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Originally Posted by Cory
It's so much easier than using keys--nothing to lose, and unlike keys, the hex won't slip.
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The key will stay in place if it is brazed to the shaft, which immobilizes it (adhesives might work). You can also cut a light groove around the shaft for a retaining clip or e-clip.
Most gears and sprockets with finished bores have a standard keyway cut into the instead of square or hex shafts, when purchased from sources such as McMasterCarr and Grainger. One reason why keys are so common.