Sealed self-threading cap nut

Claim 1

A METAL FASTENING DEVICE FOR ROTATIVE APPLICATION WITH A THREADLESS STUD OR THE LIKE COMPRISING, A BASE HAVING A CENTRAL OPENING EXTENDING THERETBROUGH, A TUBULAR SHANK INTEGRALLY CONNECTED TO SAID BASE AND EXTENDING DOWNWARDLY THEREFROM, SAID SHANK HAVING AN ENDLESS SIDE WALL DEFINING AN AXIAL PASSAGEWAY DISPOSED CONCENTRIC RELATIVE TO THE OPENING IN SAID BASE AND ADAPTED TO RECEIVE A STUD WHEN INSERTED THROUGH THE OPENING IN SAID BASE, SAID SHANK BEING ENTIRELY CLOSED AT THE END REMOTE FROM SAID BASE FOR COMPLETELY ENCOMPASSING A STUD WHEN DISPOSED IN SAID PASSAGEWAY, A PLURALITY OF ANGULARLY DISPOSED THREAD-CUTTING PROJECTIONS SHEARED FROM THE MATERIAL OF SAID SIDE WALL AND EXTENDING INTERIORLY FROM SAID SIDE WALL INTO SAID PASSAGEWAY, SAID PROJECTIONS BEING DISPOSED ADJACENT SAID BASE FOR SELF-THREADCUTTING ENGAGEMENT WITH A STUD WHEN INSERTED THROUGH THE OPENING IN SAID BASE, A DEFORMABLE FLEXIBLE, SUBSTANTIALLY FLAT SEALING MEMBER ATTACHED TO THE UPPER SURFACE OF SAID BASE, AN ENDLESS RAISED EMBOSSED PORTION FORMED FROM THE MATERIAL OF AND PROJECTING UPWARDLY FROM SAID BASE, SAID EMBOSSED PORTION BEING SPACED RADIALLY OUTWARDLY RELATIVE TO THE OPENING IN SAID BASE AND ADAPTED TO PROVIDE A SUPPORT FOR SAID SEALING MEMBER, SAID SEALING MEMBER HAVING A GENERALLY CIRCULAR OPENING DISPOSED IN CONCENTRIC RELATION RELATIVE TO SAID EMBOSSED PORTION, AND THE OPENING IN SAID SEALING MEMBER HAVING A SUBSTANTIALLY SMALLER DIAMETER THAN THE MAXIMUM TRANSVERSE DIMENSION OF SAID STUD FOR TIGHT SEALING ENGAGEMENT THEREWITH WHEN INSERTED FOR SELF-THREADING ENGAGEMENT THROUGH THE PASSAGEWAY IN SAID SHANK, AND WHEREBY IN THE INSTALLED POSITION OF THE DEVICE WITH AN APERTURED SUPPORT MEMBER, SAID SEALING MEMBER PROVIDES THE SOLE SURFFACE ENGAGEMENT BETWEEN SAID BASE AND THE CONFRONTING SURFACE OF SAID SUPPORT MEMBER WHEN HELD TOGETHER BY SAID STUD.