Synthetic resin fasteners

Claim 1

A NUT FOR USE WITH A STUD HAVING A PREDETERMINED MAJOR DIAMETER, SAID NUT COMPRISING A BODY OF PLASTIC MATERIAL, A DOME ON ONE END OF SAID BODY COVERING AN INTERIOR BORE EXTENDING LONGITUDINALLY AND CENTRALLY THROUGH THE INTERIOR OF SAID BODY TO AN OPEN END AT THE OPPOSITE END OF THE BODY, A RADIALLY ENLARGED, CENTRAL PORTION ON SAID BODY INTEGRALLY CONNECTED TO SAID DOME AND EXTENDING TOWARD THE OPPOSITE END OF THE BODY AND HAVING A PLURALITY OF FLATS ON ITS EXTERIOR SURFACE FOR ENGAGEMENT WITH A TOOL, A BASE EXTENDING RADIALLY OUTWARDLY FROM SAID CENTRAL PORTION OF SAID BODY HAVING THE FLATS AND EXTENDING LONGITUDINALLY FROM THE LATTER TOWARD THE OPPOSITE END OF THE BODY, A FLAT SURFACE ON THE BOTTOM OF SAID BASE EXTENDING RADIALLY OUTWARD FROM SAID BORE AND BEING NORMAL TO THE AXIS OF SAID BORE, A THIN WALLED SKIRT EXTENDING DOWNWARDLY FROM SAID BASE AND TAPERED OUTWARDLY FOR SEALING AGAINST A MEMBER SECURED BETWEEN SAID BASE AND THE HEAD OF THE STUD, AN INTERIOR CYLINDRICAL WALL IN SAID BASE FORMING A PORTION OF SAID BORE AND HAVING A DIAMETER LARGER THAN SAID MAJOR DIAMETER AND ADAPTED TO GUIDE SAID STUD UPWARDLY THROUGH SAID BASE AND INTO SAID BORE, A METAL MEMBER EMBEDDED IN THE CENTRAL PORTION OF THE NUT BODY, A THREAD ENGAGING PART IN SAID METAL MEMBER PROJECTING GENERALLY TOWARDS THE AXIS OF THE BORE, SAID METAL MEMBER HAVING AXIALLY EXTENDING GROOVES IN SAID METAL MEMBER INTERRUPTING THE THREAD ENGAGING PART, AN INTERIOR ANNULAR WALL IN SAID DOME OF A DIAMETER LESS THAN THE MAJOR DIAMETER OF THE STUD TO JAM ON A STUD THREADED THROUGH SAID METAL MEMBER AND INTO SAID DOME, AND A THIN WALLED WEB DEFINING THE MINIMUM CROSS-SECTIONAL AREA OF SAID BODY AND FORMED INTEGRALLY BETWEEN SAID BASE AND SAID CENTRAL PORTION OF THE BODY CARRYING SAID METAL MEMBER FOR RUPTURING TO DISCONNECTED SAID BASE FROM THIS PORTION WHEREBY SAID BASE AND SKIRT FUNCTION AS A WASHER FOR THE RELATIVELY ROTATABLE CENTRAL PORTION OF THE NUT CONTAINING THE METAL MEMBER.