AA standard I-beams

I 4 x 2.31

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 = 4tf = 0.23tf = 0.23tw = 0.15tw = 0.15
Cross-section, to scaledimensions in inches

Dimensions

Depthd
4in
Flange widthbf
3in
Web thicknesstw
0.15in
Flange thicknesstf
0.23in
Root radiusr
0.25in

Mass and area

Mass per lengthm
2.3lb/ft
Cross-sectional areaA
1.965in²
Published area (standard)A pub.
1.965in²
Outside perimeterP
19.27in

Strong axis x–x

Moment of inertiaIx
5.622in⁴
Elastic section modulusSx
2.811in³
Plastic section modulusZx
3.163in³
Radius of gyrationrx
1.692in

Weak axis y–y

Moment of inertiaIy
1.037in⁴
Elastic section modulusSy
0.6914in³
Plastic section modulusZy
1.062in³
Radius of gyrationry
0.7265in

Torsion and stability

Torsional constantJ
0.03366in⁴
Warping constantCw
3.678in⁶

Equivalents in other standards