We are a professional manufacturer of drive shafts and universal joints for farm
tractor in China. The shafts we make are six spline, Lemon and threaded hole. 

The sizes are 1# shafts, 2# shaft, 3# shaft, 4# shafts, 5# shaft, 6# shafts, 4# shafts
with slip clutches and 6# shafts with slip clutches: 
1) 1# shaft: 
    a) Length: 27" - 50" 
    b) Six spline ends: 1-3/8" 
    c) Up to 30HP tractors 
2) 4# shaft: 
    a) Length: 29" - 53" 
    b) Six spline ends: 1-3/8" 
    c) Up to 56HP tractors 
3) 6# shaft: 
    a) Length: 36" - 56" 
    b) Six spline ends 
    c) Up to 100HP tractors 
4) 6# shaft with slip clutch: 
    a) Length: 36" - 56" 
    b) Six spline, Lemon and keyway threaded hole 
    c) Up to 160HP tractors at 1,000rpm