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Structural Lumber - Properties

Properties of structural lumber.

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structural lumber properties

Nominal Dimension
(in)		Actual Dimension
(in)		Area
(in2)		Section Modulus
- S -
(in3)		Moment of Inertia
- I -
(in4)		Weight
(lb/ft)
1 x 3 0.75 x 2.5 1.875 0.47
1x 4 0.75 x 3.5 2.625 0.64
1 x 6 0.75 x 5.5 4.125 1.0
1 x 8 0.75 x 7.25 5.4375 1.3
1 x 10 0.75 x 9.25 6.9375 1.7
1 x 12 0.75 x 11.25 8.4375 2.1
2 x 3 1.5 x 2.5 3.75 1.56 1.95 0.9
2 x 4 1.5 x 3.5 5.25 3.06 5.36 1.3
2 x 6 1.5 x 5.5 8.25 7.56 20.8 2.0
2 x 8 1.5 x 7.25 10.875 13.1 47.6 2.6
2 x 10 1.5 x 9.25 13.875 21.4 98.9 3.4
2 x 12 1.5 x 11.25 16.875 31.6 178 4.1
3 x 2 2.5 x 1.5 3.75 0.94 0.70 0.9
3 x 4 2.5 x 3.5 8.75 5.10 8.93 2.1
3 x 6 2.5 x 5.5 13.75 12.6 34.7 3.3
3 x 8 2.5 x 7.25 18.125 21.9 79.4 4.4
3 x 10 2.5 x 9.25 23.125 35.7 165 5.6
3 x 12 2.5 x 11.25 28.125 52.7 297 6.8
4 x 2 3.5 x 1.5 5.25 1.31 0.98 1.3
4 x 3 3.5 x 2.5 8.75 3.64 4.56 2.1
4 x 4 3.5 x 3.5 12.25 7.15 12.5 3.0
4 x 6 3.5 x 5.5 19.25 17.6 48.5 4.7
4 x 8 3.5 x 7.25 25.375 30.7 111 6.2
4 x 10 3.5 x 9.25 32.375 49.9 231 7.9
4 x 12 3.5 x 11.25 39.375 73.8 415 9.6
6 x 2 5.5 x 1.5 8.25 2.1 1.55 2.0
6 x 3 5.5 x 2.5 13.8 5.7 7.16 3.3
6 x 4 5.5 x 3.5 19.3 11.2 19.7 4.7
6 x 6 5.5 x 5.5 30.3 27.7 76.3 7.4
6 x 8 5.5 x 7.5 41.3 51.6 193 10.0
6 x 10 5.5 x 9.5 52.3 82.7 393 12.7
6 x 12 5.5 x 11.5 63.3 121 697 15.4
8 x 2 7.25 x 1.5 10.9 2.7 2.04 2.6
8 x 3 7.25 x 2.5 18.1 7.6 9.44 4.4
8 x 4 7.25 x 3.5 25.4 14.8 25.9 6.2
8 x 6 7.5 x 5.5 41.3 37.8 104 10.0
8 x 8 7.5 x 7.5 56.3 70.3 264 13.7
8 x 10 7.5 x 9.5 71.3 113 536 17.3
8 x 12 7.5 x 11.5 86.3 165 951 21.0
8 x 14 7.5 x 13.5 101 228 1538 24.6
8 x 16 7.5 x 15.5 116 300 2327 28.3
10 x 10 9.5 x 9.5 90.3 143 679 21.9
10 x 12 9.5 x 11.5 109 209 1204 26.6
10 x 14 9.5 x 13.5 128 289 1948 31.2
10 x 16 9.5 x 15.5 147 380 2948 35.8
10 x 18 9.5 x 17.5 166 485 4243 40.4
12 x 12 11.5 x 11.5 132 32.1
12 x 14 11.5 x 13.5 152 37.7
12 x 16 11.5 x 15.5 178 43.3
  • 1 in = 25.4 mm
  • 1 in2 = 6.45x102 mm2
  • 1 in3 = 1.64x104 mm3
  • 1 in4 = 4.16x105 mm4
  • 1 lb/ft = 1.49 kg/m

Based on standard commercially available lumber within the USA.

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