Machine Design
The rated life of a bearing varies

Inversely as cube of load
Inversely as square of load
Directly as load
Inversely as fourth power of load

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Machine Design
Cap screws are

Used to prevent relative motion between parts
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

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