What is the 4th dimension 2

Lumber Dimensions

2x4s are not actually 2 inches by 4 inches. When the board is first rough sawn from the log, it is a true 2x4, but the drying process and planing of the board reduce it to the finished 1.5x3.5 size. Here are the common sizes of lumber, and their actual sizes.

NominalActualActual - Metric
1" x 2"3/4" x 1-1/2"19 x 38 mm
1" x 3"3/4" x 2-1/2"19 x 64 mm
1" x 4"3/4" x 3-1/2"19 x 89 mm
1" x 5"3/4" x 4-1/2"19 x 114 mm
1" x 6"3/4" x 5-1/2"19 x 140 mm
1" x 7"3/4" x 6-1/4"19 x 159 mm
1" x 8"3/4" x 7-1/4"19 x 184 mm
1" x 10"3/4" x 9-1/4"19 x 235 mm
1" x 12"3/4" x 11-1/4"19 x 286 mm
1-1/4" x 4"1" x 3-1/2"25 x 89 mm
1-1/4" x 6"1" x 5-1/2"25 x 140 mm
1-1/4" x 8"1" x 7-1/4"25 x 184 mm
1-1/4" x 10"1" x 9-1/4"25 x 235 mm
1-1/4" x 12"1" x 11-1/4"25 x 286 mm
1-1/2" x 4"1-1/4" x 3-1/2"32 x 89 mm
1-1/2" x 6"1-1/4" x 5-1/2"32 x 140 mm
1-1/2" x 8"1-1/4" x 7-1/4"32 x 184 mm
1-1/2" x 10"1-1/4" x 9-1/4"32 x 235 mm
1-1/2" x 12"1-1/4" x 11-1/4"32 x 286 mm
2" x 2"1-1/2" x 1-1/2"38 x 38 mm
2" x 4"1-1/2" x 3-1/2"38 x 89 mm
2" x 6"1-1/2" x 5-1/2"38 x 140 mm
2" x 8"1-1/2" x 7-1/4"38 x 184 mm
2" x 10"1-1/2" x 9-1/4"38 x 235 mm
2" x 12"1-1/2" x 11-1/4"38 x 286 mm
3" x 6"2-1/2" x 5-1/2"64 x 140 mm
4" x 4"3-1/2" x 3-1/2"89 x 89 mm
4" x 6"3-1/2" x 5-1/2"89 x 140 mm


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