Timbers – 5" and larger

8x12

Standard: DOC PS 20 / NDS SupplementSource: Nominal − ½" (green), calculated
xyb = 7.5d = 11.5
Cross-section, to scaledimensions in inches

Dimensions

Depthd
11.5in
Widthb
7.5in

Mass and area

Cross-sectional areaA
86.25in²
Outside perimeterP
38in

Strong axis x–x

Moment of inertiaIx
950.5in⁴
Elastic section modulusSx
165.3in³
Plastic section modulusZx
248in³
Radius of gyrationrx
3.32in

Weak axis y–y

Moment of inertiaIy
404.3in⁴
Elastic section modulusSy
107.8in³
Plastic section modulusZy
161.7in³
Radius of gyrationry
2.165in

Torsion and stability

Torsional constantJ
962.8in⁴

Equivalents in other standards