What size are cat 3 pins?

Cat 3 pins, meaning Category 3 three-point hitch pins, are standardized large pins for large agricultural tractors 80 to 225 horsepower. Category 3 specifications per ASABE standard are lower link pins 1-7/16 inch diameter, which is 1.4375 inches, and top link pin 1-1/4 inch diameter, 1.25 inches, with spacing between lower arms about 38 inches. Lift capacity for Cat 3 is 5000 to 8000 pounds or more at link ends. These pins are much larger than Cat 1 which has 7/8 inch lower and 3/4 inch top, and Cat 2 which has 1-1/8 inch lower and 1 inch top. Cat 3 pins are made of high-strength steel to handle heavy draft loads from large plows, heavy discs, and big balers. When buying Cat 3 implements, pins are usually included, but replacement pins and bushings are available at farm supply stores. Some Cat 3 hitches have convertible Cat 2/3 with two holes allowing both sizes with bushings. For quick hitch, Cat 3 quick hitch uses these larger pins. If measuring existing pins, use calipers to confirm, as wear can make pins slightly smaller. Using undersized pins can cause implement to wobble and be unsafe, so match pin size to tractor category. Cat 4 pins are even larger at 2 inches for over 300 horsepower tractors. So Cat 3 pins are 1-7/16 lower and 1-1/4 top.