Machine Design
Cap screws are

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

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Machine Design
A woodruff key is

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

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