Machine Design
A key made from a cylindrical disc having segmental cross-section, is known as

Woodruff key
Feather key
Flat saddle key
Gib head key

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Machine Design
A stud

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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