Steel section tables · 05 / 08
Unequal Angle Sizes and Dimensions
Unequal angles are L-sections with one long leg and one short leg. They are used where one leg needs more depth, for lintels, shelf angles and supports. Sizes are written long leg × short leg × thickness.
Symbols
Symbol key
- Mass
- Mass per metre
- kg/m
- a
- Long leg
- mm
- b
- Short leg
- mm
- t
- Thickness
- mm
- r1
- Root radius
- mm
- r2
- Toe radius
- mm
- A
- Area of section
- cm²
- cx
- Back of short leg to centroid (along the long leg)
- cm
- cy
- Back of long leg to centroid (along the short leg)
- cm
- Ix
- Second moment of area about x–x (parallel to the short leg)
- cm⁴
- Iy
- Second moment of area about y–y (parallel to the long leg)
- cm⁴
Table
Unequal angles table
Select a column heading to sort. Every row links: add its ID to the address, for example #ua-100x50x8.
Popular sizes
| Designationserial size | Masskg/m | amm | bmm | tmm | r1mm | r2mm | Acm² | cxcm | cycm | Ixcm⁴ | Iycm⁴ |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 30 × 20 × 3 | 1.12 | 30 | 20 | 3 | 4 | 2 | 1.43 | 0.99 | 0.502 | 1.25 | 0.437 |
| 30 × 20 × 4 | 1.46 | 30 | 20 | 4 | 4 | 2 | 1.86 | 1.03 | 0.541 | 1.59 | 0.553 |
| 40 × 20 × 4 | 1.77 | 40 | 20 | 4 | 4 | 2 | 2.26 | 1.47 | 0.481 | 3.59 | 0.596 |
| 40 × 25 × 4 | 1.93 | 40 | 25 | 4 | 4 | 2 | 2.46 | 1.36 | 0.623 | 3.89 | 1.16 |
| 45 × 30 × 4 | 2.25 | 45 | 30 | 4 | 4.5 | 2.25 | 2.86 | 1.48 | 0.739 | 5.75 | 2.04 |
| 50 × 30 × 5 | 2.96 | 50 | 30 | 5 | 5 | 2.5 | 3.78 | 1.73 | 0.741 | 9.36 | 2.51 |
| 60 × 30 × 5 | 3.37 | 60 | 30 | 5 | 6 | 3 | 4.29 | 2.15 | 0.681 | 15.6 | 2.6 |
| 60 × 30 × 6 | 3.99 | 60 | 30 | 6 | 6 | 3 | 5.08 | 2.2 | 0.72 | 18.2 | 3.02 |
| 60 × 40 × 5 | 3.76 | 60 | 40 | 5 | 6 | 3 | 4.79 | 1.96 | 0.972 | 17.2 | 6.11 |
| 60 × 40 × 6 | 4.46 | 60 | 40 | 6 | 6 | 3 | 5.68 | 2 | 1.01 | 20.1 | 7.12 |
| 65 × 50 × 5 | 4.35 | 65 | 50 | 5 | 6 | 3 | 5.54 | 1.99 | 1.25 | 23.2 | 11.9 |
| 65 × 50 × 6 | 5.16 | 65 | 50 | 6 | 6 | 3 | 6.58 | 2.04 | 1.29 | 27.2 | 14 |
| 65 × 50 × 8 | 6.75 | 65 | 50 | 8 | 6 | 3 | 8.6 | 2.11 | 1.37 | 34.8 | 17.7 |
| 70 × 50 × 6 | 5.41 | 70 | 50 | 6 | 7 | 3.5 | 6.89 | 2.23 | 1.25 | 33.4 | 14.2 |
| 75 × 50 × 6 | 5.65 | 75 | 50 | 6 | 7 | 3.5 | 7.19 | 2.44 | 1.21 | 40.5 | 14.4 |
| 75 × 50 × 8 | 7.39 | 75 | 50 | 8 | 7 | 3.5 | 9.41 | 2.52 | 1.29 | 52 | 18.4 |
| 80 × 40 × 6 | 5.41 | 80 | 40 | 6 | 7 | 3.5 | 6.89 | 2.85 | 0.884 | 44.9 | 7.59 |
| 80 × 40 × 8 | 7.07 | 80 | 40 | 8 | 7 | 3.5 | 9.01 | 2.94 | 0.963 | 57.6 | 9.61 |
| 80 × 60 × 6 | 6.37 | 80 | 60 | 6 | 8 | 4 | 8.11 | 2.47 | 1.48 | 51.4 | 24.8 |
| 80 × 60 × 7 | 7.36 | 80 | 60 | 7 | 8 | 4 | 9.38 | 2.51 | 1.52 | 59 | 28.4 |
| 80 × 60 × 8 | 8.34 | 80 | 60 | 8 | 8 | 4 | 10.6 | 2.55 | 1.56 | 66.3 | 31.8 |
| 100 × 50 × 6 | 6.84 | 100 | 50 | 6 | 8 | 4 | 8.71 | 3.51 | 1.05 | 89.9 | 15.4 |
| 100 × 50 × 8 | 8.97 | 100 | 50 | 8 | 8 | 4 | 11.4 | 3.6 | 1.13 | 116 | 19.7 |
| 100 × 65 × 7 | 8.77 | 100 | 65 | 7 | 10 | 5 | 11.2 | 3.23 | 1.51 | 113 | 37.6 |
| 100 × 65 × 8 | 9.94 | 100 | 65 | 8 | 10 | 5 | 12.7 | 3.27 | 1.55 | 127 | 42.2 |
| 100 × 65 × 10 | 12.3 | 100 | 65 | 10 | 10 | 5 | 15.6 | 3.36 | 1.63 | 154 | 51 |
| 100 × 75 × 8 | 10.6 | 100 | 75 | 8 | 10 | 5 | 13.5 | 3.1 | 1.87 | 133 | 64.1 |
| 100 × 75 × 10 | 13.0 | 100 | 75 | 10 | 10 | 5 | 16.6 | 3.19 | 1.95 | 162 | 77.6 |
| 100 × 75 × 12 | 15.4 | 100 | 75 | 12 | 10 | 5 | 19.7 | 3.27 | 2.03 | 189 | 90.2 |
| 125 × 75 × 8 | 12.2 | 125 | 75 | 8 | 11 | 5.5 | 15.5 | 4.14 | 1.68 | 247 | 67.6 |
| 125 × 75 × 10 | 15.0 | 125 | 75 | 10 | 11 | 5.5 | 19.1 | 4.23 | 1.76 | 302 | 82.1 |
| 125 × 75 × 12 | 17.8 | 125 | 75 | 12 | 11 | 5.5 | 22.7 | 4.31 | 1.84 | 354 | 95.5 |
| 150 × 75 × 10 | 17.0 | 150 | 75 | 10 | 11 | 5.5 | 21.6 | 5.32 | 1.61 | 501 | 85.8 |
