To many casual users, tractor 3 point linkage pin sizes are a mystery. The three-point hitch is a method of attaching implements (equipment) to tractors.
Below, I have listed what sizes of pins are used on different sizes of tractors this is not entirely accurate as some tractors may go into a higher or lower HP range for the size of linkage :
Category 0 Usually found on large ride on mowers that cross over to the subcompact tractor size.
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16mm - 5/8" Diameter pin both top and bottom.
Category 1 Usually found on sub compact and compact tractors from 16 - 50HP
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19mm - 3/4" Top Link,
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22mm - 7/8" Lower linkage
Category 2 Usually found on tractors 45 - 120HP
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25mm - 1" Top link
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28mm -1-1/8" Lower linkage
Category 3 Usually found on tractors 100HP-225HP
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32mm - 1-1/4" Top Link
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38mm- 1-7/16" Lower Linkage
Linkage pins are usually secured in place with a
Linch pin
Or an R clip
Find the Right Linkage Parts for Your Tractor
Once you know your category, here are the matching pins, top links and securing hardware — all in stock and dispatched as courier items.
Category 1 (16–50HP)
- Top Link Pin — 19mm × 89mm ($8)
- Top Link Pin — 19mm × 100mm ($8)
- Lower Link Pin — 22mm × 110mm ($9)
- Top Link — adjustable 410–595mm ($50)
- Top Link — adjustable 520–710mm ($46)
- Hydraulic Top Link — 470–680mm ($630)
- Hydraulic Top Link — 540–820mm ($640)
Category 2 (45–120HP)
- Top Link Pin — 25mm × 112mm ($10)
- Lower Link Pin — 28mm × 110mm ($10)
- Lower Link Pin — 28mm × 130mm ($12)
- Top Link — adjustable 650–900mm ($45)
Securing Hardware
Mixing Cat 1 & Cat 2? Conversion Bushes
Running a Category 1 implement on a Category 2 tractor (or vice versa)? These sleeves adapt the pin sizes so the two categories fit together.
- Top Link & Pin Conversion Bush Kit — Cat 1 to 2 ($10)
- Lower Link Conversion Bushes — Cat 1 to 2 (pair) ($6.50)
Ready to Upgrade?
Shop our heavy-duty Cat 1 and Cat 2 Linkage Pins and Hydraulic Top Links today.
Related guides
Hitching a PTO-driven implement? Once the linkage is sorted, the drive shaft needs to match too. See our guide to PTO shaft spline sizes and how to fit or shorten a PTO shaft for the 6, 20 and 21 spline dimensions and the 540 / 1000 rpm differences.