Machine Design
If threads on a bolt are left hand, threads on nut will be

Right hand with same pitch
Right hand with fine pitch
Left hand with same pitch
Could be left or right hand

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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 least radius of gyration of the column
Effective length of column to width of column

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