Machine Design
When the shaft rotates in anticlockwise direction at slow speed in a bearing, it will

Move towards right of the bearing making no metal to metal contact
Move towards right of the bearing making the metal to metal contact
Have contact at the bottom most of the bearing
Move towards left of the bearing making metal to metal contact

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Machine Design
Machine screws are

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

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