Looking for bolt size

[upupandaway]

I came across a W1-450v Wisconsin motor. It is missing the shaft bolt. Does anyone know what bolt size\thread this motor takes as I went by feel but it eventually wiggled loose.

TIA.

 

[Bertrrr]

Look it up on Amazon , for replacement parts for that machine,

 

[StarTech]

Wisconsin W1-450V / Robin EY45V.

PTO should be threaded for a 7/16-20 grade 5 or 8 bolt. Should be torqued to at least 45 ft-lbs with a lock washer.