AA standard I-beams

I 8 x 6.18

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 = 5d = 8tf = 0.35tf = 0.35tw = 0.23tw = 0.23
Cross-section, to scaledimensions in inches

Dimensions

Depthd
8in
Flange widthbf
5in
Web thicknesstw
0.23in
Flange thicknesstf
0.35in
Root radiusr
0.3in

Mass and area

Mass per lengthm
6.153lb/ft
Cross-sectional areaA
5.256in²
Published area (standard)A pub.
5.256in²
Outside perimeterP
35.02in

Strong axis x–x

Moment of inertiaIx
59.69in⁴
Elastic section modulusSx
14.92in³
Plastic section modulusZx
16.73in³
Radius of gyrationrx
3.37in

Weak axis y–y

Moment of inertiaIy
7.302in⁴
Elastic section modulusSy
2.921in³
Plastic section modulusZy
4.486in³
Radius of gyrationry
1.179in

Torsion and stability

Torsional constantJ
0.1904in⁴
Warping constantCw
106.7in⁶

Equivalents in other standards