Timbers – 5" and larger

5x12

Standard: DOC PS 20 / NDS SupplementSource: Nominal − ½" (green), calculated
xyb = 4.5d = 11.5
Cross-section, to scaledimensions in inches

Dimensions

Depthd
11.5in
Widthb
4.5in

Mass and area

Cross-sectional areaA
51.75in²
Outside perimeterP
32in

Strong axis x–x

Moment of inertiaIx
570.3in⁴
Elastic section modulusSx
99.19in³
Plastic section modulusZx
148.8in³
Radius of gyrationrx
3.32in

Weak axis y–y

Moment of inertiaIy
87.33in⁴
Elastic section modulusSy
38.81in³
Plastic section modulusZy
58.22in³
Radius of gyrationry
1.299in

Torsion and stability

Torsional constantJ
263.4in⁴

Equivalents in other standards