Equal & Unequal Steel Angle Sizes Chart in MM and Inches | Steel Angle Dimensions & Properties

Steel angle is one of the major shapes of structural steel, similar to beam and channel. Today, we’ll break down the steel angle types (equal & unequal), properties, grades, measurement, and cutting methods, as well as the metric/imperial steel angle (angle iron) size chart in mm and inches (PDF provided).

What Is a Steel Angle?

Steel angle, also known as angle iron or steel angle bar, is a type of structural steel that is commonly used in construction and manufacturing. Steel angles have an L-shaped cross-section, which consists of two legs that meet at a 90-degree angle. Steel angles can be classified into two main types by the leg length: equal angles and unequal angles. They are typically made from hot-rolled carbon steel or high-strength low-alloy steel by bending a piece of metal. The main purpose of a steel or metal angle is to provide better support in corners.

What Is Mild Steel Angle?
A mild steel angle, commonly referred to as MS angle, is an L-shaped piece of metal made from mild steel. These angles are known for their high strength, corrosion resistance, and cost-effectiveness. Mild steel angles are widely used in the construction, machinery and equipment, automobile, furniture, and decor industries.

Properties of Steel Angle

Take one of the most common carbon steel – A36 steel angle as an example, steel angles have specific properties. 

• Weight per Foot: The weight of steel angles varies based on their dimensions. For example, an L8x8x11/8 angle weighs approximately 56.9 lbs per foot, while an L8x8x1 angle weighs about 51 lbs per foot.
• Cross-Section Area: The cross-sectional area determines the load-bearing capacity. For instance, an L8x8x1 angle has a cross-sectional area of 15 in².
• Area Moment of Inertia: This property indicates how resistant the angle is to bending. For example, the moment of inertia for an L8x8x1 angle is 89 in⁴.
• Yield Strength: A36 steel angles typically have a yield strength of around 36,000 psi.
• Tensile Strength: The tensile strength of A36 carbon steel angles can range from 58,000 to 80,000 psi. Compared to square tubes, angle iron has a higher strength. Steel angle is one of the strongest structural support elements.

Material Grades of Steel Angles

Steel angles can be fabricated from various steel alloys.
Mild Steel Angles

• A36: This is one of the most common grades used for structural steel angles. It has good weldability and is suitable for a variety of construction applications. Galvanized steel angles are a typical type of A36 hot-rolled, mild steel angles that are coated with a protective layer of zinc.
• S235JR: A European standard grade that offers good tensile strength and is often used in construction and engineering.
• Q235: A Chinese standard grade similar to A36, widely used in construction and manufacturing.
• SS400: A Japanese standard grade is known for its good weldability and versatility in structural applications.
• SS490: Another Japanese grade that offers higher strength compared to SS400, suitable for more demanding applications.
• ST37: A low-carbon steel grade that is often used in structural applications due to its good weldability and machinability.

High Strength Low Alloy (HSLA) Steel Angles

• A572: This grade is stronger than A36 and is often used in applications requiring higher strength-to-weight ratios.
• A588: Known for its weathering properties, this grade is ideal for structures exposed to harsh environments, as it develops a protective rust layer.

How to Measure Steel Angles?

The measurement of steel angles involves three dimensions: the length of each leg and the leg thickness. The rounded inside angle is called a fillet; the fillet radius size is not always provided, but needs to be considered if the angle will be used to cover a 90-degree angle. If the fillet radius is required to be 90 degrees, the standard structural angle will not work in this application.
Key Measurements

• Leg Length: Measure the length of each leg of the angle. For equal angles, both legs will be the same length, while for unequal angles, the legs will differ.
• Thickness: Measure the thickness of the legs. This is crucial for understanding the strength and load-bearing capacity of the angle.

Measurement Process

• Tools Needed: Use a tape measure or caliper for precise measurements.
• Positioning: Ensure the angle is placed on a flat surface for accurate measurement.
• Recording Dimensions: Write down the measurements in the format of “Leg Length x Leg Length x Thickness” (e.g., 2” x 2” x 1/8” for an equal angle) or “Leg Length x Leg Length x Thickness” for unequal angles (e.g., 3” x 2” x 3/16”).

