Quote:
Originally Posted by LubeMaster77
Another text book example of a type of failure - fatigue.
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LOL, I have three pieces just like that on top of my file cabinets in my office.
With just looking at the picture I don't see a stress riser or significant material flaw other than the keyway.
My guess is it endured too much radial load from misalignment causing it to bend at ever revolution which work hardened it until it became too brittle and sheared. Have you run any hardness tests on it yet?