This friction disc is a wear component located in the header driveline of a grain harvester. It transmits torque through a clutch pack that protects the header’s driven components from shock loads. When the friction material on the disc surface wears below the specified thickness, the clutch slips under normal load, causing intermittent drive to the header auger or reel. Replacing the disc restores the clamping force required for full torque transfer. On reassembly, ensure the mating surfaces are clean and free of oil, and tighten the retaining hardware to the manufacturer’s torque specification.