To many casual users, tractor 3 point linkage pin sizes are a mystery.T he three-point hitch is a standardized method of attaching implements (equipment) to tractors.

Below, I have  listed what sizes of pins are used on different sizes of tractor:

Category 0 Usually found on subcompact  tractors/ ride on mowers

• 16mm - 5/8" Diameter pin both top and bottom.   

Category 1   Usually found on tractors  from 16 - 45HP

• 19mm - 3/4"  Top Link,  

• 22mm - 7/8"  Lower linkage 

Category 2  Usually found on  tractors 45 - 120HP

• 25mm - 1"  Top link   

• 28mm -1-1/8" Lower linkage 

Category 3  Usually found on tractors 100HP-225HP 

• 32mm - 1-1/4" Top Link 

• 38mm- 1-7/16"  Lower Linkage