Machine Design
The wire ropes make contact at

Anywhere in the groove of the pulley
Sides and bottom of groove of the pulley
Sides of groove of the pulley
Bottom of groove of the pulley

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Machine Design
Machine screws are

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
Used to prevent relative motion between two parts
Similar to stud

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