Machine Design
For applications involving high stresses in one direction only the following type of thread would be best suited

Acme thread
ISO metric thread
Square thread
Buttress thread

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Machine Design
When the shaft rotates in anticlockwise direction at high speed in a bearing, it will

Have contact at the bottom most of the bearing
Move towards left of the bearing making metal to metal contact
Move towards right of the bearing making metal to metal contact
Move towards right of the bearing making no metal to metal contact

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