These terms denote several types of small wedgelike metal objects designed to fit mating slots in a shaft and the hub of a gear or pulley to prevent slippage and provide a positive drive between them. Parts can be keyed together by means of a flat piece of steel that is partly seated in a recessed shaft or groove called a keyseat. Figure 7.6 shows three types of keys, a keyseat, and a keyway. A keyseat is a slot or groove on the outside of a part into which the key fits. A keyway is a slot or groove within a cylinder, tube, or pipe. A key fitted into a keyseat will slide into the keyway and prevent movement of the parts. Drawings usually include a height dimension that states the measurement from the circumference to the depth to which the keyway and keyseat are machined.
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