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.
Need to confirm your tractor's category before ordering? Use our tractor linkage pin-size measuring guide to check Cat 1, Cat 2 or Cat 3 dimensions.
Shop Linkage Pins and Top Links
Once you know your tractor's linkage category, choose the matching pins and top links below. All four options are currently in stock and dispatched as courier items.
- Category 1 top link pin — 19mm × 89mm
- Category 1 lower link pin — 22mm × 110mm
- Category 2 top link pin — 25mm × 112mm
- Category 2 lower link pin — 28mm × 110mm
Linkage categories and pin sizes at a glance. Horsepower ranges overlap between categories, so match the pin diameter, not the HP:
| Category | Typical tractor | Top link pin | Lower link pin |
|---|---|---|---|
| Cat 0 | Ride-on mowers and sub-compact | 16mm (5/8") | 16mm (5/8") |
| Cat 1 | Sub-compact and compact, 16–50 HP | 19mm (3/4") | 22mm (7/8") |
| Cat 2 | 45–120 HP | 25mm (1") | 28mm (1-1/8") |
| Cat 3 | 100–225 HP | 32mm (1-1/4") | 38mm (1-7/16") |
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.