Electromagnetic effect protective fastener with swageable termination body

A fastener assembly for protection against electromagnetic effects, the fastener assembly comprising:

• a fastener formed of a metallic material and having a head, a shank, and a threaded portion opposite the head;
• a termination part formed of a metallic core coated by a layer of dielectric material, the termination part including:
• an internal bore extending through the termination part along a longitudinal axis from a proximal end of the termination part, positioned nearer the head of the fastener, to a distal end of the termination part, positioned opposite the proximal end, the internal bore including an inner wall extending from the distal end, a counterbore hole extending from the proximal end, and an annular cavity disposed between the inner wall and the counterbore hole;
• and
• an outer surface including an outer wall extending from the distal end, and a frustoconical wall positioned proximally relative to the outer wall, the frustoconical wall extending radially outwardly from the outer wall and having an included angle of less than approximately 90 degrees;
• and
• a seal disposed in the counterbore hole;
• wherein the frustoconical wall is configured so that a compressive force applied to the frustoconical wall deforms the inner wall to conform to the threaded portion of the fastener and deforms the seal to fill the cavity.

A method of fastening a structural assembly to suppress electromagnetic effects, the method comprising:

• providing a fastener formed of a metallic material and having a head, a shank, and a threaded portion opposite the head;
• providing a termination part formed of a metallic core coated by a layer of dielectric material, the termination part including:
• an internal bore extending through the termination part along a longitudinal axis from a proximal end of the termination part, positioned nearer the head of the fastener, to a distal end of the termination part, positioned opposite the proximal end, the internal bore including an inner wall extending from the distal end, a counterbore hole extending from the proximal end, and an annular cavity disposed between the inner wall and the counterbore hole;
• and
• an outer surface including an outer wall extending from the distal end, and a frustoconical wall positioned proximally relative to the outer wall, the frustoconical wall extending radially outwardly from the outer wall and having an included angle of less than approximately 90 degrees;
• providing a seal disposed in the counterbore hole;
• positioning the termination part over the fastener so that the inner wall of the internal bore of the termination part overlies the threaded portion of the fastener;
• and
• applying compressive force to the frustoconical wall formed in the outer surface of the termination part until the inner wall deforms radially inwardly to conform to and mechanically interlock with the threaded portion of the fastener.