Machine Design
The dedendum circle diameter is equal to (where φ = Pressure angle)

Addendum circle diameter × cosφ
Pitch circle diameter × cosφ
Clearance circle diameter × cosφ
Pitch circle diameter × sinφ

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Machine Design
A tap bolt

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

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