C shapes (standard channels)

C3X5 C75X7.4

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 = 1.5d = 3tf = 0.273tf = 0.273tw = 0.258tw = 0.258
Cross-section, to scaledimensions in inches

Dimensions

Depthd
3in
Flange widthbf
1.5in
Web thicknesstw
0.258in
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
5lb/ft
Cross-sectional areaA
1.47in²

Strong axis x–x

Moment of inertiaIx
1.85in⁴
Elastic section modulusSx
1.23in³
Plastic section modulusZx
1.52in³
Radius of gyrationrx
1.12in

Weak axis y–y

Moment of inertiaIy
0.241in⁴
Elastic section modulusSy
0.228in³
Plastic section modulusZy
0.464in³
Radius of gyrationry
0.405in

Torsion and stability

Torsional constantJ
0.0425in⁴
Warping constantCw
0.379in⁶
Effective radius of gyrationrts
0.496in
Polar radius (shear center)r̄o
1.45in
Flexural constantH
0.673
Shear centereo
0.392in

Centers

Centroidx̄
0.439in
Plastic neutral axisxp
0.245in

Slenderness ratios

Web slendernessh/tw
6.94
Wall slendernessb/t
5.49

Equivalents in other standards