M4 shafts are used on medium tractor winches, small wood chippers, small rototillers and some hay rakes.  Transmittable horse power at 540 rpm is 35hp, at 1000 rpm 55hp. M4-31 Min length 31". Max length. 41".  Six spline 1 3/8" ends.  20 lb. M4-60 PTO shaft with min. length 60", six spline 1 3/8" ends.  32 lb. Price 220.00 Click HERE if you need this size shaft with a clutch.
Replacement Shafts
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Axel Shaft
Six spline 1 3/8"