Editing Three-point hitch (section)

==Size categories==
[[File:Cat I and II ball closeup.jpg|thumb|Adjustable three-point ball on lift arm. Ball may be rotated to fit either Category I or Category II implements]]
[[File:Heckhubwerk mit Fanghaken Cat3, Case IH Puma 225 CVX.jpg|thumb|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.{{r|TractorData}}

{| class="wikitable" border="1"
|-
! style="text-align: left; padding-left: 1em; padding-right: 1em;" | Category
! style="text-align: left; padding-left: 1em; padding-right: 3em;" | Tractor power
! style="text-align: left; padding-left: 1em; padding-right: 3em;" | Top link pin diameter{{Efn|Refers to implement end; tractor end not specified.}}
! style="text-align: left; padding-left: 1em; padding-right: 3em;" | Lift arm pin diameter
! style="text-align: left; padding-left: 1em; padding-right: 3em;" | Lower hitch spacing
|-
| style="text-align: center;" | 0
| style="padding-left: 1em;" | Up to {{convert|20.|hp|abbr=on}}
| style="padding-left: 1em;" | {{convert|5/8|in|abbr=on}}
| style="padding-left: 1em;" | {{convert|5/8|in|abbr=on}}
| style="padding-left: 1em;" | {{convert|20|in|-1|abbr=on}}
|-
| style="text-align: center;" | 1
| style="padding-left: 1em;" | {{convert|20|to|45|hp|abbr=on}}
| style="padding-left: 1em;" | {{convert|3/4|in|abbr=on}}
| style="padding-left: 1em;" | {{convert|7/8|in|abbr=on}}
| style="padding-left: 1em;" | {{convert|28|in|-1|abbr=on}}
|-
| style="text-align: center;" | 2
| style="padding-left: 1em;" | {{convert|40.|to|100.|hp|abbr=on}}
| style="padding-left: 1em;" | {{convert|1|in|abbr=on}}
| style="padding-left: 1em;" | {{convert|1+1/8|in|abbr=on}}
| style="padding-left: 1em;" | {{convert|34|in|-1|abbr=on}}
|-
| style="text-align: center;" | 3
| style="padding-left: 1em;" | {{convert|80.|to|225|hp|abbr=on}}
| style="padding-left: 1em;" | {{convert|1+1/4|in|abbr=on}}
| style="padding-left: 1em;" | {{convert|1+7/16|in|abbr=on}}
| style="padding-left: 1em;" | {{convert|40|in|-1|abbr=on}}
|-
| style="text-align: center;" | 4
| style="padding-left: 1em;" | More than {{convert|180.|hp|abbr=on}}
| style="padding-left: 1em;" | {{convert|1+3/4|in|abbr=on}}
| style="padding-left: 1em;" | {{convert|2|in|abbr=on}}
| style="padding-left: 1em;" | {{convert|48|in|-1|abbr=on}}
|}

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.