M4-R Shafts Are Used For Rotary Mowers
M4-R-31  PTO shaft for 4' mowers.  Tractor end 1 3/8" six spline.  Mower end 1 3/8" round bore (see below).  Hole for 1/2" pin.   Circlip on axle to retain the PTO shaft.  Length closed:  31 1/2"   Weight: 24 lbs. M4-R-37  PTO shaft for 5' mowers.  Tractor end 1 3/8" six spline.  Mower end 1 3/8" round bore (see below) .  Hole for 1/2" pin.  Circlip on axle to retain PTO shaft. Weight: 27 lbs. M4-R-46 PTO shaft for 6' mowers. Tractor end has 1 3/8"   six spline. Mower end 1 3/8" round bore (see below). Hole for 1/2" pin. Circlip on axle to retain PTO shaft. Weight  30 lb. 
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Cross cut of round bore
Axel Shaft
Six spline 1 3/8"