Machine Design
Turn buckle has

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

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Machine Design
Tapered roller bearings can take

Both radial and axial loads and the ratio of these being less than unity
Axial load only
Radial load only
Both radial and axial loads and the ratio of these being greater than unity

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