Machine Design
A feather key is generally

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

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Machine Design
In oilness bearings

The oil film is maintained by supplying oil under pressure
Grease required to be applied after some intervals
The oil film pressure is generated only by the rotation of the journal
Do not require external supply of lubricant

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