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Question: A fin-diameter AISI 1045 steel shaft transmits 10 hp at 500 rpm to a pulley which is keyed to the shaft by an AISI 1045 steel flat key A in wide by in thick and 4 in long. What are the safety factors of the key based on the allowable stresses of 8000 psi in shear and 16 000 psi in bearing?

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