sprocket

Any of various toothlike projections arranged on a wheel rim to engage the links of a chain.

A cylinder with a toothed rim that engages in the perforations of photographic or movie film to pull it through a camera or projector.

One of a series of projections in a grooved recess round the lower part of a ship's capstan, by which the chain-cable is grasped while heaving up anchor.

One of the projections on a sprocket-wheel which engage the chain.

A tooth or projection, as on the periphery of a wheel, shaped so as to engage with a chain.