Steel C channels are widely used structural steel sections for building frames, equipment supports, machinery bases, and general fabrication projects. Choosing the correct C channel standard size requires understanding the channel depth, flange width, thickness, weight, and section type.
Standard C channel sizes are usually identified by channel depth × weight per foot, such as C6 × 10.5 or C10 × 20. The larger the weight designation, the thicker the web and flanges, providing higher load-carrying capacity.
This guide explains standard C channel dimensions, size charts, C channel types, weight differences, and how to select the right steel channel for structural applications.
What Is a Standard C Channel?
A standard C channel is a hot-rolled structural steel section with a vertical web and two flanges forming a “C” shape.
The main dimensions include:
Depth (D): Overall height of the channel
Flange width (B): Width of the channel legs
Web thickness (tw): Thickness of the vertical section
Flange thickness (tf): Thickness of the horizontal sections
Weight: Pounds per foot (lb/ft) or kilograms per meter (kg/m)
Standard C Channel Sizes Chart (Dimensions & Weight)
The following table shows common American standard C channel sizes.
|
Designation
|
Depth (in)
|
Flange Width (in)
|
Flange Thickness (in)
|
Web Thickness (in)
|
Weight (lb/ft)
|
|
C3 × 4.1
|
3
|
1.41
|
0.273
|
0.17
|
4.1
|
|
C3 × 5.0
|
3
|
1.498
|
0.273
|
0.258
|
5
|
|
C4 × 5.4
|
4
|
1.584
|
0.296
|
0.184
|
5.4
|
|
C4 × 7.25
|
4
|
1.721
|
0.296
|
0.321
|
7.25
|
|
C5 × 6.7
|
5
|
1.75
|
0.32
|
0.19
|
6.7
|
|
C5 × 9.0
|
5
|
1.885
|
0.32
|
0.325
|
9
|
|
C6 × 8.2
|
6
|
1.92
|
0.343
|
0.2
|
8.2
|
|
C6 × 10.5
|
6
|
2.034
|
0.343
|
0.314
|
10.5
|
|
C6 × 13.0
|
6
|
2.157
|
0.343
|
0.437
|
13
|
|
C8 × 11.5
|
8
|
2.26
|
0.39
|
0.22
|
11.5
|
|
C8 × 13.75
|
8
|
2.343
|
0.39
|
0.303
|
13.75
|
|
C8 × 18.75
|
8
|
2.527
|
0.39
|
0.487
|
18.75
|
|
C10 × 15.3
|
10
|
2.6
|
0.436
|
0.24
|
15.3
|
|
C10 × 20.0
|
10
|
2.739
|
0.436
|
0.379
|
20
|
|
C10 × 25.0
|
10
|
2.886
|
0.436
|
0.526
|
25
|
|
C12 × 20.7
|
12
|
2.942
|
0.501
|
0.282
|
20.7
|
|
C12 × 25.0
|
12
|
3.047
|
0.501
|
0.387
|
25
|
|
C12 × 30.0
|
12
|
3.17
|
0.501
|
0.51
|
30
|
|
C15 × 33.9
|
15
|
3.4
|
0.65
|
0.4
|
33.9
|
|
C15 × 40.0
|
15
|
3.52
|
0.65
|
0.52
|
40
|
|
C15 × 50.0
|
15
|
3.716
|
0.65
|
0.716
|
50
|
Metric C Channel Sizes and Dimensions (mm)
Besides American standard channels specified by depth and weight per foot, many international steel projects use metric C channel sizes defined by their overall dimensions and weight per meter.
