What type of key is primarily round and used to key shafts in applications where precise alignment is important?

• A. Gib-Head Taper Key
• B. Woodruff Key
• C. Square Ended Taper Key
• D. Nose Key

Answer: (B)

The Woodruff Key is primarily round and designed to fit into circular keyways, which makes it particularly effective in applications where precise alignment is crucial. This key type has a semicircular cross-section and allows for easy engagement with the keyway, providing a snug fit that minimizes lateral movement. When a shaft is rotated, the shape of the Woodruff Key helps maintain consistent positioning between the key and the keyway, ensuring that torque is effectively transmitted between components.

In contrast, the other key types have different designs and uses that may not provide the same level of alignment or are suited for different applications. This distinctive shape and functionality of the Woodruff Key make it the preferred choice in situations where accurate alignment is of utmost importance.