AA standard channels

C 8 x 4.15

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 = 3d = 8tf = 0.35tf = 0.35tw = 0.19tw = 0.19
Cross-section, to scaledimensions in inches

Dimensions

Depthd
8in
Flange widthbf
3in
Web thicknesstw
0.19in
Flange thicknesstf
0.35in
Root radiusr
0.3in

Mass and area

Mass per lengthm
4.127lb/ft
Cross-sectional areaA
3.526in²
Published area (standard)A pub.
3.53in²
Outside perimeterP
27.36in

Strong axis x–x

Moment of inertiaIx
37.4in⁴
Elastic section modulusSx
9.35in³
Plastic section modulusZx
10.7in³
Radius of gyrationrx
3.257in

Weak axis y–y

Moment of inertiaIy
3.246in⁴
Elastic section modulusSy
1.571in³
Plastic section modulusZy
2.846in³
Radius of gyrationry
0.9595in

Torsion and stability

Torsional constantJ
0.1026in⁴

Centers

Centroidx̄
0.9336in

Equivalents in other standards