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Originally Posted by Cory
unlike keys, the hex won't slip.
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Nor will it weaken the shaft.
The keyway in a shaft is a stress concentrator, which significantly reduces the strength of the shaft, especially its resistance to breaking under shock loads. Keyways are popular 'cause they're easy, and using a 5/8" shaft where a 3/8" will do isn't an issue
if weight is not a consideration.
Einstein says the limit is ~286000 miles per second
Dean says the limit is 120 lbs.
Don