Machine Design
The dedendum is the radial distance from the

Addendum circle to the clearance circle
Top of a tooth to the bottom of a tooth
Pitch circle to the bottom of a tooth
Pitch circle to the top of a tooth

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Machine Design
A stud

Has a head on one end and a nut fitted to the other
Has pointed threads
Has head at one end and other end fits into a tapped hole in the other part to be joined
Has both the ends threaded

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