This chain is a roller chain used in the gathering system of a corn header. It drives the gathering chains and snapping rolls that pull the stalk through the header and separate the ear. A worn or stretched chain causes inconsistent stalk feeding, leading to missed ears or plugging at the header throat. The chain is constructed to the S55R1 specification, matching the original pitch and roller geometry so it seats correctly on the header sprockets without requiring a change in tensioner position. On installation, verify that the master link clip is oriented with its closed end facing the direction of travel.