Machine Design
Slenderness ratio is the ratio of

Maximum size of column to minimum size of column
Width of column to depth of column
Effective length of column to width of column
Effective length of column to least radius of gyration of the column

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Machine Design
Machine screws are

Used to prevent relative motion between two parts
Similar to stud
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

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