Machine Design
In a turnbuckle, if one of the rods has left hand threads, then the other rod will have

Left hand threads
Multiple threads
Pointed threads
Right hand threads

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Machine Design
In oilness bearings

Do not require external supply of lubricant
The oil film is maintained by supplying oil under pressure
The oil film pressure is generated only by the rotation of the journal
Grease required to be applied after some intervals

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