Metric C channels are usually designated as:
C h × b × tw × tf
Where:
h = channel height (mm)
b = flange width (mm)
tw = web thickness (mm)
tf = flange thickness (mm)
For example:
C 200×80×7.5×11
means:
Height: 200 mm
Width: 80 mm
Web thickness: 7.5 mm
Flange thickness: 11 mm
|
General Properties
|
|
Designation
|
Dimensions
|
Dimensions for Detailing
|
|
Designation
|
Weight G (kg/m)
|
h (mm)
|
b (mm)
|
tw (mm)
|
tf (mm)
|
r1 (mm)
|
r2 (mm)
|
Area A (×10^2 mm²)
|
d (mm)
|
u (mm)
|
|
C 50×25×5×6
|
3.95
|
50
|
25
|
5
|
6
|
6
|
3
|
4.94
|
25.3
|
12.5
|
|
C 75×40×5×7
|
6.95
|
75
|
40
|
5
|
7
|
8
|
4
|
8.68
|
42.7
|
20
|
|
C 100×50×5×7.5
|
9.37
|
100
|
50
|
5
|
7.5
|
8
|
4
|
11.71
|
65.3
|
25
|
|
C 125×65×6×8
|
13.4
|
125
|
65
|
6
|
8
|
8
|
4
|
16.75
|
87.5
|
32.5
|
|
C 150×75×6.5×10
|
18.62
|
150
|
75
|
6.5
|
10
|
10
|
5
|
23.27
|
103.7
|
37.5
|
|
C 150×75×9×12.5
|
24.01
|
150
|
75
|
9
|
12.5
|
2
|
1
|
30.02
|
121
|
125
|
|
C 180×75×7×10.5
|
21.52
|
180
|
75
|
7
|
10.5
|
2
|
1
|
26.9
|
155
|
159
|
|
C 200×80×7.5×11
|
24.77
|
200
|
80
|
7.5
|
11
|
2
|
1
|
30.97
|
174
|
178
|
|
C 200×90×8×13.5
|
30.53
|
200
|
90
|
8
|
13.5
|
2
|
1
|
38.16
|
169
|
173
|
|
C 230×80×8×12
|
28.56
|
230
|
80
|
8
|
12
|
2
|
1
|
35.7
|
202
|
206
|
|
C 250×90×9×13
|
34.86
|
250
|
90
|
9
|
13
|
2
|
1
|
43.58
|
220
|
224
|
|
C 250×90×11×14.5
|
40.34
|
250
|
90
|
11
|
14.5
|
2
|
1
|
50.43
|
217
|
221
|
|
C 300×90×9×12
|
37.17
|
300
|
90
|
9
|
12
|
2
|
1
|
46.46
|
272
|
276
|
|
C 300×90×10×15.5
|
43.85
|
300
|
90
|
10
|
15.5
|
2
|
1
|
54.82
|
265
|
269
|
|
C 300×90×12×16
|
48.78
|
300
|
90
|
12
|
16
|
2
|
1
|
60.98
|
264
|
268
|
|
C 380×100×10.5×16
|
54.85
|
380
|
100
|
10.5
|
16
|
2
|
1
|
68.56
|
344
|
348
|
|
C 380×100×13×16.5
|
62.5
|
380
|
100
|
13
|
16.5
|
2
|
1
|
78.13
|
343
|
347
|
|
C 380×100×13×20
|
67.37
|
380
|
100
|
13
|
20
|
2
|
1
|
84.22
|
336
|
340
|
Standard C Channel Sizes in mm
For international projects, C channel dimensions are often converted into millimeters.
Typical standard steel C channel ranges include:
|
Parameter
|
Typical Range
|
|
Width
|
34 mm – 80 mm
|
|
Depth
|
76 mm – 305 mm
|
|
Thickness
|
3 mm – 10 mm
|
|
Length
|
1.22 m – 6.1 m
|
Common metric C channel sizes include:
75 × 40 mm
100 × 50 mm
150 × 75 mm
200 × 80 mm
250 × 75 mm
300 × 90 mm
Actual dimensions depend on manufacturing standards and customer requirements.
C Channel Standards and Material Grades
Most structural C channels are manufactured according to recognized standards, including:
ASTM A36
ASTM A572 Grade 50
ASTM A992
AISC steel section specifications
Common material properties include:
good weldability
high strength-to-weight ratio
reliable structural performance
Conclusion
Choosing the correct C channel standard size requires balancing dimensions, weight, loading conditions, and fabrication requirements.
Standard C channels are available in many sizes, from lightweight framing sections to heavy structural members. Understanding the relationship between depth,
flange width, thickness, and weight helps engineers select the most suitable steel channel for each project.
For accurate selection, always refer to a complete C channel size chart and verify the required design standards before fabrication.
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