C shapes (standard channels)

C3X4.1 C75X6.1

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 = 1.41d = 3tf = 0.273tf = 0.273tw = 0.17tw = 0.17
Cross-section, to scaledimensions in inches

Dimensions

Depthd
3in
Flange widthbf
1.41in
Web thicknesstw
0.17in
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
4.1lb/ft
Cross-sectional areaA
1.2in²

Strong axis x–x

Moment of inertiaIx
1.65in⁴
Elastic section modulusSx
1.1in³
Plastic section modulusZx
1.32in³
Radius of gyrationrx
1.18in

Weak axis y–y

Moment of inertiaIy
0.191in⁴
Elastic section modulusSy
0.196in³
Plastic section modulusZy
0.399in³
Radius of gyrationry
0.398in

Torsion and stability

Torsional constantJ
0.0269in⁴
Warping constantCw
0.307in⁶
Effective radius of gyrationrts
0.469in
Polar radius (shear center)r̄o
1.53in
Flexural constantH
0.655
Shear centereo
0.461in

Centers

Centroidx̄
0.437in
Plastic neutral axisxp
0.262in

Slenderness ratios

Web slendernessh/tw
10.5
Wall slendernessb/t
5.16

Equivalents in other standards