The slot where a key fits on the hub of a mating part is called the ________.

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Multiple Choice

The slot where a key fits on the hub of a mating part is called the ________.

Explanation:
The key fits into a groove that serves as a seating area for it, so the slot on the hub that receives the key is called a keyseat. This term emphasizes the space where the key sits, forming the positive drive that locks the hub to the shaft and transmits torque. (Some texts also call a similar groove on the hub a keyway, but in this context keyseat is the intended term.) The other options are not standard terms for this specific slot.

The key fits into a groove that serves as a seating area for it, so the slot on the hub that receives the key is called a keyseat. This term emphasizes the space where the key sits, forming the positive drive that locks the hub to the shaft and transmits torque. (Some texts also call a similar groove on the hub a keyway, but in this context keyseat is the intended term.) The other options are not standard terms for this specific slot.

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