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The term two by four (2x4) refers to the rough cut dimensions of construction grade lumber. However, the typical 2x4 purchased at a lumber yard is actually 13/4" x 31/2". Nonetheless, the term 2x4 persists. 
The term two by four (2x4) refers to the rough cut dimensions of construction grade lumber. However, the typical 2x4 purchased at a lumber yard is actually 13/4" x 31/2". Nonetheless, the term 2x4 persists.