Three point hitches

Project: Three point hitches

Parts:	Frames, Nuts, Bolts, End caps
Techniques:	Tri joints

Approaches

Size categories

File:Cat I and II ball closeup.jpg

Adjustable three-point ball on lift arm. Ball may be rotated to fit either Category I or II implements

File:Heckhubwerk mit Fanghaken Cat3, Case IH Puma 225 CVX.jpg

Rear three-point hitch of a Case IH tractor with implement attached by the drawbar

There are five different hitch sizes, called categories. The higher category hitches have sturdier lift arms and larger connector pins.Template:R

Category	Tractor power	Top link pin diameter*	Lift arm pin diameter	Lower hitch spacing
0	Up to Template:Convert	Template:Convert	Template:Convert	Template:Convert
1	Template:Convert	Template:Convert	Template:Convert	Template:Convert
2	Template:Convert	Template:Convert	Template:Convert	Template:Convert
3	Template:Convert	Template:Convert	Template:Convert	Template:Convert
4	More than Template:Convert	Template:Convert	Template:Convert	Template:Convert

There are also variants to the above categories denoted by N, (narrow). These utilize the pin sizes of the listed category, but the width of a category one step lower. The N variations are common in "quick hitches" and allow larger tractors to easily hook onto smaller utility implements.

* refers to implement end; tractor end not specified

References

• Wikipedia: Three-point hitch