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Tamper-resistant fastener

United States Patent

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April 6, 2021
View the Complete Patent at the US Patent & Trademark Office
Tamper-Resistant Fastener
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.
16/ 166,463
October 22, 2018
F16B 23/00 (20060101)F16B 35/04 (20060101)F16B 31/02 (20060101)F16B 5/02 (20060101)F16B 41/00 (20060101)F16B 37/04 (20060101)
GOVERNMENT INTEREST STATEMENT This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The U.S. Government has certain rights in this invention.