EN Standard Angle Steel Overview
EN Standards (European Standards) are among the most important technical systems in global engineering and construction.
The core standard for angle steel is EN 10056-1:2017, which specifies dimensions, tolerances, and designation rules for hot-rolled equal and unequal angle steel.
This standard is widely used in:
Construction engineering
Machinery manufacturing
Bridge projects
Compared with GB/T 706-2016, EN standards feature stricter dimensional tolerances and higher precision, making them essential for export projects and international procurement.
EN 10056-1 vs ASTM A36 Angle Steel
Different markets use different standards:
ASTM A36 → Common in the United States
EN 10056-1 → Widely used in Europe and international projects
For suppliers targeting overseas markets, understanding EN angle steel dimensions is critical.
EN 10056-1 Angle Steel Dimensional Range
Equal Angle Steel Dimensions
Leg width: 30 mm – 200 mm
Thickness: 3 mm – 24 mm
Typical sizes:
30×30 mm
50×50 mm
100×100 mm
Unequal Angle Steel Dimensions
Long leg: 40 mm – 200 mm
Short leg: 25 mm – 150 mm
Thickness: 3 mm – 24 mm
Typical sizes:
40×25 mm
100×75 mm
150×100 mm
The 2017 revision expanded the size range, supporting large-span and heavy-duty structures.
EN Angle Steel Dimension Notation Method
Standard Size Format
EN angle steel uses the format:
Leg Width 1 × Leg Width 2 × Thickness
Equal angle: L150×150×15
Unequal angle: L100×75×8
This notation clearly reflects cross-sectional geometry, helping engineers quickly identify specifications.
EN 10056-1 Angle Steel Tolerance Requirements
Leg Width Tolerance
≤ 80 mm → ±1.0 mm
80 mm → ±1.5 mm
Thickness Tolerance
≤ 10 mm → ±0.2 mm
10 mm → ±0.3 mm
Straightness (Camber)
Maximum: 0.3% of total length
Perpendicularity
Angle deviation: 90° ± 1°
These strict tolerances ensure high precision, better assembly fit, and structural stability.
Dimensions of European Standard Equal Leg Angles
|
Designation
|
Mass
|
Sectional Area
|
Dimensions
|
|
kg/m
|
cm2
|
a
|
t
|
rroot
|
|
|
|
mm
|
mm
|
mm
|
|
20×20×3
|
0.882
|
1.12
|
20
|
3
|
3.5
|
|
25×25×3
|
1.12
|
1.42
|
25
|
3
|
3.5
|
|
25×25×4
|
1.45
|
1.85
|
25
|
4
|
3.5
|
|
30×30×3
|
1.36
|
1.74
|
30
|
3
|
5
|
|
30×30×4
|
1.78
|
2.27
|
30
|
4
|
5
|
|
35×35×4
|
2.09
|
2.67
|
35
|
4
|
5
|
|
40×40×4
|
2.42
|
3.08
|
40
|
4
|
6
|
|
40×40×5
|
2.97
|
3.79
|
40
|
5
|
6
|
|
45×45×4.5
|
3.06
|
3.9
|
45
|
4.5
|
7
|
|
50×50×4
|
3.06
|
3.89
|
50
|
4
|
7
|
|
50×50×5
|
3.77
|
4.8
|
50
|
5
|
7
|
|
50×50×6
|
4.47
|
5.69
|
50
|
6
|
7
|
|
60×60×5
|
4.57
|
5.82
|
60
|
5
|
8
|
|
60×60×6
|
5.42
|
6.91
|
60
|
6
|
8
|
|
60×60×8
|
7.09
|
9.03
|
60
|
8
|
8
|
|
65×65×7
|
6.83
|
8.7
|
65
|
7
|
9
|
|
70×70×6
|
6.38
|
8.13
|
