... we make are six spline, Lemon and threaded hole. The sizes are 1# shafts, 2# shaft, 3# shaft, 4# shafts, 5 ... we make are six spline, Lemon and threaded hole. The sizes are 1# shafts, 2# shaft, 3# shaft, 4# shafts, 5 ... threaded hole c) Up to 160HP tractors at 1,000rpm High Quality Agriculture Drive Shafts