Feather keys are typically how they fit in relation to a shaft and hub?

• A. Tight in shaft and loose in hub
• B. Loose in shaft and tight in hub
• C. Tight in both shaft and hub
• D. Loose in both shaft and hub

Answer: (A)

Feather keys are designed to fit tightly in the shaft, ensuring that they can effectively transmit torque without slipping. The tight fit in the shaft provides a secure connection that minimizes movement during operation. On the other hand, when it comes to the hub, feather keys are intended to fit loosely. This design allows for ease of assembly and disassembly, enabling the hub to slide over the key while maintaining a secure connection with the shaft. This combination of tight and loose fits is essential for the correct functioning of mechanical assemblies that utilize feather keys, as it balances both transmission of force and ease of maintenance.