70
|
6
|
9
|
|
70×70×7
|
7.38
|
9.4
|
70
|
7
|
9
|
|
75×75×6
|
6.85
|
8.73
|
75
|
6
|
9
|
|
75×75×8
|
8.99
|
11.4
|
75
|
8
|
9
|
|
80×80×8
|
9.63
|
12.3
|
80
|
8
|
10
|
|
80×80×10
|
11.9
|
15.1
|
80
|
10
|
10
|
|
90×90×7
|
9.61
|
12.2
|
90
|
7
|
11
|
|
90×90×8
|
10.9
|
13.9
|
90
|
8
|
11
|
|
90×90×9
|
12.2
|
15.5
|
90
|
9
|
11
|
|
90×90×10
|
13.4
|
17.1
|
90
|
10
|
11
|
|
Designation
|
Mass
|
Sectional Area
|
Dimensions
|
|
kg/m
|
cm2
|
a
|
b
|
t
|
rroot
|
|
|
|
mm
|
mm
|
mm
|
mm
|
|
30×20×3
|
1.12
|
1.43
|
30
|
20
|
3
|
4
|
|
30×20×4
|
1.46
|
1.86
|
30
|
20
|
4
|
4
|
|
40×20×4
|
1.77
|
2.26
|
40
|
20
|
4
|
4
|
|
40×25×4
|
1.93
|
2.46
|
40
|
25
|
4
|
4
|
|
45×30×4
|
2.25
|
2.87
|
45
|
30
|
4
|
4.5
|
|
50×30×5
|
2.96
|
3.78
|
50
|
30
|
5
|
5
|
|
60×30×5
|
3.36
|
4.28
|
60
|
30
|
5
|
5
|
|
60×40×5
|
3.76
|
4.79
|
60
|
40
|
5
|
6
|
|
60×40×6
|
4.46
|
5.68
|
60
|
40
|
6
|
6
|
|
65×50×5
|
4.35
|
5.54
|
65
|
50
|
5
|
6
|
|
70×50×6
|
5.41
|
6.89
|
70
|
50
|
6
|
7
|
|
75×50×6
|
5.65
|
7.19
|
75
|
50
|
6
|
7
|
|
75×50×8
|
7.39
|
9.41
|
75
|
50
|
8
|
7
|
|
80×40×6
|
5.41
|
6.89
|
80
|
40
|
6
|
7
|
|
80×40×8
|
7.07
|
9.01
|
80
|
40
|
8
|
7
|
|
100×50×6
|
6.84
|
8.71
|
100
|
50
|
6
|
8
|
|
100×50×8
|
8.97
|
11.4
|
100
|
50
|
8
|
8
|
|
100×65×7
|
8.77
|
11.2
|
100
|
65
|
7
|
10
|
EN vs GB Angle Steel Tolerance Comparison
Compared with GB/T 706-2016:
EN standard → Higher precision and tighter tolerances
GB standard → Slightly wider tolerance range
This is why EN angle steel is widely recognized as a high-precision product in global markets.
Why EN Angle Steel Matters in International Projects
Using EN 10056-1 angle steel provides:
Compliance with European regulations
Improved structural accuracy
Reduced installation deviation
Higher engineering reliability
Especially important in:
EPC projects
Infrastructure exports
Cross-border construction
Trend: Dual-Standard Angle Steel (EN + GB)
To meet global demand, some manufacturers now produce:
EN + GB dual-certified angle steel
Multi-standard compliant products
Benefits:
Easier export compliance
Broader market access
Reduced project risk
FAQ
- What is EN 10056-1 angle steel?
It is a European standard defining dimensions and tolerances for hot-rolled angle steel.
- What sizes are available for EN angle steel?
Equal angles: 30–200 mm, unequal angles: 25–200 mm, thickness: 3–24 mm.
- How are EN angle steel dimensions expressed?
Using Leg Width × Leg Width × Thickness format.
- Why is EN angle steel more precise than GB standard?
Because it applies stricter tolerance controls.
- When should EN standard angle steel be used?
For European projects, export orders, and high-precision structures.
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