Best Tools and Ways to Cut Steel Angle

Cutting steel angles can be done effectively using various tools, depending on the precision required and the volume of cuts needed.
1. Chop Saw
A chop saw is one of the best tools for making multiple precise cuts. By using a diamond or abrasive blade, you can achieve clean and accurate cuts quickly. This is recommended for projects requiring several pieces of angle iron.

2. Angle Grinder
For smaller jobs, an angle grinder equipped with a cutoff wheel is a reliable option. It can handle various angles and shapes, and is suitable for trimming and notching.

3. Torch Cutting
If you need to make more complex cuts or shapes, a cutting torch can be very effective. Torch cutting is particularly useful for creating bolt holes or intricate designs in thicker steel angles.

4. Miter Saw
A miter saw can also be used for cutting steel angles, especially when making angled cuts. However, it requires careful handling and marking to ensure accuracy.

5. Hand Tools
For lighter gauge steel angles, hand tools like a hacksaw or aviation snips can be used, although they may require more effort and time compared to power tools.

Steel Angle Size Chart – Angle Iron Dimensions

Steel angles are usually described by their leg lengths and thickness:

• Leg lengths: These are the two sides of the “L.” For example, a steel angle might be 8 inches by 8 inches, meaning each leg is 8 inches long. Sometimes, steel angles have unequal leg lengths, like 30 x 20 x 3, where one leg is 30 mm and the other is 20 mm.
• Thickness: This tells you how thick the steel is. For example, a thickness of L8 x 8 x 1 1/8 steel angle is 1.125-inch thick.

Weight of Steel Angles
The weight of a steel angle depends on its dimensions and the density of steel. Steel is about 7.85 grams per cubic centimeter or 7850 kg per cubic meter.

Sectional Area of Steel Angles
The sectional area is the total area of the steel cross-section (the cut surface if you slice across the angle). It’s important because it helps engineers understand how strong or sturdy the angle is. To calculate the sectional area, you add the areas of the two legs (length × thickness) and subtract the overlapping corner thickness (because the legs meet at a right angle, the corner thickness is counted twice). Here’s a simple formula for equal-leg angles:
Sectional Area = (Leg length × Thickness × 2) – (Thickness × Thickness)

