Steel angle, often referred to as angle steel or angle bar, is a crucial structural material commonly used in construction, manufacturing, and engineering projects. It's important to understand the various sizes of steel angles to choose the right one for your needs, ensuring both strength and cost-effectiveness.

What Are Steel Angle Sizes?

Angle bar sizes refer to the dimensions of the angle bar, typically expressed as:

Leg Length × Leg Length × Thickness (for equal angles)

Leg Length 1 × Leg Length 2 × Thickness (for unequal angles)

For example:

50 × 50 × 5 mm (equal angle)

75 × 50 × 6 mm (unequal angle)

Other important size parameters include:

Length (commonly 6m, 9m, 12m)

Weight per meter

Standard tolerance

steel angle

Types of Angle Steel Sizes

1. Equal Steel Angle Sizes

Equal angles have two legs of the same length and are the most commonly used.

Common sizes:

20 × 20 × 3 mm

30 × 30 × 3 mm

50 × 50 × 5 mm

100 × 100 × 10 mm

200 × 200 × 20 mm

Applications:

Frames and brackets

Towers and structures

General construction

2. Unequal Angle Steel Sizes

Unequal angles have legs of different lengths, offering more flexibility in design.

Common sizes:

50 × 30 × 4 mm

75 × 50 × 6 mm

100 × 75 × 8 mm

150 × 90 × 10 mm

Applications:

Structural supports

Machinery frames

Reinforcement in complex designs

Steel Angle Sizes Chart (Typical Range)

Size (mm)

Thickness (mm)

Weight (kg/m)

25 × 25

3

1.12

40 × 40

4

2.42

50 × 50

5

3.77

75 × 75

6

6.80

100 × 100

8

12.20

150 × 150

12

27.30

Note: Values may vary slightly depending on standards and manufacturers.

Standard Steel Angle Sizes

Steel angle sizes are produced according to international standards, ensuring consistency and compatibility:

ASTM A36 / ASTM A6 (USA)

EN 10056 (Europe)

JIS G3192 (Japan)

GB/T 706 (China)

Typical standard length:

6 meters

9 meters

12 meters

Custom sizes and cut lengths are also available from manufacturers.

How to Choose the Right Angle Steel Size

When selecting the appropriate hot rolled angle steel size, consider:

1. Load Requirements – Heavier loads require thicker and larger angles

2. Application Type – Structural vs decorative use

3. Environment – Outdoor use may require galvanized angles

4. Cost Efficiency – Avoid over-specifying size

FAQ: Steel Angle Sizes

1. What is the standard size of steel angle?

There is no single standard size. Steel angles come in a wide range, typically from 20×20 mm to 200×200 mm, with thickness from 3 mm to 20 mm depending on standards.

2. How are steel angle sizes measured?

Steel angle sizes are measured by:

Leg length(s)

Thickness

For example, 50×50×5 mm means equal legs of 50 mm and thickness of 5 mm.

3. What is the difference between equal and unequal angle sizes?

Equal angle: Both legs are the same length

Unequal angle: Legs have different lengths

Unequal angles are used when different load distributions are required.

4. Are angle bar sizes the same worldwide?

No, sizes can vary slightly depending on standards such as ASTM, EN, JIS, or GB. However, many sizes are widely compatible across markets.

Conclusion

Understanding the sizes of steel angles, whether they are equal or unequal, along with their standard dimensions and thickness options, is essential for choosing the right material. By referring to a dependable steel angle sizes chart and taking your specific application needs into account, you can achieve the best performance and cost-effectiveness for your projects.