What's the difference between category 1 and category 2 3 point hitch?

The difference between Category 1 and Category 2 three-point hitch is primarily size, pin diameter, spacing, and tractor horsepower range they are designed for. Category 1 is for compact and small utility tractors around 20 to 50 horsepower, it uses 7/8 inch diameter lower link pins and 3/4 inch top link pin, lower link spacing about 26 to 27 inches, and typical lift capacity up to about 2,500 pounds. Category 2 is for larger utility and row-crop tractors around 50 to 90 horsepower, it uses larger 1 1/8 inch lower link pins and 1 inch top link pin, spacing about 32 to 33 inches, and lift capacity up to about 5,000 pounds. Category 2 arms are thicker and stronger to handle heavier draft loads. Implements are built for one category, though bushings can adapt Category 1 implements to Category 2 tractors. Quick hitches are category specific. Choosing the correct category ensures pins fit securely, geometry is correct for draft control, and you do not overload hitch components, so you should match hitch category to tractor and implement specifications.