AA standard channels

C 9 x 4.98

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 = 3.25d = 9tf = 0.35tf = 0.35tw = 0.23tw = 0.23
Cross-section, to scaledimensions in inches

Dimensions

Depthd
9in
Flange widthbf
3.25in
Web thicknesstw
0.23in
Flange thicknesstf
0.35in
Root radiusr
0.35in

Mass and area

Mass per lengthm
4.959lb/ft
Cross-sectional areaA
4.237in²
Published area (standard)A pub.
4.24in²
Outside perimeterP
30.24in

Strong axis x–x

Moment of inertiaIx
54.41in⁴
Elastic section modulusSx
12.09in³
Plastic section modulusZx
14.01in³
Radius of gyrationrx
3.584in

Weak axis y–y

Moment of inertiaIy
4.398in⁴
Elastic section modulusSy
1.894in³
Plastic section modulusZy
3.432in³
Radius of gyrationry
1.019in

Torsion and stability

Torsional constantJ
0.1309in⁴

Centers

Centroidx̄
0.9283in

Equivalents in other standards