S4S means this hardwood has been surfaced on all four sides. This board has a cleaner appearance than S2S1E.
Red Oak S4S hardwood is stocked in 3/4 thick boards in widths from 2 to 12. Clean dressed on all four sides with square edges. Lengths can vary and
Oak, Red Hardwood S4S | Capitol City Lumber
Description Shipping Information Hardwood Lumber Hard Maple 5 1/4 Width x 3/4 Depth x 60 Length Surfaced Four Sides leadtime: Usually ships from
Hard Maple Lumber - S4S - 1 x 6 x 60
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National Hardwood Magazine - November 2017
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Builders Choice 1 in. x 3 in. x 8 ft. S4S Maple Board HDSM10308X - The Home Depot
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2 Pack 3/4 x 4 x 12 S4S Curly Soft Maple lumber