Timbers – 5" and larger

8x8

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

Dimensions

Depthd
7.5in
Widthb
7.5in

Mass and area

Cross-sectional areaA
56.25in²
Outside perimeterP
30in

Strong axis x–x

Moment of inertiaIx
263.7in⁴
Elastic section modulusSx
70.31in³
Plastic section modulusZx
105.5in³
Radius of gyrationrx
2.165in

Weak axis y–y

Moment of inertiaIy
263.7in⁴
Elastic section modulusSy
70.31in³
Plastic section modulusZy
105.5in³
Radius of gyrationry
2.165in

Torsion and stability

Torsional constantJ
445.6in⁴

Equivalents in other standards