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 20hp	5/8 in	5/8 in	20 in
1	20 to 45hp	3/4 in	7/8 in	28 in
2	40 to 100hp	1 in	1+1/8 in	34 in
3	80 to 225hp	1+1/4 in	1+7/16 in	40 in
4	More than 180hp	1+3/4 in	2 in	48 in

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