Patent ID: 8596942

Claim:
A screw comprising: a sealing washer assembly; a shank defining a screw axis and having a thread in at least a portion thereof and having a first end; and a head at the first end and having an underside facing the shank; the sealing washer assembly being disposed on the shank and including at least one sealing washer and a reinforcing washer, the reinforcing washer having a thickness, and the sealing washer assembly having a cumulative thickness, the sealing washer assembly being spaced, along the screw axis, at a distance from the underside, the distance being greater than the thickness of the reinforcing washer and smaller than the cumulative thickness of the sealing washer assembly; wherein the first end of the shank is provided with a cylindrical collar whose end facing away from the head has the reinforcing washer fitted thereon, the collar having a length along the screw axis corresponding to the distance plus the thickness of the reinforcing washer; wherein in the region of the collar, the shank has a first diameter which is greater than a second diameter of the shank in the region of the thread.