| Abstract: | A tamper-resistant threaded fastener including a circular head having a
slot formed in the head transverse to the longitudinal axis, the slot
having an enlarged region intermediate an apex and a base of the slot. A
cap member includes a head having a drive feature formed therein, the
head extending to a first shank portion, extending to an enlarged second
shank portion, extending to a foot. The cap member is insertable in the
slot only from a direction transverse to the longitudinal axis. During
rotational installation of the fastener and cap member in a threaded
counterbored opening for securing a barrier for protecting an asset, the
foot shears inside the slot at a predetermined rotational drive force,
the cap member being rotatable in the opening and protectively covering
the fastener head. |