Machine Design
A flanged pipe joint will be a leak-proof joint, if the circumferential pitch of the bolts is (where d = Diameter of bolt hole)

Equal to inside diameter of pipe
Greater than 30d
Less than 20d
Between 20d and 30d

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Machine Design
A tap bolt

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

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