Dog (mechanics)
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In mechanical engineering, a dog is a protrusion on a shaft or other component for the purposes of correct orientation and for transmitting torque. For example, a dog clutch is a means to couple two rotating shafts and is widely used in automotive transmissions.
Some threaded engineering components have cutouts and are fitted with a wrench carrying matching dogs. An example would be the lockring on a fixed wheel sprocket for a bicycle.
