Machine Design
For a square key made of mild steel, the shear and crushing strength are related as

Shear strength is less than crushing strength
Shear strength is greater than crushing strength
None of these
Shear strength is equal to crushing strength

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Machine Design
Cap screws are

Used to prevent relative motion between parts
Provided with detachable caps
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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