# Unequal Angles UA

> Source page: [https://steelinfo.au/unequal-angles/](https://steelinfo.au/unequal-angles/)

AS/NZS 3679.1

Hot-rolled angles with unequal legs, used for lintels, bracing, shelf angles and connections. Dimensions, section properties, AS 4100 capacities and free DXF drawings for all 19 sizes.

Unequal angles (UA) have one leg longer than the other, giving a stiffer section about one axis. They are commonly used for lintels (long leg vertical), shelf angles, purlin cleats and bracing. Properties are given about the geometric and principal axes; the principal axes are inclined at angle α to the leg directions.

**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 (mm) | t (mm) | A_g (mm²) | I_x (10⁶mm⁴) | Z_x (10³mm³) | S_x (10³mm³) | I_y (10⁶mm⁴) | r_v (mm) | J (10³mm⁴) | φN_s (kN) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| [150x100x12UA](https://steelinfo.au/unequal-angles/150x100x12ua/) | 22.5 | 150 | 100 | 12.0 | 2867 | 6.52 | 64.6 | 117 | 2.34 | 21.7 | 137 | 774 |
| [150x100x10UA](https://steelinfo.au/unequal-angles/150x100x10ua/) | 18.0 | 150 | 100 | 9.5 | 2295 | 5.29 | 51.9 | 94.0 | 1.91 | 21.8 | 68.7 | 618 |
| [150x90x16UA](https://steelinfo.au/unequal-angles/150x90x16ua/) | 27.9 | 150 | 90 | 15.8 | 3553 | 7.97 | 81.7 | 145 | 2.15 | 19.3 | 295 | 959 |
| [150x90x12UA](https://steelinfo.au/unequal-angles/150x90x12ua/) | 21.6 | 150 | 90 | 12.0 | 2747 | 6.29 | 63.5 | 114 | 1.72 | 19.5 | 131 | 742 |
| [150x90x10UA](https://steelinfo.au/unequal-angles/150x90x10ua/) | 17.3 | 150 | 90 | 9.5 | 2200 | 5.10 | 51.0 | 91.5 | 1.41 | 19.6 | 65.9 | 591 |
| [150x90x8UA](https://steelinfo.au/unequal-angles/150x90x8ua/) | 14.3 | 150 | 90 | 7.8 | 1822 | 4.26 | 42.3 | 76.0 | 1.18 | 19.7 | 36.7 | 436 |
| [125x75x12UA](https://steelinfo.au/unequal-angles/125x75x12ua/) | 17.7 | 125 | 75 | 12.0 | 2259 | 3.54 | 43.3 | 77.3 | 0.958 | 16.1 | 108 | 610 |
| [125x75x10UA](https://steelinfo.au/unequal-angles/125x75x10ua/) | 14.2 | 125 | 75 | 9.5 | 1813 | 2.88 | 34.9 | 62.5 | 0.789 | 16.2 | 54.4 | 522 |
| [125x75x8UA](https://steelinfo.au/unequal-angles/125x75x8ua/) | 11.8 | 125 | 75 | 7.8 | 1502 | 2.41 | 28.9 | 52.0 | 0.664 | 16.3 | 30.4 | 400 |
| [125x75x6UA](https://steelinfo.au/unequal-angles/125x75x6ua/) | 9.16 | 125 | 75 | 6.0 | 1167 | 1.89 | 22.5 | 40.6 | 0.524 | 16.4 | 14.0 | 267 |
| [100x75x10UA](https://steelinfo.au/unequal-angles/100x75x10ua/) | 12.4 | 100 | 75 | 9.5 | 1575 | 1.55 | 22.6 | 41.3 | 0.743 | 16.0 | 47.3 | 454 |
| [100x75x8UA](https://steelinfo.au/unequal-angles/100x75x8ua/) | 10.3 | 100 | 75 | 7.8 | 1307 | 1.30 | 18.8 | 34.5 | 0.626 | 16.0 | 26.4 | 376 |
| [100x75x6UA](https://steelinfo.au/unequal-angles/100x75x6ua/) | 7.98 | 100 | 75 | 6.0 | 1017 | 1.02 | 14.6 | 26.9 | 0.494 | 16.2 | 12.2 | 267 |
| [75x50x8UA](https://steelinfo.au/unequal-angles/75x50x8ua/) | 7.23 | 75 | 50 | 7.8 | 921 | 0.511 | 10.3 | 18.5 | 0.181 | 10.7 | 18.5 | 265 |
| [75x50x6UA](https://steelinfo.au/unequal-angles/75x50x6ua/) | 5.66 | 75 | 50 | 6.0 | 721 | 0.407 | 8.05 | 14.6 | 0.145 | 10.8 | 8.57 | 208 |
| [75x50x5UA](https://steelinfo.au/unequal-angles/75x50x5ua/) | 4.40 | 75 | 50 | 4.6 | 560 | 0.321 | 6.27 | 11.4 | 0.115 | 10.9 | 3.91 | 148 |
| [65x50x8UA](https://steelinfo.au/unequal-angles/65x50x8ua/) | 6.59 | 65 | 50 | 7.8 | 840 | 0.341 | 7.75 | 14.1 | 0.174 | 10.6 | 17.0 | 242 |
| [65x50x6UA](https://steelinfo.au/unequal-angles/65x50x6ua/) | 5.16 | 65 | 50 | 6.0 | 658 | 0.272 | 6.10 | 11.1 | 0.140 | 10.6 | 7.85 | 189 |
| [65x50x5UA](https://steelinfo.au/unequal-angles/65x50x5ua/) | 4.02 | 65 | 50 | 4.6 | 512 | 0.215 | 4.75 | 8.71 | 0.111 | 10.7 | 3.58 | 147 |

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

## Frequently asked questions

**Long leg vertical or short leg vertical?**

For lintels and shelf angles, put the long leg vertical: it gives a much larger second moment of area about the horizontal axis. Check the principal-axis behaviour of single angles, which bend about inclined axes unless restrained.

## 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 1252.1:2016** High-strength steel fastener assemblies for structural engineering — Property class 8.8 structural bolts, nuts and washers used in bolted connections designed to AS 4100.
- **AS/NZS 2312.1:2014 & 2312.2:2014** Guide to the protection of structural steel against atmospheric corrosion — Part 1 covers protective paint coatings and Part 2 hot-dip galvanizing; both use the external surface areas given on each section page.

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

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From SteelInfo (https://steelinfo.au/unequal-angles/), 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.