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**Need help calculating Shear on a 5/8" square key**

PF,

I am trying to figure out how to calculate the shear on a 5/8" x 5/8" x 3-1/2"L standard shaft key, when the OD of the shaft it fits into is 3". A tire of ~40" dia rides on the shaft and at any given time, let's say a load of 20,000lbs is applied to put a bending moment on the shaft at the surface of the tire. If I assume the shaft is fixed for brief moment in time,

what is the maximum shear I can apply to the key before it gives (breaks)?