Machine Design
A taper key which fits half in the key way of the hub and half in the key way of shaft, is known as

Mitre gears
Internal bevel gears
Crown Bevel gears
Angular bevel gears

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Machine Design
Set screws are

Similar to stud
Used to prevent relative motion between parts
Similar to small size tap bolts except that a greater variety of shapes of heads are available
Slotted for a screw driver and generally used with a nut

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