AA standard channels

C 9 x 6.97

Standard: Aluminum AssociationSource: Aluminum Association standard shape dimensions (as listed by Engineers Edge) — calculated properties
Mass calculated at 2700 kg/m³. Flange toe radius ignored (area difference < 1.5%).
xybf = 4d = 9tf = 0.44tf = 0.44tw = 0.29tw = 0.29
Cross-section, to scaledimensions in inches

Dimensions

Depthd
9in
Flange widthbf
4in
Web thicknesstw
0.29in
Flange thicknesstf
0.44in
Root radiusr
0.35in

Mass and area

Mass per lengthm
6.938lb/ft
Cross-sectional areaA
5.927in²
Published area (standard)A pub.
5.93in²
Outside perimeterP
33.12in

Strong axis x–x

Moment of inertiaIx
78.31in⁴
Elastic section modulusSx
17.4in³
Plastic section modulusZx
20.06in³
Radius of gyrationrx
3.635in

Weak axis y–y

Moment of inertiaIy
9.606in⁴
Elastic section modulusSy
3.491in³
Plastic section modulusZy
6.327in³
Radius of gyrationry
1.273in

Torsion and stability

Torsional constantJ
0.2963in⁴

Centers

Centroidx̄
1.249in

Equivalents in other standards