Size Categories
There are five different hitch sizes, called categories. The higher category hitches have sturdier lift arms and larger connector pins. There is some flexibility in the tractor hp at which one category hitch ends and the next begins.
| Category | Tractor HP | Top Link Pin Diameter | Lift Arm Pin Diameter |
|---|---|---|---|
| 0 | Up to 20 | 5/8 in | 5/8 in |
| 1 | 20 to 45 | 3/4 in | 7/8 in |
| 2 | 40 to 100 | 1 in | 1⅛ in |
| 3 | 80 to 225 | 1¼ in | 1 7/16 in |
| 4 | 180 to 400 and up | 1 3/4 in | 2 in |
Read more about this topic: Three-point Hitch
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