Machine Design
When screw threads are to be used in a situation where power is being transmitted in one direction only, then the screw threads suitable for this will be

Buttress threads
Square threads
Acme threads
Knuckle threads

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Machine Design
When a belt drive is transmitting maximum power,

Driving tension on slack side is equal to centrifugal tension
Effective tension is equal to centrifugal tension
Driving tension on tight side is twice the centrifugal tension
Effective tension is half of centrifugal tension

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Machine Design
Jam nut is a locking device in which

A hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip
One smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
A slot is cut partly in middle of nut and then slot reduced by tightening a screw
Through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter spitted and bent in reverse direction at other end

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