Machine Design
A tap bolt

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
Has both the ends threaded
Has pointed threads

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Machine Design
A hollow saddle key is

A taper key which fits half in the key way of hub and half in the key way of shaft
Provided in pairs at right angles and each key is to withstand torsion in one direction only
A taper key which fits in a key way of the hub and is flat on the shaft
A taper key which fits in a key way of the hub and the bottom of the key is shaped to fit the curved surface of the shaft

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