Machine Design
Turn buckle has

Left hand threads on both ends
Right hand threads on bout ends
Left hand threads on one end and right hand threads on other end
No threads

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Machine Design
The contact ratio is the ratio of

Length of arc of contact to the circular pitch
Length of arc of recess to the circular pitch
Length of arc of approach to the circular pitch
Length of path of contact to the circular pitch

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Machine Design
Set screws are

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

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