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Hardwood Lumber - Dimensions

Sizing of hardwood lumber.

Dimensional lumber made from hardwood varies from the sizes used for softwood. Hardwood lumber dimensional sizes are indicated below:

Hardwood Lumber - Dimensions
Rough SizeNominal SizeActual Dimension (in)
(Inches)(Fraction In)
("quarter")		S1S1)S2S2)
3/8 3/16 (4.8 mm)
1/2   3/8 (9.5 mm) 5/16 (7.9 mm)
5/8   1/2 (13 mm) 7/16 (11 mm)
3/4   5/8 (16 mm) 9/16 (14 mm)
1 4/4 7/8 (22 mm) 13/16 (21 mm)
1 1/4 5/4 1 1/8 (29 mm) 1 1/16 (27 mm)
1 1/2 6/4 1 3/8 (35 mm) 1 5/16 (33 mm)
1 3/4 1 1/2 (38 mm)
2 8/4 1 13/16 (46 mm) 1 3/4 (44 mm)
3 12/4 2 13/16 (71 mm) 2 3/4 (70 mm)
3 1/2 3 1/4 (83 mm)
4 16/4 3 13/16 (97 mm) 3 3/4 (95 mm)
  • 1 inch = 25.4 mm

1) S1S - Surfaced one Side

2) S2S - Surfaced two Sides

Common Hardwood Species

  • Oak
  • Walnut
  • Basswood
  • Beech
  • Birch
  • Butternut
  • Chestnut
  • Cherry
  • Elm
  • Gum
  • Hickory
  • Maple
  • Mahogany
  • Yellow Poplar

Hardwood Grades

  • FAS - First and Second
    • best grade - required for a natural or stained finish
    • at least 6 inches wide and 8 to 16 feet long
    • 83.3% clear wood on the worst face
  • Select - No. 1 Common
    • minimum 3 inches wide and 4 - 16 feet long
    • 66.6% clear wood on the worst face
  • Select - No. 2 Common
  • Select - No. 3 Common

Related Topics

  • Miscellaneous

    Engineering related topics like Beaufort Wind Scale, CE-marking, drawing standards and more.

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