AA standard channels

C 7 x 3.21

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 = 2.75d = 7tf = 0.29tf = 0.29tw = 0.17tw = 0.17
Cross-section, to scaledimensions in inches

Dimensions

Depthd
7in
Flange widthbf
2.75in
Web thicknesstw
0.17in
Flange thicknesstf
0.29in
Root radiusr
0.3in

Mass and area

Mass per lengthm
3.19lb/ft
Cross-sectional areaA
2.725in²
Published area (standard)A pub.
2.73in²
Outside perimeterP
24.4in

Strong axis x–x

Moment of inertiaIx
22.09in⁴
Elastic section modulusSx
6.313in³
Plastic section modulusZx
7.224in³
Radius of gyrationrx
2.847in

Weak axis y–y

Moment of inertiaIy
2.101in⁴
Elastic section modulusSy
1.101in³
Plastic section modulusZy
1.998in³
Radius of gyrationry
0.878in

Torsion and stability

Torsional constantJ
0.05686in⁴

Centers

Centroidx̄
0.8422in

Equivalents in other standards