Imperial Steel Angle Size Chart in Inches

Size (Depth x Width x Thickness)	Weight	Sectional Area
	lb/ft	in2
L8 x 8 x 1 1/8	56.9	16.7
L8 x 8 x 1	51.0	15.0
L8 x 8 x 7/8	45.0	13.2
L8 x 8 x 3/4	38.9	11.4
L8 x 8 x 5/8	32.7	9.61
L8 x 8 x 9/16	29.6	8.68
L8 x 8 x 1/2	26.4	7.75
L8 x 6 x 1	44.2	13.0
L8 x 6 x 7/8	39.1	11.5
L8 x 6 x 3/4	33.8	9.94
L8 x 6 x 5/8	28.5	8.36
L8 x 6 x 9/16	25.7	7.56
L8 x 6 x 1/2	23.0	6.75
L8 x 6 x 7/16	20.2	5.93
L8 x 4 x 1	37.4	11.0
L8 x 4 x 7/8	33.1	9.73
L8 x 4 x 3/4	28.7	8.44
L8 x 4 x 5/8	24.2	7.11
L8 x 4 x 9/16	21.9	6.43
L8 x 4 x 1/2	19.6	5.75
L8 x 4 x 7/16	17.2	5.06
L7 x 4 x 3/4	26.2	7.69
L7 x 4 x 5/8	22.1	6.48
L7 x 4 x 1/2	17.9	5.25
L7 x 4 x 7/16	15.7	4.62
L7 x 4 x 3/8	13.6	3.98
L6 x 6 x 1	37.4	11.0
L6 x 6 x 7/8	33.1	9.75
L6 x 6 x 3/4	28.7	8.46
L6 x 6 x 5/8	24.2	7.13
L6 x 6 x 9/16	21.9	6.45
L6 x 6 x 1/2	19.6	5.77
L6 x 6 x 7/16	17.2	5.08
L6 x 6 x 3/8	14.9	4.38
L6 x 6 x 5/16	12.4	3.67
L6 x 4 x 7/8	27.2	7.98
L6 x 4 x 3/4	23.6	6.94
L6 x 4 x 5/8	20.0	5.86
L6 x 4 x 9/16	18.1	5.31
L6 x 4 x 1/2	16.2	4.75
L6 x 4 x 7/16	14.3	4.18
L6 x 4 x 3/8	12.3	3.61
L6 x 4 x 5/16	10.3	3.03
L6 x 3 1/2 x 1/2	15.3	4.50
L6 x 3 1/2 x 3/8	11.7	3.42
L6 x 3 1/2 x 5/16	9.80	2.87
L5 x 5 x 7/8	27.2	7.98
L5 x 5 x 3/4	23.6	6.94
L5 x 5 x 5/8	20.0	5.86
L5 x 5 x 1/2	16.2	4.75
L5 x 5 x 7/16	14.3	4.18
L5 x 5 x 3/8	12.3	3.61
L5 x 5 x 5/16	10.3	3.03
L5 x 3 1/2 x 3/4	19.8	5.81
L5 x 3 1/2 x 5/8	16.8	4.92
L5 x 3 1/2 x 1/2	13.6	4.00
L5 x 3 1/2 x 3/8	10.4	3.05
L5 x 3 1/2 x 5/16	8.70	2.56
L5 x 3 1/2 x1/4	7.00	2.06
L5 x 3 x 1/2	12.8	3.75
L5 x 3 x 7/16	11.3	3.31
L5 x 3 x 3/8	9.80	2.86
L5 x 3 x 5/16	8.20	2.40
L5 x 3 x 1/4	6.60	1.94
L4 x 4 x 3/4	18.5	5.44
L4 x 4 x 5/8	15.7	4.61
L4 x 4 x 1/2	12.8	3.75
L4 x 4 x 7/16	11.3	3.31
L4 x 4 x 3/8	9.80	2.86
L4 x 4 x 5/16	8.20	2.40
L4 x 4 x 1/4	6.60	1.94
L4 x 3 1/2 x 1/2	11.9	3.50
L4 x 3 1/2 x 3/8	9.10	2.67
L4 x 3 1/2 x 5/16	7.70	2.25
L4 x 3 1/2 x 1/4	6.20	1.81
L4 x 3 x 5/8	13.6	3.89
L4 x 3 x 1/2	11.1	3.25
L4 x 3 x 3/8	8.50	2.48
L4 x 3 x 5/16	7.20	2.09
L4 x 3 x 1/4	5.80	1.69
L3 1/2 x 3 1/2 x 1/2	11.1	3.25
L3 1/2 x 3 1/2 x 7/16	9.80	2.87
L3 1/2 x 3 1/2 x 3/8	8.50	2.48
L3 1/2 x 3 1/2 x 5/16	7.20	2.09
L3 1/2 x 3 1/2 x 1/4	5.80	1.69
L3 1/2 x 3 x 1/2	10.2	3.00
L3 1/2 x 3 x 7/16	9.10	2.65
L3 1/2 x 3 x 3/8	7.90	2.30
L3 1/2 x 3 x 5/16	6.60	1.93
L3 1/2 x 3 x 1/4	5.40	1.56
L3 1/2 x 2 1/2 x 1/2	9.40	2.75
L3 1/2 x 2 1/2 x 3/8	7.20	2.11
L3 1/2 x 2 1/2 x 5/16	6.10	1.78
L3 1/2 x 2 1/2 x 1/4	4.90	1.44
L3 x 3 x 1/2	9.40	2.75
L3 x 3 x 7/16	8.30	2.43
L3 x 3 x 3/8	7.20	2.11
L3 x 3 x 5/16	6.10	1.78
L3 x 3 x 1/4	4.90	1.44
L3 x 3 x 3/16	3.71	1.09
L3 x 2 1/2 x 1/2	8.50	2.50
L3 x 2 1/2 x 7/16	7.60	2.21
L3 x 2 1/2 x 3/8	6.60	1.92
L3 x 2 1/2 x 5/16	5.60	1.67
L3 x 2 1/2 x 1/4	4.50	1.31
L3 x 2 1/2 x 3/16	3.39	0.996
L3 x 2 x 1/2	7.70	2.25
L3 x 2 x 3/8	5.90	1.73
L3 x 2 x 5/16	5.00	1.46
L3 x 2 x 1/4	4.10	1.19
L3 x 2 x 3/16	3.07	0.902
L2 1/2 x 2 1/2 x 1/2	7.70	2.25
L2 1/2 x 2 1/2 x 3/8	5.90	1.73
L2 1/2 x 2 1/2 x 5/16	5.00	1.46
L2 1/2 x 2 1/2 x 1/4	4.10	1.19
L2 1/2 x 2 1/2 x 3/16	3.07	0.900
L2 1/2 x 2 x 3/8	5.30	1.55
L2 1/2 x 2 x 5/16	4.50	1.31
L2 1/2 x 2 x 1/4	3.62	1.06
L2 1/2 x 2 x 3/16	2.75	0.809
L2 1/2 x 1 1/2 x 1/4	3.22	0.938
L2 1/2 x 1 1/2 x 3/16	2.47	0.715
L2 x 2 x 3/8	4.70	1.36
L2 x 2 x 5/16	3.92	1.15
L2 x 2 x 1/4	3.19	0.938
L2 x 2 x 3/16	2.44	0.715
L2 x 2 x 1/8	1.65	0.484

