62 attachments in our database list a PTO requirement under 25 horsepower. They need 10 to 22 PTO horsepower, with a median of 18, and the 58 that list a weight run from 145 to 715 lb. The types are finish mowers (15), post hole diggers (13), rotary tillers (11), snow blowers (9), rotary cutters (7) and flail mowers (7).
Implements that need no PTO power at all, such as box blades and rear blades, are on the no-PTO page. They are limited by weight and lift capacity instead.
Size the implement to your tractor's PTO horsepower, not its engine horsepower. Across the database the median loss between the two is 18 percent.