C shapes (standard channels)

C12X20.7 C310X30.8

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 = 2.94d = 12tf = 0.501tf = 0.501tw = 0.282tw = 0.282
Cross-section, to scaledimensions in inches

Dimensions

Depthd
12in
Flange widthbf
2.94in
Web thicknesstw
0.282in
Flange thicknesstf
0.501in
Distance k (design)kdes
1.13in
Distance k (detailing)kdet
1.125in
Web clear depthT
9.75in
Distance between flange centroidsho
11.5in

Mass and area

Mass per lengthm
20.7lb/ft
Cross-sectional areaA
6.08in²

Strong axis x–x

Moment of inertiaIx
129in⁴
Elastic section modulusSx
21.5in³
Plastic section modulusZx
25.6in³
Radius of gyrationrx
4.61in

Weak axis y–y

Moment of inertiaIy
3.86in⁴
Elastic section modulusSy
1.72in³
Plastic section modulusZy
3.47in³
Radius of gyrationry
0.797in

Torsion and stability

Torsional constantJ
0.369in⁴
Warping constantCw
112in⁶
Effective radius of gyrationrts
0.983in
Polar radius (shear center)r̄o
4.93in
Flexural constantH
0.899
Shear centereo
0.87in

Centers

Centroidx̄
0.698in
Plastic neutral axisxp
0.253in

Slenderness ratios

Web slendernessh/tw
35.2
Wall slendernessb/t
5.87

Equivalents in other standards