Abstract: A sealing nut is disclosed for sealed engagement with a workpiece. The sealing nut has a nut body having a lower face, and a bore extends through at least a portion of the nut body. A groove is formed in the lower face, the groove having a side wall which extends upwardly from the lower face. At least a lower portion of the side wall slants outward from a remotely disposed axis of the bore as the side wall extends upward from the lower face. A sealing element, such as an O-ring is disposed within the groove. The sealing element has an outer diameter greater than the diameter of the groove at the lower face of the nut body so that the sealing element must be compressed slightly to be fitted within the groove and so that the groove removably retains the sealing element in place without the need for a sealant or glue.

Abstract: A fastener is disclosed for sealed engagement with a workpiece. The fastener has a head having a lower face, and a shank extends from the lower surface of the head. A groove is formed in the lower surface, the groove having an inner wall and an outer wall. The inner wall has a proximal end which is adjacent the lower surface of the head and which is disposed radially remotely from the shank. A sealing element, such as an O-ring, is disposed at least partially within the groove. The groove may be configured so that a distal end of the inner wall is near to the axis of the shank than is the proximal end of the inner wall.

Abstract: A sealing fastener, such as a sealing rivet, is disclosed for sealing engagement with a workpiece. The sealing fastener has a head and a shank extending from a lower surface of the head. An aperture passes through the head and shank, and a mandrel and collar fit within the aperture. A sealing member, such as an O-ring is disposed between the collar and the mandrel. The head of the sealing fastener may also have a groove formed therein and may have a sealing member disposed at least in part in the groove. In use, the rivet is placed through an opening in the workpiece, and a lower portion of the shank is collapsed so to form a lower head and so that the upper and lower heads engage the workpiece. The sealing member is compressed between the collar and a wall of the aperture, and the collar and mandrel are placed in locking engagement to maintain the sealing member in a compressed state.