Timbers – 5" and larger

5x16

Standard: DOC PS 20 / NDS SupplementSource: Nominal − ½" (green), calculated
xyb = 4.5d = 15.5
Cross-section, to scaledimensions in inches

Dimensions

Depthd
15.5in
Widthb
4.5in

Mass and area

Cross-sectional areaA
69.75in²
Outside perimeterP
40in

Strong axis x–x

Moment of inertiaIx
1,396in⁴
Elastic section modulusSx
180.2in³
Plastic section modulusZx
270.3in³
Radius of gyrationrx
4.474in

Weak axis y–y

Moment of inertiaIy
117.7in⁴
Elastic section modulusSy
52.31in³
Plastic section modulusZy
78.47in³
Radius of gyrationry
1.299in

Torsion and stability

Torsional constantJ
384.7in⁴

Equivalents in other standards