Machine Design
A tapered key which fits in a key way in the hub and is flat on the shaft, is known as

Wood ruff key
Feather key
Flat saddle key
Gib-head key

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Machine Design
According to I.B.R., when the thickness of boiler shell (t) is greater than 8 mm, then the diameter of rivet hole (d) is obtained by

Equating shearing resistance to the crushing resistance of the rivets
None of these
Equating tearing resistance of the plate to the crushing resistance of the rivets
Equating tearing resistance of the plate to the shearing resistance of the rivets

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