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Originally Posted by Cuog
While keyways are nice they have flaws such as loose keys and the key exploding since all the torque is applied at that one point
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"Exploding" keys are not always a flaw. Most of the time I would consider them a safety feature. If the key breaks it just saved some other part of your drive train like a shaft or some gear teeth. I would much rather replace a key in a wheel hub in the heat of competition than rebuild a gearbox. Sometimes it is not always about designing everything in your drive train to withstand unlimited torque than it is about designing a built in safety that is easy to fix. I would much rather have to replace a U joint on my 4 wheel drive truck than have to rebuild the transmission or rear end.