Replacement gearbox nut fits several different Bush Hog models, 1-1/4"-12 Thread Pitch Right Hand Grade 8 Jam Nut We sell many replacement parts for the most manufacturers rotary cutters. If you don't see the parts you need listed please contact us we would love to earn your business. We are listing new items frequently so please check our store often. Part Numbers:1.25-12JN We stock a wide variety of replacement parts for Agricultural Equipment please contact us if you have any questions or if you would like more information.