| 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) |
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| 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. | ||||||||||||||