NHLA American Hardwood Lumber Grades

FAS F1F SELECT #1 COM #2A & 2B #3A COM #3B COM FAS LIMITS
Minimum Size Board 6" x 8' Same as FAS for species being graded 4" x 6' 3" x 4' 3" x 4' 3" x 4' 3" x 4' Pith = SM in inches

Wane = 1/2 Length

Knot = 1/3 SM

Warp = Entire board must be flat enough to S2S to S.S.T.

Splits = Not to exceed 2 x SM or 12", whichever is greater

Splits shall not diverge 1" in 12"

First Lineal Rule: Applies to both ends of board to contain not less than 50% clear wood, 25% sound wood.
Wane in FAS 1 FACE
FAS limitation applied to better face

#1 COM side: 1/3 W or 1/2 L widest wane added together; Length can be on both edges
Minimum Size Cutting 4" x 5'
3" x 7'
Better face to grade FAS

Poor face to grade #1 COM
4" x 2'
3" x 3'
3" x 2' 3" x 2' Not less than 1 - 1/2" wide containing 36 sq. inches Wane in Selects

Pcs. 6" & Wider
FAS limitation applies to better face.
#1 COM side: 1/3 W or 1/2 L
Widest wane added together.
Length can be on both edges.

Pcs. 4" & 5" Wide
1/3 W or 1/2 L applies to both faces.

Add widest wane together.

Add total length of wane from both edges.
Basic Yield SM x 10
83 - 1/3%
SM x 8
66 - 2/3%
SM x 6
50%
SM x 4
33 - 1/3%
SM x 3
25%
Formula to Determine Number of Cuts SM
4

(4 max)
SM + 1
3

(5 max)
SM
2

(7 max)
Unlimited Unlimited sound cuttings
SM Needed to Take Extra Cutting 6 - 15' SM 3 - 10' SM 2 - 7' SM
Extra Yield Needed for Extra Cutting SM x 11
91 - 2/3%
SM x 9
75%
SM x 8
66 - 2/3%
Special Yields 97% Rule - 2 cuts full widths any length; Pcs. 6" & wider with 6 - 12' SM
SM x 11.64 for yield
97% Rule - On better face 97% Rule - On better face 2' x 3' SM to be 100% clear or SM x 11 in one cutting 1' SM - SM x 12 or 100% clear 2' SM - SM x 9 1' SM - SM x 8

#2A COM - clear cuttings

#2B COM - sound cuttings
#2A COM on better face and reverse side of cuttings sound; will also qualify for #3A COM NOTE: This chart summarizes the main requirements for the standard grades. For complete information, consult the appropriate section of the NHLA Rule Book.

Washington - Seattle

20205 59th Place South | Kent, WA 98032
Phone: 800•426•0990 | Fax: 253•872•0747

Oregon - Portland

5737 NE Portland Hwy | Portland, OR 97218
Phone: 800•452•1692 | Fax: 503•281•2791

NHLA Member FSC Certified
© 2017 Johnson International Industries, Inc. All Rights Reserved.