Which type of key would be least likely to provide a strong grip under high torque applications?

• A. Woodruff Key
• B. Round Ended Taper Key
• C. Square Ended Taper Key
• D. Boat Key

Answer: (D)

The correct answer is the type of key that would least likely provide a strong grip under high torque applications.

Boat keys are typically designed for use in situations where the demand for strength is lower, such as in less demanding machinery or applications. They are usually simpler in design and do not have the advantageous taper that helps with grip and connection that other types of keys might possess. In high torque applications, a strong grip is essential to prevent slippage or failure, and boat keys may not be able to withstand the forces exerted in such situations due to their shape and design.

On the other hand, other types of keys like Woodruff keys, round-ended taper keys, and square-ended taper keys feature designs that improve their engagement with the shaft and hub, offering better resistance to slippage and a stronger grip under high torque. The tapered designs, in particular, help in wedging the key more securely into the keyway, providing greater resistance to rotational forces.