Class Table

Dimensions of Coastal Douglas Fir and Southern Pine Poles

Class H-6 H-5 H-4 H-3 H-2 H-1 1 2 3 4 5 6 7

Minimum Circumference at Top (Inches)

    39 37 35 33 31 29 27 25 23 21 19 17 15
Length
(Feet)
Groundline*
Distance from
Butt (Feet)
Minimum Circumference at 6 Feet From Butt (Inches)
20 4.0             31.0 29.0 27.0 25.0 23.0 21.0 19.5
25 5.0             33.5 31.5 29.5 27.5 25.5 23.0 21.5
30 5.5             36.5 34.0 32.0 29.5 27.5 25.0 23.5
35 6.0         43.5 41.5 39.0 36.5 34.0 31.5 29.0 27.0 25.0
40 6.0     51.0 48.5 46.0 43.5 41.0 38.5 36.0 33.5 31.0 28.5  
45 6.5 58.5 56.0 53.5 51.0 48.5 45.5 43.0 40.5 37.5 35.0 32.5 30.0  
50 7.0 61.0 58.5 55.5 53.0 50.5 47.5 45.0 42.0 39.0 36.5 34.0    
55 7.5 63.5 60.5 58.0 55.0 52.0 49.5 46.5 43.5 40.5 38.0      
60 8.0 65.5 62.5 59.5 57.0 54.0 51.0 48.0 45.0 42.0 39.0      
65 8.5 67.5 64.5 61.5 58.5 55.5 52.5 49.5 46.5 43.5 40.5      
70 9.0 69.0 66.5 63.5 60.5 57.0 54.0 51.0 48.0 45.0 41.5      
75 9.5 71.0 68.0 65.0 62.0 59.0 55.5 52.5 49.0 46.0        
80 10.0 72.5 69.5 66.5 63.5 60.0 57.0 54.0 50.5 47.0        
85 10.5 74.5 71.5 68.0 65.0 61.5 58.5 55.0 51.5 48.0        
90 11.0 76.0 73.0 69.5 66.5 63.0 59.5 56.0 53.0 49.0        
95 11.0 77.5 74.5 71.0 67.5 64.5 61.0 57.0 54.0          
100 11.0 79.0 76.0 72.5 69.0 65.5 62.0 58.5 55.0          
105 12.0 80.5 77.0 74.0 70.5 67.0 63.0 59.5 56.0          
110 12.0 82.0 78.5 75.0 71.5 68.0 64.5 60.5 57.0          
115 12.0 83.5 80.0 76.5 72.5 69.0 65.5 61.5 58.0          
120 12.0 85.0 81.0 77.5 74.0 70.0 66.5 62.5 59.0          
125 12.0 86.0 82.5 78.5 75.0 71.0 67.5 63.5 59.5          
AMERICAN NATIONAL STANDARD 05.1-1987
*The figures in this column are intended for use only when a definition of groundline is necessary in order to apply requirements relating to scars, straightness, etc.
NOTE: Classes and lengths for which circumferences at 6 feet from the butt are listed in boldface type are the preferred standard sizes. Those shown in light type are included for engineering purposes only.