Machine Design
A connecting rod subjected to an axial load may buckle with

X-axis or Y-axis as neutral axis
Z-axis
Y-axis as neutral axis
X-axis as neutral axis

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Machine Design
Machine screws are

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

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