C shapes (standard channels)

C3X6 C75X8.9

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 = 1.6d = 3tf = 0.273tf = 0.273tw = 0.356tw = 0.356
Cross-section, to scaledimensions in inches

Dimensions

Depthd
3in
Flange widthbf
1.6in
Web thicknesstw
0.356in
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
6lb/ft
Cross-sectional areaA
1.76in²

Strong axis x–x

Moment of inertiaIx
2.07in⁴
Elastic section modulusSx
1.38in³
Plastic section modulusZx
1.74in³
Radius of gyrationrx
1.09in

Weak axis y–y

Moment of inertiaIy
0.3in⁴
Elastic section modulusSy
0.263in³
Plastic section modulusZy
0.543in³
Radius of gyrationry
0.413in

Torsion and stability

Torsional constantJ
0.0725in⁴
Warping constantCw
0.462in⁶
Effective radius of gyrationrts
0.519in
Polar radius (shear center)r̄o
1.4in
Flexural constantH
0.69
Shear centereo
0.322in

Centers

Centroidx̄
0.455in
Plastic neutral axisxp
0.294in

Slenderness ratios

Web slendernessh/tw
5.03
Wall slendernessb/t
5.86

Equivalents in other standards