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 concentric with the longitudinal axis; 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 only in the counterbore hole prior to an application of a compressive force; characterized in that 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 to protect against EME generating between the proximal end of the termination part and the fastener. 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 concentric with the longitudinal axis; 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 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 concentric with the longitudinal axis; 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 only in the counterbore hole prior to an application of a compressive force; characterized in that 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 to protect against EME generating between the proximal end of the termination part and the fastener.