A student connects a shaft to a rotating machine-element hub using a tapered sunk key that prevents relative axial motion. Which key is most likely used?
A gib-head key is a tapered sunk key whose wedging fit restrains relative motion; its projecting head helps removal. A feather key permits axial sliding, a saddle key is not sunk into the shaft, and the Woodruff key is a semicircular key. **D**.
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