AA standard I-beams

I 4 x 2.79

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

Dimensions

Depthd
4in
Flange widthbf
3in
Web thicknesstw
0.17in
Flange thicknesstf
0.29in
Root radiusr
0.25in

Mass and area

Mass per lengthm
2.78lb/ft
Cross-sectional areaA
2.375in²
Published area (standard)A pub.
2.375in²
Outside perimeterP
19.23in

Strong axis x–x

Moment of inertiaIx
6.713in⁴
Elastic section modulusSx
3.357in³
Plastic section modulusZx
3.814in³
Radius of gyrationrx
1.681in

Weak axis y–y

Moment of inertiaIy
1.308in⁴
Elastic section modulusSy
0.8717in³
Plastic section modulusZy
1.337in³
Radius of gyrationry
0.742in

Torsion and stability

Torsional constantJ
0.06085in⁴
Warping constantCw
4.491in⁶

Equivalents in other standards