Metric Steel Angle Size Chart in MM (Equal Leg)

Designation	Mass	Section Area	Dimensions
			a	t	rroot
	kg/m	cm2	mm	mm	mm
20 x 20 x 3	0.882	1.12	20	3	3.5
25 x 25 x 3	1.12	1.42	25	3	3.5
25 x 25 x 4	1.45	1.85	25	4	3.5
30 x 30 x 3	1.36	1.74	30	3	5
30 x 30 x 4	1.78	2.27	30	4	5
35 x 35x 4	2.09	2.67	35	4	5
40 x 40 x 4	2.42	3.08	40	4	6
40 x 40 x 5	2.97	3.79	40	5	6
45 x 45 x 4.5	3.06	3.90	45	4.5	7
50 x 50 x 4	3.06	3.89	50	4	7
50 x 50 x 5	3.77	4.80	50	5	7
50 x 50 x 6	4.47	5.69	50	6	7
60 x 60 x 5	4.57	5.82	60	5	8
60 x 60 x 6	5.42	6.91	60	6	8
60 x 60 x 8	7.09	9.03	60	8	8
65 x 65 x 7	6.83	8.7	65	7	9
70 x 70 x 6	6.38	8.13	70	6	9
70 x 70 x 7	7.38	9..40	70	7	9
75 x 75 x 6	6.85	8.73	75	6	9
75 x 75 x 8	8.99	11.4	75	8	9
80 x 80 x 8	9.63	12.3	80	8	10
80 x 80 x 10	11.9	15.1	80	10	10
90 x 90 x 7	9.61	12.2	90	7	11
90 x 90 x 8	10.9	13.9	90	8	11
90 x 90 x 9	12.2	15.5	90	9	11
90 x 90 x 10	13.4	17.1	90	10	11
100 x 100 x 8	12.2	15.5	100	8	12
100 x 100 x 10	15.0	19.2	100	10	12
100 x 100 x 12	17.8	22.7	100	12	12
120 x 120 x 10	18.2	23.2	120	10	13
120 x 120 x 12	21.6	27.5	120	12	13
130 x 130 x 12	23.6	30.0	130	12	14
150 x 150 x 10	23.0	29.3	150	10	16
150 x 150 x 12	27.3	34.8	150	12	16
150 x 150 x 15	33.8	43.0	150	15	16
160 x 160 x 15	36.2	46.1	160	15	17
180 x 180 x 16	43.5	55.4	180	16	18
180 x 180 x 18	48.6	61.9	180	18	18
200 x 200 x 16	48.5	61.8	200	16	18
200 x 200 x 18	54.3	69.1	200	18	18
200 x 200 x 20	59.9	76.3	200	20	18
200 x 200 x 24	71.1	90.6	200	24	18
250 x 250 x 28	104	133	250	28	18
250 x 250 x 35	128	163	250	35	18

