C shapes (standard channels)

C3X3.5 C75X5.2

Standard: AISC Shapes Database v16.0Source: AISC (aisc.org) — Shapes Database v16.0 (Excel file)
Values published by AISC, in US customary (original) and SI units.
xybf = 1.37d = 3tf = 0.273tf = 0.273tw = 0.132tw = 0.132
Cross-section, to scaledimensions in inches

Dimensions

Depthd
3in
Flange widthbf
1.37in
Web thicknesstw
0.132in
Flange thicknesstf
0.273in
Distance k (design)kdes
0.688in
Distance k (detailing)kdet
0.6875in
Web clear depthT
1.625in
Distance between flange centroidsho
2.73in

Mass and area

Mass per lengthm
3.5lb/ft
Cross-sectional areaA
1.09in²

Strong axis x–x

Moment of inertiaIx
1.57in⁴
Elastic section modulusSx
1.04in³
Plastic section modulusZx
1.24in³
Radius of gyrationrx
1.2in

Weak axis y–y

Moment of inertiaIy
0.169in⁴
Elastic section modulusSy
0.182in³
Plastic section modulusZy
0.364in³
Radius of gyrationry
0.394in

Torsion and stability

Torsional constantJ
0.0226in⁴
Warping constantCw
0.276in⁶
Effective radius of gyrationrts
0.456in
Polar radius (shear center)r̄o
1.57in
Flexural constantH
0.646
Shear centereo
0.493in

Centers

Centroidx̄
0.443in
Plastic neutral axisxp
0.296in

Slenderness ratios

Web slendernessh/tw
13.6
Wall slendernessb/t
5.02

Equivalents in other standards