Abstract: A device for preparing screw and washer assemblies, each comprising a screw and washer to be disposed around the threaded shank of the screw, and a method using such a device, are provided. The device comprises a first rack for screws and a second rack for washers. The first rack has first recesses to orient the screws in one direction and orientation and predetermined arrangement. These are a first series of grooves for receiving the threaded shank of the screws and a second series of grooves for receiving the screw heads. The second rack has second recesses to position the washers in the same predetermined arrangement. These may be a third series of grooves, on the bottom of which the washers can come to bear. The first rack is formed on a first face of a plate and the second rack is formed on a second face of the plate.