Sprockets are toothed wheels that engage with the links of a chain to transmit rotational motion and torque, appearing throughout feed mill equipment wherever chain drives are used — most commonly in drag chain conveyors, where sprockets drive the conveyor chain around its loop, and in some bucket elevator designs using chain rather than belt to carry the buckets.

Sprocket tooth profile must precisely match the chain pitch (the spacing between chain links) it engages with, since a mismatched sprocket and chain combination will not mesh correctly, leading to rapid wear, noise, or in severe cases chain jumping or disengaging from the sprocket entirely during operation.

Sprockets are subject to wear at the tooth surfaces from constant engagement with the chain, with wear patterns typically most pronounced at the leading edge of each tooth where initial chain contact occurs during each engagement cycle — visibly worn, hooked or rounded sprocket teeth are a clear indicator that sprocket replacement is needed, since continuing to run a badly worn sprocket accelerates wear on the mating chain as well.

Drive and idler (non-powered) sprockets within the same chain loop should generally be replaced together when wear becomes significant, since a new sprocket paired with worn sprockets elsewhere in the same chain loop can create uneven chain tension and accelerated wear concentrated at the mismatched component, similar in principle to the reasoning behind replacing V-belts in matched sets.

Sprocket and chain lubrication is an important maintenance factor affecting both component wear rate and overall drive system efficiency, with lubrication type and frequency typically specified by the equipment manufacturer based on the specific chain and sprocket combination and the operating environment (dusty, wet, or otherwise) the equipment operates within.

In feed mill applications where chain and sprocket drives operate in dusty environments, lubricant selection sometimes favors drier or more specialized lubricants specifically chosen to minimize dust adhesion compared to standard heavy grease, since excessive dust buildup on a heavily lubricated chain and sprocket assembly can itself become an operational and housekeeping issue over time.