We are a professional manufacturer of PTO drive shafts and universal joints for farm tractor in China. The yoke we make are six spline, Lemon and threaded hole. triangle and so on ( we can make the products as your request ) The sizes are 1 #,2# ,3#4 5# and 6# shafts and 6 shafts with slip clutches: 1) 1 shaft: a) length: 27" - 50"(also can as your request) b) Six spline ends: 1-3/8",13/4" c) Up to 16HP tractors( alternating load) 2)2# shaft a) length: 27" - 50"(also can as your request) b) Six spline ends: 1-3/8",13/4" c) Up to 21HP tractors ( alternating load) 3)3# shaft a) length: 27" - 50"(also can as your request) b) Six spline ends: 1-3/8",13/4" c) Up to 30HP tractors ( alternating load) 4) 4 shaft: a) Length: 29" - 53"(also can as your request) b) Six spline ends: 1-3/8" c) Up to 35HP tractors( alternating load) 5) 5 shaft: a) Length: 36" - 56"(also can as your request) b) Six spline ends c) Up to 47HP tractors( alternating load) 6) 6shaft: a) Length: 36" - 56"(also can as your request) b) Six spline ends c) Up to 64HP tractors( alternating load) 7) 6 shaft with slip clutch: a) Length: 36" - 56"(also can as your request) b) Six spline, lemon and keyway threaded hole c) Up to 160HP tractors at 1,000rpm ( alternating load)