Timbers – 5" and larger

5x6

Standard: DOC PS 20 / NDS SupplementSource: Nominal − ½" (green), calculated
xyb = 4.5d = 5.5
Cross-section, to scaledimensions in inches

Dimensions

Depthd
5.5in
Widthb
4.5in

Mass and area

Cross-sectional areaA
24.75in²
Outside perimeterP
20in

Strong axis x–x

Moment of inertiaIx
62.39in⁴
Elastic section modulusSx
22.69in³
Plastic section modulusZx
34.03in³
Radius of gyrationrx
1.588in

Weak axis y–y

Moment of inertiaIy
41.77in⁴
Elastic section modulusSy
18.56in³
Plastic section modulusZy
27.84in³
Radius of gyrationry
1.299in

Torsion and stability

Torsional constantJ
84.17in⁴

Equivalents in other standards