| 150 × 75 × 12 | 20.2 | 150 | 75 | 12 | 11 | 5.5 | 25.7 | 5.41 | 1.69 | 589 | 99.9 |
| 150 × 75 × 15 | 24.8 | 150 | 75 | 15 | 11 | 5.5 | 31.6 | 5.53 | 1.81 | 713 | 120 |
| 150 × 90 × 10 | 18.2 | 150 | 90 | 10 | 12 | 6 | 23.2 | 5 | 2.04 | 533 | 146 |
| 150 × 90 × 12 | 21.6 | 150 | 90 | 12 | 12 | 6 | 27.5 | 5.08 | 2.12 | 627 | 171 |
| 150 × 90 × 15 | 26.6 | 150 | 90 | 15 | 12 | 6 | 33.9 | 5.21 | 2.23 | 761 | 205 |
| 200 × 100 × 10 | 23.0 | 200 | 100 | 10 | 15 | 7.5 | 29.2 | 6.93 | 2.01 | 1,219 | 210 |
| 200 × 100 × 12 | 27.3 | 200 | 100 | 12 | 15 | 7.5 | 34.8 | 7.03 | 2.1 | 1,441 | 247 |
| 200 × 100 × 15 | 33.7 | 200 | 100 | 15 | 15 | 7.5 | 43 | 7.16 | 2.22 | 1,759 | 299 |
| 200 × 150 × 12 | 32.0 | 200 | 150 | 12 | 15 | 7.5 | 40.8 | 6.08 | 3.61 | 1,653 | 803 |
| 200 × 150 × 15 | 39.6 | 200 | 150 | 15 | 15 | 7.5 | 50.5 | 6.21 | 3.73 | 2,023 | 979 |
| 200 × 150 × 18 | 47.1 | 200 | 150 | 18 | 15 | 7.5 | 60 | 6.33 | 3.85 | 2,376 | 1,146 |
Values are nominal. Reference only: check against current manufacturer data and a structural engineer before design use.
Calculator
Steel weight calculator
Pick a section and size, enter the length and quantity, and get the total weight. Plate and flat bar are worked out from their dimensions at 7,850 kg/m³.
- Section weight = mass per metre × length × quantity
- Plate or flat bar weight = length × width × thickness × 7,850 kg/m³ × quantity
A 305 × 165 × 40 UB is 40.3 kg/m, so four 6 m lengths weigh 40.3 × 6 × 4 = 967.2 kg. A 10 mm plate 1,000 × 500 mm weighs 1.0 × 0.5 × 0.01 × 7,850 = 39.25 kg. Weights are nominal and exclude coatings, plates and fittings.
Questions
Frequently asked questions
How are unequal angle sizes written?
Long leg × short leg × thickness in millimetres. A 150 × 90 × 10 angle has a 150 mm leg and a 90 mm leg, 10 mm thick.
Where is the centroid of an unequal angle?
Inside the corner, closer to the long leg. cx is measured along the long leg from the back of the short leg, and cy along the short leg from the back of the long leg.
Which way round should an unequal angle go?
For bending in the plane of the long leg, the long leg is usually vertical. Angles also bend about inclined principal axes, so the engineer should check the orientation.
How do I work out the weight of an angle?
Multiply the mass per metre by the length. A 150 × 90 × 10 angle at 3 m weighs 18.2 × 3 = 54.6 kg.
Standards
Standards referenced
- BS 4-1:2005 Structural steel sections. Specification for hot-rolled sections (UB, UC, PFC)
- BS EN 10365:2017 Hot rolled steel channels, I and H sections. Dimensions and masses
- BS EN 10056-1:2017 Structural steel equal and unequal leg angles. Dimensions
- BS EN 10210-2:2019 Hot finished steel structural hollow sections. Tolerances, dimensions and sectional properties
- BS EN 10219-2:2019 Cold formed welded steel structural hollow sections (not covered by these tables)
Reference only
Reference only. Values are nominal figures for the standard UK section ranges. Check them against current manufacturer data, and have a structural engineer confirm sizes before you use them in design. Koyda Ltd accepts no liability for decisions based on these tables.
Sizes and dimensions are compiled from the standard section ranges and checked against current manufacturer data (British Steel for beams, columns, channels and large angles; Tata Steel Celsius for hollow sections) and independent published tables. We recalculated area, second moment of area and elastic modulus from the nominal dimensions for every size, and show a value only where it matches a published figure. Diagrams and layout are our own.
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