C12x20.7 — Dimensions and Section Properties

Dimensions and key properties

C12x20.7 drawn to the proportions tabulated below, with the y axis at the centroid, x̄ = 0.7″ from the back. The inner flange faces are drawn at the standard 1:6 slope, which is not exact for every size. The flange toe radius is not drawn.

Weight: = 20.7 lb/ft
A: = 6.08 in²
d: = 12 in
bf: = 2.94 in
Ix: = 129 in⁴
Sx: = 21.5 in³
Zx: = 25.6 in³
rx: = 4.61 in
ry: = 0.797 in

Section properties

Property	Value	Unit	Description
Weight	20.7	lb/ft	Nominal weight per foot
A	6.08	in²	Cross-sectional area
d	12	in	Overall depth
bf	2.94	in	Flange width
tf	0.501	in	Flange thickness
tw	0.282	in	Web thickness
Ix	129	in⁴	Moment of inertia, strong axis
Sx	21.5	in³	Elastic section modulus, strong axis
Zx	25.6	in³	Plastic section modulus, strong axis
rx	4.61	in	Radius of gyration, strong axis
Iy	3.86	in⁴	Moment of inertia, weak axis
Sy	1.72	in³	Elastic section modulus, weak axis
Zy	3.47	in³	Plastic section modulus, weak axis
ry	0.797	in	Radius of gyration, weak axis

Other sizes in the C12 series

← C12x25 (heavier)All 3 C12 sizes

Relevant tools

Steel Shape Properties Table
search and compare C12x20.7 against other sections
Beam Shear, Moment and Deflection Diagram Calculator
find the moment this section has to carry, and how far it deflects under load
ASTM A36
the preferred grade for channels

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