C CHANNEL SIZES CHART FOR STEEL CHANNELS

C channel sizes chart for dimensions, weight and section properties of steel channels. C channels are designated by the letter C followed by the nominal depth in inches and the weight in pounds per foot. Thus C 7 × 12.25 designates an American Standard C Channel with a depth of 7 inches and a nominal weight of 12.25 pounds per foot.

Steel C Channel Sizes
American Standard Steel C Channel Sizes
Desig-
nation		 Area,
A, in2		 Depth,
d, in		 Weight
lb/ft		 Flange Web
Thickness
tw, in		 Axis X-X Axis Y-Y x,
in
Width,
bf, in		 Thickness,
tf, in		 I,
in4		 S,
in3		 r,
in		 I,
in4		 S,
in3		 r,
in
C15 x 50 14.7 15.00 50 3.716 0.650 0.716 404 53.8 5.24 11.0 3.78 0.867 0.798
C15 x 40 11.8 15.00 40 3.520 0.650 0.520 349 46.5 5.44 9.23 3.37 0.886 0.777
C15 x 33.9 9.96 15.00 33.9 3.400 0.650 0.400 315 42.0 5.62 8.13 3.11 0.904 0.787
C12 x 30 8.82 12.00 30 3.170 0.501 0.510 162 27.0 4.29 5.14 2.06 0.763 0.674
C12 x 25 7.35 12.00 25 3.047 0.501 0.387 144 24.1 4.43 4.47 1.88 0.780 0.674
C12 x 20.7 6.09 12.00 20.7 2.942 0.501 0.282 129 21.5 4.61 3.88 1.73 0.799 0.698
C10 x 30 8.82 10.00 30 3.033 0.436 0.673 103 20.7 3.42 3.94 1.65 0.669 0.649
C10 x 25 7.35 10.00 25 2.886 0.436 0.526 91.2 18.2 3.52 3.36 1.48 0.676 0.617
C10 x 20 5.88 10.00 20 2.739 0.436 0.379 78.9 15.8 3.66 2.81 1.32 0.692 0.606
C10 x 15.3 4.49 10.00 15.3 2.600 0.436 0.240 67.4 13.5 3.87 2.28 1.16 0.713 0.634
C9 x 20 5.88 9.00 20 2.648 0.413 0.448 60.9 13.5 3.22 2.42 1.17 0.642 0.583
C9 x 15 4.41 9.00 15 2.485 0.413 0.285 51.0 11.3 3.40 1.93 1.01 0.661 0.586
C9 x 13.4 3.94 9.00 13.4 2.433 0.413 0.233 47.9 10.6 3.48 1.76 0.962 0.669 0.601
Desig-
nation		 Area,
A, in2		 Depth,
d, in		 Weight
lb/ft		 Flange Web
Thickness
tw, in		 Axis X-X Axis Y-Y x,
in
Width,
bf, in		 Thickness,
tf, in		 I,
in4		 S,
in3		 r,
in		 I,
in4		 S,
in3		 r,
in
C8 x 18.75 5.51 8.00 18.75 2.527 0.390 0.487 44.0 11.0 2.82 1.98 1.01 0.599 0.565
C8 x 13.75 4.04 8.00 13.75 2.343 0.390 0.303 36.1 9.03 2.99 1.53 0.854 0.615 0.553
C8 x 11.5 3.38 8.00 11.5 2.260 0.390 0.220 32.6 8.14 3.11 1.32 0.781 0.625 0.571
C7 x 14.75 4.33 7.00 14.75 2.299 0.366 0.419 27.2 7.78 2.51 1.38 0.779 0.564 0.532
C7 x 12.25 3.60 7.00 12.25 2.194 0.366 0.314 24.2 6.93 2.60 1.17 0.703 0.571 0.525
C7 x 9.8 2.87 7.00 9.8 2.090 0.366 0.210 21.3 6.08 2.72 0.968 0.625 0.581 0.540
C6 x 13 3.83 6.00 13 2.157 0.343 0.437 17.4 5.80 2.13 1.05 0.642 0.525 0.514
C6 x 10.5 3.09 6.00 10.5 2.034 0.343 0.314 15.2 5.06 2.22 0.866 0.564 0.529 0.499
C6 x 8.2 2.40 6.00 8.2 1.920 0.343 0.200 13.1 4.38 2.34 0.693 0.492 0.537 0.511
C5 x 9 2.64 5.00 9 1.885 0.320 0.325 8.90 3.56 1.83 0.632 0.450 0.489 0.478
C5 x 6.7 1.97 5.00 6.7 1.750 0.320 0.190 7.49 3.00 1.95 0.479 0.378 0.493 0.484
C4 x 7.25 2.13 4.00 7.25 1.721 0.296 0.321 4.59 2.29 1.47 0.433 0.343 0.450 0.459
C4  x 5.4 1.59 4.00 5.4 1.584 0.296 0.184 3.85 1.93 1.56 0.319 0.283 0.449 0.457
C3 x 6 1.76 3.00 6  1.596 0.273 0.356 2.07 1.38 1.08 0.305 0.268 0.416 0.455
C3 x 5 1.47 3.00 5 1.498 0.273 0.258 1.85 1.24 1.12 0.247 0.233 0.410 0.438
C3 x 4.1 1.21 3.00 4.1 1.410 0.273 0.170 1.66 1.10 1.17 0.197 0.202 0.404 0.436

Symbols: I = moment of inertia; S = section modulus; r = radius of gyration; x = distance from center of gravity of section to outer face of structural shape.

Supplements:

Definitions:

Second Moment of Area: The capacity of a cross-section to resist bending.

Radius of Gyration (Area): The distance from an axis at which the area of a body may be assumed to be concentrated and the second moment area of this configuration equal to the second moment area of the actual body about the same axis.

Section Modulus: The moment of inertia of the area of the cross section of a structural member divided by the distance from the center of gravity to the farthest point of the section; a measure of the flexural strength of the beam.

Reference:

  • Oberg, E. , Jones ,F.D. , Horton H.L. , Ryffel H.H., (2016) . Machinery's Handbook . 30th edition.  Industrial Press Inc. pp 2615
  • ASTM 6/A 6M - 05a , Standard Specification for General Requirements for Rolled Structural Steel Bars, Plates, Shapes, and Sheet Piling