C3x5 — Dimensions and Section Properties

Dimensions and key properties

C3x5 drawn to the proportions tabulated below, with the y axis at the centroid, x̄ = 0.44″ 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: = 5 lb/ft
A: = 1.47 in²
d: = 3 in
bf: = 1.5 in
Ix: = 1.85 in⁴
Sx: = 1.23 in³
Zx: = 1.52 in³
rx: = 1.12 in
ry: = 0.405 in

Section properties

Property	Value	Unit	Description
Weight	5	lb/ft	Nominal weight per foot
A	1.47	in²	Cross-sectional area
d	3	in	Overall depth
bf	1.5	in	Flange width
tf	0.273	in	Flange thickness
tw	0.258	in	Web thickness
Ix	1.85	in⁴	Moment of inertia, strong axis
Sx	1.23	in³	Elastic section modulus, strong axis
Zx	1.52	in³	Plastic section modulus, strong axis
rx	1.12	in	Radius of gyration, strong axis
Iy	0.241	in⁴	Moment of inertia, weak axis
Sy	0.228	in³	Elastic section modulus, weak axis
Zy	0.464	in³	Plastic section modulus, weak axis
ry	0.405	in	Radius of gyration, weak axis

Other sizes in the C3 series

← C3x6 (heavier)All 4 C3 sizes C3x4.1 (lighter) →

Relevant tools

Steel Shape Properties Table
search and compare C3x5 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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