Sleeved fastener assembly
First Claim
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1. A method of preparing a conductive sleeved fastening system for use, comprising:
- providing a fastener having a fastener head, a fastener shank extending from said fastener head, and a fastener sleeve provided on said fastener shank and a fastener sleeve flare on said fastener sleeve;
preparing a nut configured to attach to the fastener shank, by forming a counterbore therein, the counterbore extending from a top surface of the nut and having;
a counterbore diameter sized to maintain a radial gap between an inward-facing surface of the counterbore and an outer surface of the fastener sleeve; and
a counterbore depth sized to maintain an axial gap between a distal end of the fastener sleeve and a bottom surface of the counterbore; and
forming a fillet between the inward-facing surface and the bottom surface of the counterbore.
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Abstract
A conductive fastener assembly, system, and method are described. The fastener assembly includes a nut having a counterbore formed therein. The counterbore is formed to maintain a sufficient gap between the nut and the protruding end of a fastener sleeve. The nut with the counterbore improves the conductive fastener system such that the need for a solid copper grid and a cap seal is reduced or eliminated.
41 Citations
17 Claims
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1. A method of preparing a conductive sleeved fastening system for use, comprising:
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providing a fastener having a fastener head, a fastener shank extending from said fastener head, and a fastener sleeve provided on said fastener shank and a fastener sleeve flare on said fastener sleeve; preparing a nut configured to attach to the fastener shank, by forming a counterbore therein, the counterbore extending from a top surface of the nut and having; a counterbore diameter sized to maintain a radial gap between an inward-facing surface of the counterbore and an outer surface of the fastener sleeve; and a counterbore depth sized to maintain an axial gap between a distal end of the fastener sleeve and a bottom surface of the counterbore; and forming a fillet between the inward-facing surface and the bottom surface of the counterbore. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method comprising:
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providing a fastener having a fastener head, a fastener shank extending from said fastener head, and a fastener sleeve provided on said fastener shank and a fastener sleeve flare on said fastener sleeve; preparing a nut configured to attach to the fastener shank, by forming a counterbore therein, the counterbore extending from a top surface of the nut and having; a counterbore diameter sized to maintain a radial gap between an inward-facing surface of the counterbore and an outer surface of the fastener sleeve; and a counterbore depth sized to maintain an axial gap between a distal end of the fastener sleeve and a bottom surface of the counterbore; forming a fillet between the inward-facing surface and the bottom surface of the counterbore; and arranging a fay seal on a surface of at least one of two structures to be fastened together, the two structures having aligned holes therein, wherein the fay seal is omitted from an area surrounding the holes. - View Dependent Claims (11, 12)
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13. A method comprising:
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forming a fastener having a fastener head and a fastener shank extending from the fastener head; arranging a fastener sleeve on the fastener shank; forming a counterbore within a nut, the counterbore extending from a top surface of the nut, wherein a radius of the counterbore is sized to maintain a radial gap between an inward-facing surface of the counterbore and an outer surface of the fastener sleeve, and wherein a depth of the counterbore is sized to maintain an axial gap between a distal end of the fastener sleeve and a bottom surface of the counterbore; forming a fillet between the inward-facing surface and the bottom surface of the counterbore; and arranging a fay seal on a surface of at least one of two structures to be fastened together, wherein the two structures have aligned holes defined therein, and wherein the fay seal is omitted from an area surrounding the holes. - View Dependent Claims (14, 15, 16, 17)
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Specification