Machine Design
A bolt

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

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Machine Design
A woodruff key is

All of these
A tapered key with head at one end
Capable of tilting in a recess milled out in the shaft
Fitted in pairs at right angles

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Machine Design
In hydrostatic bearings

Grease is used for lubrication
Do not require external supply of lubricant
The Oil film pressure is generated only by the rotation of the journal
The oil film is maintained by supplying oil under pressure

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