C shapes (standard channels)

C12X30 C310X45

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 = 3.17d = 12tf = 0.501tf = 0.501tw = 0.51tw = 0.51
Cross-section, to scaledimensions in inches

Dimensions

Depthd
12in
Flange widthbf
3.17in
Web thicknesstw
0.51in
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
30lb/ft
Cross-sectional areaA
8.81in²

Strong axis x–x

Moment of inertiaIx
162in⁴
Elastic section modulusSx
27in³
Plastic section modulusZx
33.8in³
Radius of gyrationrx
4.29in

Weak axis y–y

Moment of inertiaIy
5.12in⁴
Elastic section modulusSy
2.05in³
Plastic section modulusZy
4.32in³
Radius of gyrationry
0.762in

Torsion and stability

Torsional constantJ
0.861in⁴
Warping constantCw
151in⁶
Effective radius of gyrationrts
1.01in
Polar radius (shear center)r̄o
4.54in
Flexural constantH
0.919
Shear centereo
0.618in

Centers

Centroidx̄
0.674in
Plastic neutral axisxp
0.367in

Slenderness ratios

Web slendernessh/tw
19.4
Wall slendernessb/t
6.33

Equivalents in other standards