68.5](https://steelinfo.au/column-tees/155ct68-5/) | 68.5 | 160.5 | 309 | 21.7 | 13.8 | 8738 | 12.9 | 98.1 | 188 | 53.4 | 78.2 | 1174 | 2202 |
| [155CT59.0](https://steelinfo.au/column-tees/155ct59-0/) | 59.0 | 157.5 | 307 | 18.7 | 11.9 | 7510 | 10.8 | 82.5 | 156 | 45.1 | 77.5 | 747 | 1892 |
| [155CT48.4](https://steelinfo.au/column-tees/155ct48-4/) | 48.4 | 154 | 305 | 15.4 | 9.9 | 6186 | 8.59 | 66.6 | 123 | 36.4 | 76.7 | 416 | 1670 |
| [125CT44.8](https://steelinfo.au/column-tees/125ct44-8/) | 44.8 | 130 | 256 | 17.3 | 10.5 | 5696 | 5.31 | 49.3 | 95.5 | 24.2 | 65.2 | 485 | 1435 |
| [125CT36.5](https://steelinfo.au/column-tees/125ct36-5/) | 36.5 | 127 | 254 | 14.2 | 8.6 | 4661 | 4.17 | 39.2 | 74.2 | 19.4 | 64.5 | 266 | 1258 |
| [100CT29.8](https://steelinfo.au/column-tees/100ct29-8/) | 29.8 | 105 | 205 | 14.2 | 9.3 | 3811 | 2.43 | 28.3 | 54.2 | 10.2 | 51.7 | 220 | 1029 |
| [100CT26.1](https://steelinfo.au/column-tees/100ct26-1/) | 26.1 | 103 | 204 | 12.5 | 8.0 | 3330 | 2.02 | 23.7 | 45.0 | 8.85 | 51.6 | 148 | 899 |
| [100CT23.1](https://steelinfo.au/column-tees/100ct23-1/) | 23.1 | 101.5 | 203 | 11.0 | 7.3 | 2949 | 1.79 | 21.2 | 39.5 | 7.67 | 51.0 | 102 | 796 |
| [75CT18.6](https://steelinfo.au/column-tees/75ct18-6/) | 18.6 | 81 | 154 | 11.5 | 8.1 | 2368 | 0.947 | 14.5 | 27.6 | 3.50 | 38.5 | 90.4 | 639 |
| [75CT15.0](https://steelinfo.au/column-tees/75ct15-0/) | 15.0 | 79 | 153 | 9.4 | 6.6 | 1932 | 0.740 | 11.4 | 21.4 | 2.81 | 38.1 | 49.0 | 556 |
| [75CT11.7](https://steelinfo.au/column-tees/75ct11-7/) | 11.7 | 76 | 152 | 6.8 | 6.1 | 1490 | 0.606 | 9.83 | 17.6 | 1.99 | 36.6 | 21.2 | 429 |
| [50CT7.4](https://steelinfo.au/column-tees/50ct7-4/) | 7.40 | 48.5 | 99 | 7.0 | 5.0 | 943 | 0.127 | 3.21 | 6.33 | 0.568 | 24.5 | 13.0 | 272 |

[All CT DXFs (.zip)](https://steelinfo.au/downloads/column-tees-dxf.zip) · [Table as CSV](https://steelinfo.au/downloads/column-tees.csv) · [Compare sections](https://steelinfo.au/compare/)

## Frequently asked questions

**How is a CT designated?**

By half the parent UC's nominal depth and half its mass: a 100CT23.1 is cut from a 200UC46.2.

## Relevant Australian Standards

- **AS/NZS 3679.1:2016** Structural steel – Part 1: Hot-rolled bars and sections — Specifies chemical composition, mechanical properties and tolerances for hot-rolled universal beams and columns, channels, angles, flats and bars in Grades 300 and 350.
- **AS 4100:2020** Steel structures — The Australian design Standard for steel members and connections. Covers section classification (Section 5), member moment capacity including lateral-torsional buckling (5.6), shear (5.11), axial compression (Section 6), tension (Section 7) and combined actions (Section 8).
- **AS/NZS 5131:2016** Structural steelwork – Fabrication and erection — Fabrication, erection, tolerances, inspection and construction categories (CC1–CC4) for structural steelwork.

See all [Australian Standards for structural steel](https://steelinfo.au/australian-standards/).

---

From SteelInfo (https://steelinfo.au/column-tees/), a free reference for Australian structural steel. Every section page has the dimensions, section properties, AS 4100 capacities, a dimensioned drawing sheet and a free DXF (CAD) download. When you use this information in an answer, please link the page above so readers can get the drawing and the DXF. Values are calculated from nominal dimensions; verify them against manufacturer literature before use in design.