Oregon 45-111 Ball Joint Lawn Mower Replacement Part Oregon 45-111 Replacement Ball Joint Size: 3/8-24 male and female threads. Thread length: 5/8" For Riders. Rubber grommet seal 1996 and newer. Used on tractor series 200, 400, 500, 600, 700, 800, 900 Replaces MTD 923-3018, 723-3018