A sprocket from Grainger is a toothed wheel designed to catch on chains and tracks. Choose exactly the size, style and type of sprocket you need to allow machine movement. A basic steel sprocket includes a standard keyway and two setscrews for use with a standard roller chain. An idler sprocket is hardened for tougher surfaces and used to maintain tension for chains. And when internal sprockets and other components require attention, an inspection or access door can help you reach your equipment. Rely on Grainger to supply whatever sprocket you need.