Metric Steel Angle Size Chart in MM (Unequal Leg)

Designation	Mass	Section Area	Dimensions
			a	b	t	rroot
	kg/m	cm2	mm	mm	mm	mm
30 x 20 x 3	1.12	1.43	30	20	3	4
30 x 20 x 4	1.46	1.86	30	20	4	4
40 x 20 x 4	1.77	2.26	40	20	4	4
40 x 25 x 4	1.93	2.46	40	25	4	4
45 x 30 x 4	2.25	2.87	45	30	4	4.5
50 x 30 x 5	2.96	3.78	50	30	5	5
60 x 30 x 5	3.36	4.28	60	30	5	5
60 x 40 x 5	3.76	4.79	60	40	5	6
60 x 40 x 6	4.46	5.68	60	40	6	6
65 x 50 x 5	4.35	5.54	65	50	5	6
70 x 50 x 6	5.41	6.89	70	50	6	7
75 x 50 x 6	5.65	7.19	75	50	6	7
75 x 50 x 8	7.39	9.41	75	50	8	7
80 x 40 x 6	5.41	6.89	80	40	6	7
80 x 40 x 8	7.07	9.01	80	40	8	7
80 x 60 x 7	7.36	9.38	80	60	7	8
100 x 50 x 6	6.84	8.71	100	50	6	8
100 x 50 x 8	8.97	11.4	100	50	8	8
100 x 65 x 7	8.77	11.2	100	65	7	10
100 x 65 x 8	9.94	12.7	100	65	8	10
100 x 65 x 10	12.3	15.6	100	65	10	10
100 x 75 x 8	10.6	13.5	100	75	8	10
100 x 75 x 10	13.0	16.6	100	75	10	10
100 x 75 x 12	15.4	19.7	100	75	12	10
120 x 80 x 8	12.2	15.5	120	80	8	11
120 x 80 x 10	15.0	19.1	120	80	10	11
120 x 80 x 12	17.8	22.7	120	80	12	11
125 x 75 x 8	12.2	15.5	125	75	8	11
125 x 75 x 10	15.0	19.1	125	75	10	11
125 x 75 x 12	17.8	22.7	125	75	12	11
135 x 65 x 8	12.2	15.5	135	65	8	11
135 x 65 x 10	15.0	19.1	135	65	10	11
150 x 75 x 9	15.4	19.6	150	75	9	12
150 x 75 x 10	17.0	21.7	150	75	10	12
150 x75x12	20.2	25.7	150	75	12	12
150 x 75 x15	24.8	31.7	150	75	15	12
150 x 90 x 10	18.2	23.2	150	90	10	12
150 x 90 x 12	21.6	27.5	150	90	12	12
150 x 90 x 15	26.6	33.9	150	90	15	12
150 x 100 x 10	19.0	24.2	150	100	10	12
150 x 100 x 12	22.5	28.7	150	100	12	12
200 x 100 x 10	23.0	29.2	200	100	10	15
200 x 100 x 12	27.3	34.8	200	100	12	15
200 x 100 x 15	33.75	43.0	200	100	15	15
200 x 150 x 12	32.0	40.8	200	100	12	15
200 x 150 x 15	39.6	50.5	200	100	15	15

You can also download the PDF file of different versions of steel angle (angle iron) dimensions charts or tables below.