Timbers – 5" and larger

5x5

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

Dimensions

Depthd
4.5in
Widthb
4.5in

Mass and area

Cross-sectional areaA
20.25in²
Outside perimeterP
18in

Strong axis x–x

Moment of inertiaIx
34.17in⁴
Elastic section modulusSx
15.19in³
Plastic section modulusZx
22.78in³
Radius of gyrationrx
1.299in

Weak axis y–y

Moment of inertiaIy
34.17in⁴
Elastic section modulusSy
15.19in³
Plastic section modulusZy
22.78in³
Radius of gyrationry
1.299in

Torsion and stability

Torsional constantJ
57.75in⁴

Equivalents in other standards