What type of key is suitable for applications where two joined parts may need to be frequently disassembled?

• A. Double-Nose Sunk Key
• B. Nose Key
• C. Square Ended Taper Key
• D. Boat Key

Answer: (A)

The double-nose sunk key is especially suitable for applications that require frequent disassembly of joined parts due to its specific design. This type of key allows for easy removal and insertion, which is crucial when components need to be taken apart regularly. The design enables it to fit snugly into the shaft and hub, providing a secure connection while also allowing for straightforward disengagement when needed.

Moreover, its distinctive shape helps to distribute loads evenly, thus minimizing damage to both the key and the coupling parts during operation. This feature becomes critical in applications like machinery or assembly lines where parts may need to be replaced or serviced often.

In contrast, other key types may not provide the same level of ease for disassembly, as they might require more effort to remove or could risk damage to the components upon disassembly. Hence, the double-nose sunk key is the most appropriate option in situations that demand frequent assembly and disassembly.