FM3-4104-000 MF4018 Copyboard Cover Hinge compatible with models MF4010, MF4012, MF4120, MF4122, MF4140, MF4150, 4018, 4010, 4012, 4120, 4122, 4140.This hinge is designed to support the copyboard cover mechanism on specified devices.It proper alignment and of the cover for consistent functionality.