Machine Design
A feather key is generally

Tight in both shaft and hub
Tight in shaft and loose in hub
Loose in shaft and tight in hub
Loose in both shaft and hub

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Machine Design
A tap bolt

Has pointed threads
Has head at one end and other end fits into a tapped hole in the other part to be joined
Has both the ends threaded
Has a head on one end and a nut fitted to the other

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