Machine Design
A connecting rod should be

Strong in buckling about Y-axis
Strong in buckling about X-axis
Any one of the above
Equally strong in buckling about X-axis and Y-axis

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Machine Design
Cap screws are

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
Provided with detachable caps
Used to prevent relative motion between parts

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