Machine Design And Shop Practice (MDSP) Inhouse Practice Exam

Which type of key is Kennedy key another name for?

Saddle key Roll pin Tangential key Woodruff key

Correct Answer:

Tangential key

Explanation:

Torque is transferred from a shaft to a hub by a key that sits in matching slots on both parts. The Kennedy key is another name for a tangential key, which engages in a keyway so that the contact and drive occur along a line tangent to the shaft’s circumference. This tangential engagement provides a straightforward, compact way to transmit torque and is a distinct style from other key forms. For example, Woodruff keys use a semicircular shape and a matching semicircular slot, saddle keys sit in a saddle-shaped groove, and a roll pin is a separate type of fastener, not a key. So, the Kennedy key is the same as the tangential key.

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